Click Here -> Please Consider Making a PayPal Contribution to the FordSix Forum!
2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40,
mustang6, WorldChampGramp, justintendo, BigBlue94, ags290, motorsickle1130, Rooster, ousooner919, ethanperry
rzcrisis, DoctorC, jamyers, Motorboy, fastpat, Silverback280, chad


<<< New Site Update >>>

Search found 121 matches

by jason832
Fri Oct 05, 2018 8:48 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Engine temps are still going higher than I would like.
Replies: 19
Views: 1546

Re: Engine temps are still going higher than I would like.

I have built 300, maybe 2 row small aluminum radiator, clutch fan, and no shroud with a fair gap between fan and rad. I have no issues. Maybe its running very lean? Air stuck somewhere in the system? Blocked passages? Weak clutch on the fan? Bent fan blades? Possibly you installed the wrong water pu...
by jason832
Fri Sep 21, 2018 10:17 am
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 483
Views: 61686

Re: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress

Keep up the excellent work gramps. Any updates on when the first head will be dyno'd or available for order etc? Many of us are patiently waiting to finally make some power out of our sixes and we greatly appreciate the work. If I can make the suggestion a Facebook page or something is started so we...
by jason832
Fri Sep 21, 2018 8:45 am
Forum: 240-300 "Big Block" Six Performance
Topic: opinions please on con rod bolts
Replies: 5
Views: 754

Re: opinions please on con rod bolts

Changing them means getting the machine shop to resize the rods as well. For a street engine that doesn't see more than 5000rpm I'd keep the factory ones. I did on mine (4bbl, intake, cam, hyper pistons, headers) and have been pulling to to 5k many many tomes a day for over a year. French town flyer...
by jason832
Thu Sep 20, 2018 6:23 pm
Forum: 240-300 "Big Block" Six Performance
Topic: My bad starter adventure
Replies: 7
Views: 1070

Re: My bad starter adventure

Cliffords shorty headers can be made to clear starters that way you can change the starter. Will be my choice for headers if I buy more. I've encountered both small and large case starters and both can be changed easily. The large case starter however the power wire must be angled to avoid the exhau...
by jason832
Fri Sep 14, 2018 9:10 am
Forum: 240-300 "Big Block" Six Performance
Topic: FiTech (or other FI systems) used with boost.
Replies: 34
Views: 2949

Re: FiTech (or other FI systems) used with boost.

If I remember correctly the fitech systems can handle more power than the rating says. Its just rated a bit on the low side. The 400hp can do 500 or something like that and so on for the rest.
by jason832
Tue Aug 21, 2018 7:59 am
Forum: 240-300 "Big Block" Six Performance
Topic: Wiped cam.
Replies: 41
Views: 4202

Re: Wiped cam.

The comp can you ordered pulls good from 1000 to 4500 or so if your head has been worked over well. I'm running mine without roller rockers. Just screw in studs and I believe they are the comp flat tip ball rockers. They've held up for a few years perfect and did well with the Clifford can at .474 l...
by jason832
Tue Jul 31, 2018 11:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Pulling Cam & Crank Gears
Replies: 13
Views: 1678

Re: Pulling Cam & Crank Gears

Im guessing the engine is still in the truck? Bear with me I'm extremely behind on sleep and may miss details... The crank gear requires a lot of force in my experience to pull off. Have a good puller fully installed to pull it. Do not rely on hammering a new one on because you do not want to damage...
by jason832
Fri Jul 27, 2018 7:53 am
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 483
Views: 61686

Re: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress

Keep up the good work. Can't wait to see then next u head and get my hands on one.
by jason832
Tue Jul 17, 2018 10:34 am
Forum: 240-300 "Big Block" Six Performance
Topic: Alternator requirements
Replies: 17
Views: 2086

Re: Alternator requirements

The ignition itself will pull very little at idle and can run on fairly low voltage.

