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Search found 253 matches

by GPGoverMPG
Mon Jun 25, 2018 8:15 am
Forum: 240-300 "Big Block" Six Performance
Topic: Intake manifold build
Replies: 17
Views: 3422

Re: Intake manifold build

Right on the cam. I was taking notes and got it screwed up. I think the Crane 500211 is what i was looking at. However, now i'm thinking solid lifters. I have started to lean towards splitting the intake to match the EFI exhaust. Keep the plenums seperated and fab the linkage so I can syncronize the...
by GPGoverMPG
Sat Jun 23, 2018 9:07 am
Forum: 240-300 "Big Block" Six Performance
Topic: Intake manifold build
Replies: 17
Views: 3422

Re: Intake manifold build

That tubester is cool looking. All that work and no performance gain. I built wheel well headers for a '41 willys running an 871 BDS on a 440 mopar. Dumped right behind front wheels used a collector so he could slide a removable racing baffel in. Man it sounds cool.
by GPGoverMPG
Fri Jun 22, 2018 3:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Intake manifold build
Replies: 17
Views: 3422

Re: Intake manifold build

No EFI intake. Going to go full tubular like a header. That's how I could set the intakes up by firing order. 1,5,3 on one carb and 6,2,4 on for the other one. Looks like 1.5" tube 16" long if I would go ahead and build the headers the same way I think it would scavenge great. Not real sur...
by GPGoverMPG
Fri Jun 22, 2018 9:13 am
Forum: 240-300 "Big Block" Six Performance
Topic: Intake manifold build
Replies: 17
Views: 3422

Intake manifold build

I'm currently using the automotive calculators at Wallace Racing http://wallaceracing.com/Calculators.htm to design an intake manifold for the new motor I'm building. I just picked up a pair of 2100 series carbs form a 1970 302 ford truck they are not in my hands yet so I can't verify CFM size. So f...
by GPGoverMPG
Wed Jun 06, 2018 8:46 am
Forum: 240-300 "Big Block" Six Performance
Topic: Carbon Sludge in Intake Port @ Fuel Injector
Replies: 30
Views: 5593

Re: Carbon Sludge in Intake Port @ Fuel Injector

There is a GDI (gasoline direct injected) valve cleaning kit available. Seems GDI engines have a problem with this since the fuel is not being sprayed on the back of intake valves. I have used this kit from Valvoline on my 3.5L boosted SHO and it made a big difference in driveability. It mists into ...
by GPGoverMPG
Wed Jun 06, 2018 7:09 am
Forum: 240-300 "Big Block" Six Performance
Topic: Adjusting vacuum advance for driving selected MPH
Replies: 6
Views: 1687

Re: Adjusting vacuum advance for driving selected MPH

I run about 12 miles to my shop and back each day on a frontage road here in south Texas. I was wondering if there was some way I could use this time to fiddle with my truck. I'm building a new motor and the things I'm learning messing with the old one can be applied to making the new one run it's b...
by GPGoverMPG
Sun Jun 03, 2018 11:36 am
Forum: 240-300 "Big Block" Six Performance
Topic: Adjusting vacuum advance for driving selected MPH
Replies: 6
Views: 1687

Re: Adjusting vacuum advance for driving selected MPH

Been gone for a while dealing with medical stuff. So here's my real questions (had time to think not test). I can use my advance timing light and my dwell tach to find my distributors mechanical advance curve. I can use two vacuum gauges to find ported and manifold vacuum levels at a specific cruise...
by GPGoverMPG
Sat Apr 21, 2018 5:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Adjusting vacuum advance for driving selected MPH
Replies: 6
Views: 1687

Adjusting vacuum advance for driving selected MPH

Now that the way vacuum advance works has been explained to me and tested my truck runs great at WOT. I drive on frontage roads down here in south Texas at about 55mph (1750rpm). If you drive with a vacuum gauge is there a way you could play with vacuum advance to maximize vacuum on a given road. Yo...
by GPGoverMPG
Fri Apr 20, 2018 7:00 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Distributor timing adjustments
Replies: 12
Views: 2230

Re: Distributor timing adjustments

Yes, but not really. I didn't bother putting numbers on here because it will be different for everyone. It's not very black and white I still need to play with my vacuum advance stop. So on my truck mechanical advance starts at 700rpm and it's all in at 2500rpm that's 18*. So at 1500rpm partial thro...
by GPGoverMPG
Fri Apr 20, 2018 4:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Distributor timing adjustments
Replies: 12
Views: 2230

