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2018 Contributors:
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2019 Contributors:
NJwpod, 1strodeo, mightynorseman, maxtrux, 6d7coupe, broncr, Phase3, 68Flareside240, bmbm40,
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Unknown->> M.Ketterer, T.Smith, J.Myers, P.McIntire - Please PM me (1966Mustang) and lemme know who you are!

Search found 376 matches

by guhfluh
Sat Jun 22, 2019 10:34 pm
Forum: 240-300 "Big Block" Six Performance
Topic: serpentine belt conversion
Replies: 52
Views: 6676

Re: serpentine belt conversion

With the 300 we're really spoiled with how good the belt routing is. We can get close to 180deg wraps on everything with no extraneous idlers and no components hanging way off in space. now, are u referring to V belt or serp? one massive drawback to v is the limited amps it can pull when the alt. i...
by guhfluh
Fri Jun 21, 2019 1:35 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 94’ 300 i6 upgrades for better horsepower
Replies: 5
Views: 149

Re: 94’ 300 i6 upgrades for better horsepower

Nitrous. Lots of nitrous...
by guhfluh
Fri Jun 21, 2019 1:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rotor Phasing
Replies: 12
Views: 232

Re: Rotor Phasing

Something like that wouldn't work to adjust the phasing like a normal adjustable rotor does. That moves the pickup plate, but the trigger wheel is still in the same relationship to the rotor, so the phasing stays the same, unless...since there's a way to adjust the spark offset in the software, once...
by guhfluh
Thu Jun 20, 2019 3:47 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Transmission choices...
Replies: 22
Views: 403

Re: Transmission choices...

Mdixon300f100 wrote:I’m still leaning toward a 4-speed based on speed/rpm calcs, I’ll be shifting out of second around 90mph

That sounds horrible.
by guhfluh
Thu Jun 20, 2019 12:05 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Transmission choices...
Replies: 22
Views: 403

Re: Transmission choices...

600hp, 2.75 gear... I vote C6 :D In a lightish truck, unless you plan on a lot of traction or really beating on it hard, I vote M5R2. The gear spacing in a ZF5 is good for towing, not for sporty driving. You can also go with an AX15 with an adapter for good strength and gear spacing. With 600hp from...
by guhfluh
Sat Jun 08, 2019 4:35 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Vacuum Secondaries
Replies: 27
Views: 890

Re: Vacuum Secondaries

I've run both the Holley 600 vacuum secondary and the Edelbrock Performer 500. I tune with a wide band also. I've chosen to stick with the Edelbrock for so long because of its drivability on both the primaries AND secondaries being much better than the Holley 600, but also because I was able to get ...
by guhfluh
Fri Jun 07, 2019 2:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Which mini starter for an old 300.
Replies: 8
Views: 307

Re: Which mini starter for an old 300.

Shouldn't need to space anything with the correct starter. My current PMGR "EFI" starter was ~$100 from Autozone and worth every bit of it to me for how easily and fast it turns over now. My old starter didn't last but a few days before it quit when heat soaked when I had headers. I don't ...
by guhfluh
Fri Jun 07, 2019 10:32 am
Forum: 240-300 "Big Block" Six Performance
Topic: Seeing is Believing: LS1 into crossflow 300
Replies: 12
Views: 650

Re: Seeing is Believing: LS1 into crossflow 300

Looks to me like it could just be an adapter plate from the LS head flange to the SBF primary flanges it looks like we're used to make up the header.

I was talking more about seeing the lifter side mods that were done at the block deck.
by guhfluh
Thu Jun 06, 2019 5:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Which mini starter for an old 300.
Replies: 8
Views: 307

Re: Which mini starter for an old 300.

Look for a starter for a 96 F150 with a 4.9L 6cly as an example. Manual starter if yours is manual, automatic if yours is automatic.

You WILL need to change the wiring slightly from stock, but it isn't that hard to do and the stock fender solenoid and stock starter cable can be reused.
by guhfluh
Thu Jun 06, 2019 5:38 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Is this hp/ torque curve correct?
Replies: 4
Views: 304

Re: Is this hp/ torque curve correct?

Wesman07 wrote:That looks like a 300 curve. Wouldn’t the 240 have peaks further up the rpm range?