Look up a 3g alternator swap. They're cheap and can be had in 130 amp versions. Everything can be found in a junkyard for like 30$
by jason832
Mon Jul 16, 2018 6:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 483
Views: 61686

Re: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress

I'm pretty sure I'm in for the Max u head. Need to get it to Canada though...
by jason832
Wed Jul 11, 2018 10:39 am
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent Flow Fix IDEAS Welcomed
Replies: 15
Views: 1974

Re: Permanent Flow Fix IDEAS Welcomed

Excellent work. Can't wait to wake up my six. Looks like I won't be building a 460 for my truck when the Max flow or cross flow head comes out.
by jason832
Tue Jul 10, 2018 6:12 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Question about Rod and Main Bolts
Replies: 3
Views: 627

Re: Question about Rod and Main Bolts

I don't think they are torque to yield someone else should answer as well. Also if you need to change the bolts the rods would need to be resized after pressing in new ones.
by jason832
Thu Jul 05, 2018 6:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Checklist for 300 engine that was smoking
Replies: 6
Views: 845

Re: Checklist for 300 engine that was smoking

Tighten all of your coolant hoses first. Wipe down everything you think might leak so it's dry. Start it for a few seconds and have a look.
by jason832
Sun Jul 01, 2018 8:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Lifter kit recomendation
Replies: 9
Views: 1060

Re: Lifter kit recomendation

Doesn't sealed or someone make a stock replacement for less than an aftermarket cam on summit? Don't put a 268 on an engine that doesn't have a carb intake and exhaust at a minimum. I have that cam and its for a moderate and up build. Maybe buy a mild comp can like mentioned above, comp lifter and t...
by jason832
Fri Jun 22, 2018 11:23 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Hydraulic Lifter Brand
Replies: 6
Views: 975

Re: Hydraulic Lifter Brand

I've used a few sets of comp lifters on comp cams, however not more than a year or two on each set before switching. They all broke in fine on shell diesel oil without any issues. I also ran a temporary high milage 200$ engine while building a nice one, and it developed a tick. I installed a set of ...
by jason832
Mon Jun 18, 2018 7:32 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Quick valvetrain question.
Replies: 16
Views: 2002

Re: Quick valvetrain question.

While apart valve guides should be checked for slop. If they are worn no amount of lapping will fix them for long... If you disassemble it yourself I recommend a valve spring compressor that holds the valve on the chamber end, and compresses the spring. Don't waste your time with the ones that grab ...
by jason832
Mon Jun 18, 2018 7:26 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Quick valvetrain question.
Replies: 16
Views: 2002

Re: Quick valvetrain question.

Roller rockers have round tips meaning all the force is on one spot of the valve tip compared to stock rockers where the flatness of the rocker tip spreads it out more. This means that a roller rocker is more sensitive to pushrod lengths, according to an episode of power nation anyway. The scorpion ...
by jason832
Mon Jun 18, 2018 11:53 am
Forum: 240-300 "Big Block" Six Performance
Topic: Quick valvetrain question.
Replies: 16
Views: 2002

Re: Quick valvetrain question.

If you have bad compression on a cylinder just start with pulling the head since no matter what you will need to. If its a ring problem you should see a ridge at the top or scratches on the cylinder. You can verify the valve isn't sealing by installing the plugs, filling the chambers with water and ...
by jason832
Sun Jun 17, 2018 1:50 pm
Forum: 240-300 "Big Block" Six Performance
Topic: My 1983 300 has a mysterious tick!
Replies: 13
Views: 1684

Re: My 1983 300 has a mysterious tick!

A new cam requires new lifters, new lifters can be used on an old cam. Also if you remove old ones and they are to be reinstalled, they must go back to the same hole. You can pull all the old lifters and install new ones in one go. I just wouldn't remove or tighten the rocker arms unless the cylinde...
by jason832
Sun Jun 17, 2018 9:42 am
Forum: 240-300 "Big Block" Six Performance
Topic: My 1983 300 has a mysterious tick!
Replies: 13
Views: 1684

Re: My 1983 300 has a mysterious tick!

Compression is probably fine 160+ is pretty good. With a lot of milage the lifters might start to tick. I had a high milage 300 that ticked, put a set of summit brand lifters and all was well. If you plan on putting a ton more milage on it I'd consider new lifters. Pull the rockers, pushrods, distri...
by jason832
Thu Jun 14, 2018 4:17 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 100k 4.9 freshen up advice please.
Replies: 9
Views: 1515

Re: 100k 4.9 freshen up advice please.