Re: Distributor timing adjustments

So, first off all my assumptions were wrong. At idle manifold vacuum is high, ported vacuum is low. Partial throttle manifold vacuum is less and ported vacuum is high, At full throttle manifold vacuum is low and ported vacuum is low. So Frenchtownflyer is correct again. Thank you very much. I have n...
by GPGoverMPG
Thu Apr 19, 2018 6:09 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Distributor timing adjustments
Replies: 12
Views: 2230

Re: Distributor timing adjustments

I've used a piston stop and verified top dead center. The balancer is fine. i will connect a vacuum gauge with a tee in the line going to the vacuum advance from the carbs ported vacuum outlet and drive the truck. Under full throttle i'll monitor the ported vacuum. My base assumptions are as follows...
by GPGoverMPG
Thu Apr 19, 2018 8:05 am
Forum: 240-300 "Big Block" Six Performance
Topic: Distributor timing adjustments
Replies: 12
Views: 2230

Re: Distributor timing adjustments

No EGR. Really simple set up. The timing light is indicating 46* total timing at about 2500rpm. I think it should be around 36*. I'm going to try adjusting the vacuum advance today and see if I can remove 10*.
by GPGoverMPG
Wed Apr 18, 2018 8:16 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Distributor timing adjustments
Replies: 12
Views: 2230

Re: Distributor timing adjustments

So I'm using ported vacuum for the distributor vacuum advance. Ported vacuum increases with throttle opening so there would be times when you see both mechanical and vacuum advance at their max. Or do I have something wrong here?
by GPGoverMPG
Wed Apr 18, 2018 8:01 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Distributor timing adjustments
Replies: 12
Views: 2230

Re: Distributor timing adjustments

When checking timing at 2500rpm I get 46*. Seems like I should only see about 36*. Where do I fix this? I'm using an MAC tool timing light with the timing dial on it to check this. Thanks
by GPGoverMPG
Wed Apr 18, 2018 2:47 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Distributor timing adjustments
Replies: 12
Views: 2230

Distributor timing adjustments

So I'm working on the motor still in my 1979 4x4 4speed truck. It runs good but I don't like the low oil pressure at idle so I'm building my replacement. It's mostly stock the only changes being EFI exhaust (no muffler-way to loud), Chevy rockers, and a 2v carb off a 1964 289 mustang. I have way to ...
by GPGoverMPG
Wed Mar 21, 2018 7:36 am
Forum: 240-300 "Big Block" Six Performance
Topic: Exhaust port question.
Replies: 18
Views: 3844

Re: Exhaust port question.

So I've decided to modify one of my old iron intakes to accept my big 2v carb. I cutting open the center plenum and installing two pieces of 1.75" exhaust tubing up to a carb mounting plate made from .25" steel. I think I can split the air front to back like the EFI exhaust manifolds. I ca...
by GPGoverMPG
Tue Mar 20, 2018 7:41 am
Forum: 240-300 "Big Block" Six Performance
Topic: 240 dies under load idles rough
Replies: 30
Views: 5889

Re: 240 dies under load idles rough

I'm currently running duraspark if it breaks you can get replacement parts easy. I run the pertronix stuff in other cars it also works super well.
by GPGoverMPG
Tue Mar 20, 2018 7:36 am
Forum: 240-300 "Big Block" Six Performance
Topic: Exhaust port question.
Replies: 18
Views: 3844

Re: Exhaust port question.

I'll just clean them up and not worry about it. Didn't know if there was something to be had or not. I am going to try the TIG brazing thing on something seems like a neat idea.
by GPGoverMPG
Sun Mar 18, 2018 9:53 am
Forum: 240-300 "Big Block" Six Performance
Topic: Exhaust port question.
Replies: 18
Views: 3844

Re: Exhaust port question.

I have not attempted brazing with my TIG set up. I think I will need to try this. I have an old 7.3 IDI diesel and I wanted to modify the intake so it had 8 individual stacks because it would look cool. It may also be a good way to modify the stock iron intake to accept a 4v carb. Don't think I coul...
by GPGoverMPG
Sun Mar 18, 2018 7:41 am
Forum: 240-300 "Big Block" Six Performance
Topic: Exhaust port question.
Replies: 18
Views: 3844

Exhaust port question.