Stock pistons are not very strong. Its well known around here that when you open up a bottom end it has a decent chance of missing piston chunks. I have also built a mild engine (stock low milage bottom end, carb, intake and headers). Shortly after it has 40psi of compression on one cylinder. I pull...
by jason832
Thu Jun 14, 2018 12:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: My 1983 300 has a mysterious tick!
Replies: 13
Views: 1684

Re: My 1983 300 has a mysterious tick!

Its hard to hear on my phone speaker but maybe you didn't install the manifold to head gasket very well. Did you scrape and clean the two surfaces super clean before installation? If any material or carbon is left over the gasket won't seal properly. Maybe you goofed the gasket or if its the two pie...
by jason832
Tue Apr 24, 2018 11:43 am
Forum: 240-300 "Big Block" Six Performance
Topic: First Ever Engine Swap. Lots of questions. I want it right.
Replies: 6
Views: 1012

Re: First Ever Engine Swap. Lots of questions. I want it right.

I did something similar last summer. 88 engine into my 85 and I kept all the carb stuff and carb head on the efi block. 1.Check the power steering bracket. There should be spacers about one nut thick between the bracket and block. Make sure thee two pulleys line up square. 2.Your oil pan should be f...
by jason832
Sun Apr 22, 2018 9:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: symptoms of cam gear fail?
Replies: 74
Views: 6978

Re: symptoms of cam gear fail?

If the timing gears shear or start to fail it will probably fail suddenly I doubt it would skip a tooth and continue on its marry way for a while. The gear on the distributor and cam can strip down sometimes just on one side. You could check them visually for wear. Also just pulling the distributor ...
by jason832
Fri Apr 20, 2018 7:07 am
Forum: 240-300 "Big Block" Six Performance
Topic: What operating rpm can a 300ci. hold safely?
Replies: 25
Views: 3355

Re: What operating rpm can a 300ci. hold safely?

I spin mine many times a day to 5k, for about a year now. 4barrel and intake, cam, and aftermarket pistons. Rod main and head bolts are stock.

I think ford has the redline at 5k or 5500rpm. 3400 is fine. I think peak torque on a stock 300 will be at less rpm though.
by jason832
Sat Apr 14, 2018 10:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 600 cfm holley
Replies: 20
Views: 2989

Re: 600 cfm holley

An off C manifold I doubt will cause the issues OP is having. I've ran a Clifford intake without the heat passages hooked up, Clifford cam and a 4 barrel street demon Jr. In the coldest times of Canadian winter and it ran fine and pulled as good as a stock 300 down low. Is the choke working right? A...
by jason832
Wed Apr 04, 2018 9:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Removing harmonic balancer
Replies: 5
Views: 1007

Re: Removing harmonic balancer

If its a manual put it in high gear. If its like the 300 you'll need the puller with 3 outside bolts, be sure those 3 bolts are in fully or you risk stripping it, believe me. I think I have been able to get the balancer off with the radiator on but it was close, and it was an 85 f150 so not the same...
by jason832
Wed Apr 04, 2018 2:34 pm
Forum: 240-300 "Big Block" Six Performance
Topic: School me on Pistons
Replies: 4
Views: 992

Re: School me on Pistons

My 300 has that exact cam and pistons. Carbed head milled 0.060 by PO, 1024 Head gasket, stock bore and block not milled. It diesels most times when I shut it off at full temp on 87 octane. 91 octane runs a bit smoother and lowers the dieseling. Not sure what my timing is at but it is set far enough...
by jason832
Sat Mar 10, 2018 3:31 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Low-End Torque Upgrades
Replies: 49
Views: 4876

Re: Low-End Torque Upgrades

I have a quite built 300, 4 inch lift, 35 inch tires, 3.55 gears, 8.8 rear and Aussie locker up front. I installed new top of the line non greasable u joints on the Dana 44 shafts and only use good u joints on the driveshafts. I've ran this setup for almost 3 years daily. The junkyard wheel bearings...
by jason832
Sun Feb 25, 2018 12:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 483
Views: 61686

Re: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress

If someone finally made an aluminium head for the 300 it would sell quite well. I'd be ordering one or two once I see it.

I'd also like to see someone maximize the cfm of the factory heads and post a guide on how to port them.
by jason832
Fri Jan 26, 2018 11:24 pm
Forum: 240-300 "Big Block" Six Performance
Topic: My 300 Inline 6 Sounds Like a Diesel !!!...HELP
Replies: 16
Views: 2389

Re: My 300 Inline 6 Sounds Like a Diesel !!!...HELP

Did you check your bell housing bolts.... Assuming its a manual does the clutch pedal make a difference in or out? I have a memory of something like this happening to me. Or while sitting over the years something found a way into a cylinder and broke something, unlikely but possible. Compression tes...
by jason832
Thu Jan 25, 2018 11:17 pm
Forum: 240-300 "Big Block" Six Performance
Topic: My 300 Inline 6 Sounds Like a Diesel !!!...HELP
Replies: 16
Views: 2389

Re: My 300 Inline 6 Sounds Like a Diesel !!!...HELP

The rockers are bolt down on this engine right? I don't know if they should have side to side play. Stud mount ones may have a bit. Does it literally come to a screeeeeeching halt? If oil reaches the top the pump is pumping it. The factory guage/sensor/wiring may be bad from age. Firing order correc...
by jason832
Thu Jan 18, 2018 8:15 pm
Forum: 240-300 "Big Block" Six Performance
Topic: What's your experience with the Comp Cams 260H Camshaft?
Replies: 9
Views: 1491

Re: What's your experience with the Comp Cams 260H Camshaft?

I have a very close build to yours. Same pistons, felpro 1024 head gasket, carbed head milled .060, comp 268 cam. If my math was correct I have 8.8 static and 7.32 dynamic. I run it on 87 octane, but sometimes it diesels on after turning the key off leading to believe I need premium gas.... My timin...
by jason832
Fri Dec 15, 2017 8:51 am
Forum: 240-300 "Big Block" Six Performance
Topic: Finding the right scale.
Replies: 17
Views: 1964

Re: Finding the right scale.

I bought h519p stock bore pistons a few months ago. They came in one box labeled as weight matched already. If you decide to go with ARP rod bolts have the rods resized after the bolts are put in. If using ARP main studs you'll probably want the mains honed as well.
by jason832
Tue Nov 07, 2017 8:36 am
Forum: 240-300 "Big Block" Six Performance
Topic: Crane 500511 or 503901
Replies: 35
Views: 5545

Re: Crane 500511 or 503901

I somewhat built the original 85, family inherited 300 in my truck. Stock never opened bottom end and it had about 120k KM. Only modifications were a 4 barrel, Clifford intake, and headers. Within a few months it lost most compression in one of the cylinders. That bottom end sits on my garage floor ...
by jason832
Fri Nov 03, 2017 11:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Upper Radiator Hose Cast Fitting For 300 4.9L Inline Six
Replies: 10
Views: 2090

Re: Upper Radiator Hose Cast Fitting For 300 4.9L Inline Six

I've bought two from summit. The first broke the first install it was very cheap. The second I've pulled and installed several times and has done me well. I believe this is the link to the better one I've had (im looking through my order history) https://www.summitracing.com/parts/fss-84976
by jason832
Fri Nov 03, 2017 10:55 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Upper Radiator Hose Cast Fitting For 300 4.9L Inline Six
Replies: 10
Views: 2090

Re: Upper Radiator Hose Cast Fitting For 300 4.9L Inline Six

If you are referring to the water neck the top hose connects to, I've bought two aftermarket ones from summit. Both are cheap "white metal" or "powder metal" or whatever. They will break very easy if tightened down too much. Snug with two or three fingers on a ratchet will do fin...
by jason832
Tue Oct 31, 2017 8:15 am
Forum: 240-300 "Big Block" Six Performance
Topic: Crane 500511 or 503901
Replies: 35
Views: 5545

Re: Crane 500511 or 503901

I plan on building a motor with a stock bottom end A solid 200hp/300lbft in the 1,000 - 4,500 rpm range Long live the 300 six! I doubt it will live that long with stock pistons. Pistons can be replaced easily. As long as the six of them are weight matched you don't have any balancing issues. Lighte...
by jason832
Sat Oct 28, 2017 12:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Towing specs? (GCWR)
Replies: 3
Views: 1003

Re: Towing specs? (GCWR)