So I'm roughing in port shapes. It's an '82 head and there are two depressions in the roof of the exhaust ports. Seems like too much to just hog out. Is there something being used to fill these kind of things. With laminar air flow and hot exhaust it seems like it would create unnecessary hot spots....
by GPGoverMPG
Sun Mar 11, 2018 11:55 am
Forum: 240-300 "Big Block" Six Performance
Topic: Deck the block or offset grind?
Replies: 4
Views: 1215

Re: Deck the block or offset grind?

First your math is better than mine so thanks. Forgetting to split the rod journal gains. Still if I go .020 under on the rod journals or maybe .030 I still would have less to remove from the block to get zero deck and have the minor gains in swept area. I am not going to be reving over 5200 RPM and...
by GPGoverMPG
Sun Mar 11, 2018 9:46 am
Forum: 240-300 "Big Block" Six Performance
Topic: 240 dies under load idles rough
Replies: 30
Views: 5889

Re: 240 dies under load idles rough

Local library, my local one has lots of maintenance manuals people have donated after selling there rides. (I know, print is dead)
by GPGoverMPG
Sun Mar 11, 2018 9:32 am
Forum: 240-300 "Big Block" Six Performance
Topic: DIY muffler?
Replies: 19
Views: 3241

Re: DIY muffler?

Good luck posting a sound bite to this site. If you figure it out let me know because I gave up. (not much effort) It would be neat to have a topic with all the different exhaust configurations and sounds.
by GPGoverMPG
Sun Mar 11, 2018 9:23 am
Forum: 240-300 "Big Block" Six Performance
Topic: Deck the block or offset grind?
Replies: 4
Views: 1215

Deck the block or offset grind?

The 1186H pistons have the greatest compression height coming up short of zero deck by about .012. So the question is, since I will need to get the crank ground anyways, do I have the rod journals offset ground the .012 or have the block decked? The offset grind will increase the swept area giving m...
by GPGoverMPG
Wed Feb 21, 2018 3:09 pm
Forum: 240-300 "Big Block" Six Performance
Topic: KB pistons S1147 flat tops?
Replies: 16
Views: 3003

Re: KB pistons S1147 flat tops?

The KB 1186H with a .015 block deck (maybe not even that much) should leave me with a touch of positive deck height that the head gasket should cover. Unshroud the valves and cut the head .020 should leave me with enough compression the run the Crane 500211 cam. Screw in studs, a full port job, and ...
by GPGoverMPG
Tue Feb 20, 2018 7:04 am
Forum: 240-300 "Big Block" Six Performance
Topic: KB pistons S1147 flat tops?
Replies: 16
Views: 3003

Re: KB pistons S1147 flat tops?

Yea, i'd like to know what you did. I already plan on porting the head and balancing everything to with in an inch of it's life. Time exceeds cash flow by quite a bit so not in a hurry. I'd like to find a camshaft that provides good power to about 5000rpm and a rough idle. If I find a cheap enough i...
by GPGoverMPG
Sun Feb 18, 2018 4:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: KB pistons S1147 flat tops?
Replies: 16
Views: 3003

Re: KB pistons S1147 flat tops?

Just picked up motor from 1982 F150. Going to build a 1972 F100 using '79 F250 drive train and suspension. 4 speed 4X4, 4:10 gears, and 33X12.50X15s. Going to play in the mud some but mostly just drive it some. All ready running EFI exhaust, 2100 series 2v, chevy rockers. Just want to build somethin...
by GPGoverMPG
Sun Feb 18, 2018 2:18 pm
Forum: 240-300 "Big Block" Six Performance
Topic: KB pistons S1147 flat tops?
Replies: 16
Views: 3003

Re: KB pistons S1147 flat tops?

Just makes ya wounder what their dyno numbers would have been if they got it right. I will say that peak dyno numbers don't guarantee a good motor for your application. KB did list a piston set with a smallish offset dish that I'm interested in. Need to see how they compare to the H519Ps.
by GPGoverMPG
Sun Feb 18, 2018 8:47 am
Forum: 240-300 "Big Block" Six Performance
Topic: KB pistons S1147 flat tops?
Replies: 16
Views: 3003

KB pistons S1147 flat tops?

These pistons are for the 300 but they have a lower compression height. One could deck the block and mill the head but, would there be any real advantage over just using the smallest dish piston with the greater compression height? They have pistons with offset dish that should help quench. Saw thes...
by GPGoverMPG
Wed Dec 27, 2017 8:11 am
Forum: 240-300 "Big Block" Six Performance
Topic: Finding the right scale.
Replies: 17
Views: 2668

Re: Finding the right scale.

This motor is just for fun so I have time and cash to get it right, mostly time. My little short box pickup should be super fun in the mud. These 6's sound so cool spun up. My V6 twin turbo SHO does not sound nearly as good. Thanks for the info, I'll try to take plenty of pics and weight everything ...
by GPGoverMPG
Tue Dec 26, 2017 7:59 am
Forum: 240-300 "Big Block" Six Performance
Topic: Finding the right scale.
Replies: 17
Views: 2668

Re: Finding the right scale.

That 819g number is better but still seems pretty heavy. The 0-2000g scale I'm looking at should be right. Figure if I get all the weights right it should be a smooth little spiner.
by GPGoverMPG
Mon Dec 25, 2017 9:21 am
Forum: 240-300 "Big Block" Six Performance
Topic: I could really use some help plz.
Replies: 17
Views: 3900

Re: I could really use some help plz.

I bent a couple of spark plug ground electrodes in my 1979 300 motor. I was using the plugs that were listed for my engine they have a very long reach into the combustion chamber. I started running the plugs for a 1972 300 they are quite a bit shorter and I have not had the problem again. With that ...
by GPGoverMPG
Sun Dec 24, 2017 11:09 am
Forum: 240-300 "Big Block" Six Performance
Topic: Finding the right scale.
Replies: 17
Views: 2668

Re: Finding the right scale.

Test ability to post short clip. Guess they don't make it easy. crap
by GPGoverMPG
Sun Dec 24, 2017 7:31 am
Forum: 240-300 "Big Block" Six Performance
Topic: Finding the right scale.
Replies: 17
Views: 2668

Re: Finding the right scale.

I found a speedpro h519p piston weight was 1051 grams. Man that seems heavy. Still waiting to purchase scale until Christmas shipping is over getting it from amazon they seem to have best price. Wrecking yard should have my 300 pulled I just need to go get it. Weighing the rods as discribed should w...
by GPGoverMPG
Mon Dec 18, 2017 7:40 am
Forum: 240-300 "Big Block" Six Performance
Topic: Finding the right scale.
Replies: 17
Views: 2668

Re: Finding the right scale.

Going to purchase Ohaus scale. Cleaning and grinding the block is one of those things that eat up time. Should be perfect as I have time while being cash impaired. It seems like bob weight would still be important as they could remove material from the counter weights for lighter assemblies. Just th...
by GPGoverMPG
Fri Dec 15, 2017 7:07 am
Forum: 240-300 "Big Block" Six Performance
Topic: Finding the right scale.
Replies: 17
Views: 2668

Re: Finding the right scale.

By entire set do you mean, piston set plus rod and bearings? This is also done after resizing and inserting new ARP rod bolts, right? I have pay'ed to have this work done before now i have more time that money. This will not be the only motor I do this to so equipment purchases won't go to waste on ...
by GPGoverMPG
Thu Dec 14, 2017 5:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 300 head
Replies: 2
Views: 1004

Re: Ford 300 head

So the date code indicates 14 Nov of 1991, 1981, 1971, etc. If it has heart shaped combustion chambers it is likely the 91 after that best guess. Normally i tell people to lift the radiator cap and drive a new car under it. Doing it with a cylinder head adds a new level to the process. Best wishes
by GPGoverMPG
Thu Dec 14, 2017 4:58 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Finding the right scale.
Replies: 17
Views: 2668

Finding the right scale.

Getting engine from wrecking yard and will be doing a medium performance rebuild. Need to know some weights so I can get correct scale. I'm going to use 40 over H519P pistons and stock 300 rods. I want a pretty good scale but don't want to purchase more than I need. So with pistons, rings and pins I...
by GPGoverMPG
Sun Dec 03, 2017 11:16 am
Forum: 240-300 "Big Block" Six Performance
Topic: max mpg from 300 in a lightweight vehicle.
Replies: 32
Views: 5690

Re: max mpg from 300 in a lightweight vehicle.

E85 seems great however, it's octane isn't regulated. Hard to tune for with it's inconsistancy.
by GPGoverMPG
Sun Dec 03, 2017 11:11 am
Forum: 240-300 "Big Block" Six Performance
Topic: max mpg from 300 in a lightweight vehicle.
Replies: 32
Views: 5690

Re: max mpg from 300 in a lightweight vehicle.