I don't think the truck came with the GCWR in the door. Just the GVWR and the individual axle ratings. Anyway if the trucks been modified quite a not then I wouldn't bother with factory ratings. Your Mazda trans is what will limit your towing because of 2 things. 1. Its a light duty trans, 2. Your c...
by jason832
Sat Oct 28, 2017 12:00 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Towing specs? (GCWR)
Replies: 3
Views: 1003

Re: Towing specs? (GCWR)

I can't get the chart to upload but the OBE I have saved says for the 300 and a manual trans: GCWR: 3.08 9000lb 3.55 10000lb 4.10 11000lb The 300 will tow a lot but a 2.73 gear and Mazda trans will limit you because it will be hard to get moving and the rpms may be too low for the motor to pull in d...
by jason832
Thu Oct 26, 2017 12:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Crane 500511 or 503901
Replies: 35
Views: 5545

Re: Crane 500511 or 503901

My 85 has 3.55 gears and 35 inch tires, and a np435. It already turns over 2000rpm on the highway, more than enough. The np435 has enough gearing to get you going fine. With factory efi I don't know what the computer will tolerate or how much power the stock everything else can even support. Google ...
by jason832
Mon Oct 16, 2017 12:10 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Parts for 300 build
Replies: 3
Views: 1067

Re: Parts for 300 build

You can pull the head, cam, and lifters and inspect them for damage. If they are all fine then id reuse them. The lifters must stay in order 1-12 note which holes the come out of. You can always put new lifters on the old 268 cam. For rockers I'd say get screw in studs installed and just use comp ca...
by jason832
Sun Oct 15, 2017 11:15 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Strapped main caps
Replies: 13
Views: 2459

Re: Strapped main caps

What is a strapped main cap?...
by jason832
Sat Oct 07, 2017 4:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Intake and exhaust gaskets on a 300 six
Replies: 7
Views: 1247

Re: Intake and exhaust gaskets on a 300 six

I just had a Mr gasket 260 sent to my house about 2 weeks ago from summit. (I had 3 v8s sent to me months ago, they went out of stock for a while and now the right ones are back)
by jason832
Fri Oct 06, 2017 3:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Intake and exhaust gaskets on a 300 six
Replies: 7
Views: 1247

Re: Intake and exhaust gaskets on a 300 six

Mr. Gasket 260 is good. I don't like the felpro cause that paper intake gasket is super easy to rip.
by jason832
Fri Sep 29, 2017 11:32 am
Forum: 240-300 "Big Block" Six Performance
Topic: Crankshaft main bearing cap bolts?
Replies: 33
Views: 4734

Re: Crankshaft main bearing cap bolts?

I agree reusing the old ones. I reused mine for my high performance build. These motors have 7 mains I can't imagine them breaking easily. I can check my ford engine shop manual if you want to see if it mentions replacing them. Here's the list of torque values for the 300 in case you want them for y...
by jason832
Thu Sep 28, 2017 8:30 am
Forum: 240-300 "Big Block" Six Performance
Topic: Crankshaft main bearing cap bolts?
Replies: 33
Views: 4734

Re: Crankshaft main bearing cap bolts?

If you switch to studs, you may want the mains align honed at a shop.
by jason832
Fri Sep 22, 2017 6:09 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Hotrod 300
Replies: 7
Views: 3446

Re: Hotrod 300

Welcome to ford six. A few notes on the 300: No aftermarket heads, cranks or rods are available for the 300. The stock crank and rods will take a lot of punishment. The stock pistons are junk, any performance build should have replacements, I learned that the hard way. The iron heads ford produced f...
by jason832
Tue Sep 19, 2017 9:08 am
Forum: 240-300 "Big Block" Six Performance
Topic: Overheating 300
Replies: 4
Views: 1258

Re: Overheating 300

Look and see how dirty the coolant is. I think most parts stores sell bottles of "rad flush" or "coolant flush' or whatever. Maybe try dumping one of them in, run it for a bit, empty and fill it a few times with water to flush it all out then refill with antifreeze. Always pull the ra...
by jason832
Thu Sep 14, 2017 10:19 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Head bolt broke!
Replies: 15
Views: 2516

Re: Head bolt broke!

I might be late to the thread, but this may be useful for you. It is from my ford 85 light truck engine shop manual. I've used stock bolts several times, clean the threads out, put motor oil on them and torque it down. Never had a problem. If they've been used several times already I'd look into new...