If you don't plan on hooking it up a t5 would be ok. They get fragile in my experience when you apply the amount of torque a 300 is capable of. I have not seen torque numbers on a boosted 300 bet they are amazing.
by GPGoverMPG
Sun Dec 03, 2017 10:38 am
Forum: 240-300 "Big Block" Six Performance
Topic: max mpg from 300 in a lightweight vehicle.
Replies: 32
Views: 5690

Re: max mpg from 300 in a lightweight vehicle.

You'll probably want a wide ratio transmission to use all the big six's torque. Light cars get thought the RPMs quick.
by GPGoverMPG
Sun Dec 03, 2017 10:30 am
Forum: 240-300 "Big Block" Six Performance
Topic: Wrecking yard 240 or 300?
Replies: 18
Views: 2313

Re: Wrecking yard 240 or 300?

Thanks for all the help. Think I'll look for another 300 to build and reduce trucks down time. It's way easier to spend money on driving trucks than ones that are apart. How many time have you heard the I bought took it apart to build and it's still sitting there 5 years later. My drag car is excell...
by GPGoverMPG
Sun Dec 03, 2017 10:13 am
Forum: 240-300 "Big Block" Six Performance
Topic: 96' f150 4.9 poor mpg issue
Replies: 5
Views: 1547

Re: 96' f150 4.9 poor mpg issue

That's very true. The more efficient the fuel use the more fun you can have. With that said a vacuum leak to fuel regulator is a deal. If I remember right there is a vacuum tree one line to brake booster and about five others often a problem. Also make sure it's running motorcraft TFI module. Someti...
by GPGoverMPG
Sat Dec 02, 2017 6:00 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 96' f150 4.9 poor mpg issue
Replies: 5
Views: 1547

Re: 96' f150 4.9 poor mpg issue

Get it in the mud push the pedal on the right and quit worrying about the fuel economy. When you get home and brush the dirt out of your teeth you will realizes it's the grins per gallon that matter.
by GPGoverMPG
Sat Dec 02, 2017 3:06 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Wrecking yard 240 or 300?
Replies: 18
Views: 2313

Re: Wrecking yard 240 or 300?

Still :bang:
by GPGoverMPG
Sat Dec 02, 2017 2:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Wrecking yard 240 or 300?
Replies: 18
Views: 2313

Re: Wrecking yard 240 or 300?

One more shot. This is when I was stringing it to make sure body lines were right. Good times. If I can get the motor right It will be fun as :bang:
by GPGoverMPG
Sat Dec 02, 2017 2:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Wrecking yard 240 or 300?
Replies: 18
Views: 2313

Re: Wrecking yard 240 or 300?

So screw in studs it will be. Don't want to spend tons of time porting just to have go south. Trying to load a couple of pictures we'll see how this goes. Do the spring pressures on the comp cam 268 require the screw in studs to live at 5000rpm. Short duration not hanging RPM. Still in the build sta...
by GPGoverMPG
Sat Dec 02, 2017 7:41 am
Forum: 240-300 "Big Block" Six Performance
Topic: Wrecking yard 240 or 300?
Replies: 18
Views: 2313

Re: Wrecking yard 240 or 300?

So there is no real benefit to getting a wrecking yard 240. Just finish porting my 300 head, pin the studs and polish combustion chambers. By the time the block is decked and the head is shaved along with the '96 hyper-utectic pistons I should be good. Just pick a cam and let it eat. I am going to u...
by GPGoverMPG
Thu Nov 30, 2017 7:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Wrecking yard 240 or 300?
Replies: 18
Views: 2313

Re: Wrecking yard 240 or 300?

So the blocks are interchangeable? Do the older blocks have a higher nickel content? Right now it moves around (running) I can get lots of machine work done and head ported before I need to send the crank out for grind and polish. Not going with custom pistons grandson may drive it to school (has a ...
by GPGoverMPG
Thu Nov 30, 2017 7:15 am
Forum: 240-300 "Big Block" Six Performance
Topic: Wrecking yard 240 or 300?
Replies: 18
Views: 2313

Re: Wrecking yard 240 or 300?

I have not moved to screw in studs I was thinking I would drill and pin the stock stuff unless I find bad studs. I will look at the other cams and valve spring combos the spring pressures could be high enough to need the extra work. I could throw bearings and seals at it. When I put the new oil pump...