Nah, I'd say definitely a 240 vs 300 peaking HP at 4k and torque at 2200rpm. 300 is peak torque below 2k, HP 3400 give or take some.
by guhfluh
Thu Jun 06, 2019 5:08 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Seeing is Believing: LS1 into crossflow 300
Replies: 12
Views: 650

Re: Seeing is Believing: LS1 into crossflow 300

Wish I could see more of what was done to get it all to work, but very nice what can be seen. :)
by guhfluh
Sat Jun 01, 2019 9:28 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Headers with turbo adapter
Replies: 14
Views: 1780

Re: Headers with turbo adapter

Twinturbor wrote:This is the setup I made for my 300 with the ego manifolds.

How much you selling for? :)
by guhfluh
Tue May 28, 2019 4:56 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Question on my air fuel ratio on my supercharger wagon
Replies: 22
Views: 573

Re: Question on my air fuel ratio on my supercharger wagon

Since you have a mechanical secondary, do you have a primary and secondary power valves? If so, they also sell boost only power valves that can help with tuning the fuel curve. Primary can stay regular and secondary can come in at 3+psi or whatever you want. They're for sale on ebay and take some cl...
by guhfluh
Mon May 27, 2019 10:22 am
Forum: Turbo, Supercharger, and Nitrous
Topic: Question on my air fuel ratio on my supercharger wagon
Replies: 22
Views: 573

Re: Question on my air fuel ratio on my supercharger wagon

Sounds like your fuel pressure may be referenced to manifold pressure below the throttle blades? It needs to be referenced above the carb, in the hat.
by guhfluh
Sat May 25, 2019 10:34 am
Forum: 240-300 "Big Block" Six Performance
Topic: Roadtrip thoughts: Loss of performance after modifications
Replies: 15
Views: 711

Re: Roadtrip thoughts: Loss of performance after modifications

Nobody will know without more info.

I'll guess carb linkage.
by guhfluh
Sat May 18, 2019 12:06 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Possible bad head gasket?
Replies: 27
Views: 862

Re: Possible bad head gasket?

I too recently installed the Chevy rockers, and I noticed that once to slack was taken up, anything over 1/2 turn visibly was pushing the valve down. With the stock rockers, I had to go to 1 1/2 turns to get the rattle out. I Took the slack out on the new ones, and went 1/4 turn. Had rattle so went...
by guhfluh
Tue May 14, 2019 8:20 am
Forum: 240-300 "Big Block" Six Performance
Topic: I dynoed the 300 again. Edelbrock 500 this time. *video*
Replies: 3
Views: 1373

Re: I dynoed the 300 again. Edelbrock 500 this time. *video*

deere114 wrote:Was this with stock rockers or higher ratio?

I believe this was with stock rockers.
by guhfluh
Fri May 10, 2019 7:20 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Stainless steel headers - eBay
Replies: 12
Views: 500

Re: Stainless steel headers - eBay

If not a typo and it is 1.5 OD is that not a little small for a 50 ci cylinder ...Probably ok on a low rpm high torque engine. It is on the small side. Same size as the Hedman headers for the 300, which is why I wish they'd have copied the 1-5/8" Hooker headers, as well as the better merge des...
by guhfluh
Fri May 10, 2019 3:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Stainless steel headers - eBay
Replies: 12
Views: 500

Re: Stainless steel headers - eBay

They should. I had Headmans in a 70 F100 w/ 240. Expect some work getting them fitted like any header, but possibly some more being China made.
by guhfluh
Fri May 10, 2019 9:34 am
Forum: 240-300 "Big Block" Six Performance
Topic: Stainless steel headers - eBay
Replies: 12
Views: 500

Re: Stainless steel headers - eBay

Not bad. It looks like a Chinese copy of the Headman in 304SS. Wish they had copied the Comp for tube diameter, but still a good deal for what it is.
by guhfluh
Wed May 08, 2019 3:40 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 lacking HP
Replies: 43
Views: 1517

Re: 300 lacking HP

I like using manifold vacuum better for most applications. I only run ported vacuum on my truck for the cool lope at idle with the cam. I'm not sure what application has only a 12* mechanical advance? My "68 F100 300" distributor has 26* mechanical advance on top of the 12* base timing, fo...
by guhfluh
Sun May 05, 2019 1:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Top things to freshen up an old engine.
Replies: 16
Views: 706

Re: Top things to freshen up an old engine.

Any standard metal timing gear set will work for basic for your basic preventative maintenance goal, but it isn't a basic easy task in my opinion. Add a timing cover gasket and tappet/lifter cover gasket set to your list. Since you will have it out, replace the rear main and front timing cover seal.
by guhfluh
Sun May 05, 2019 12:46 pm
Forum: 240-300 "Big Block" Six Performance
Topic: My 300 build discussion, dyno sheets, etc.
Replies: 2
Views: 291

My 300 build discussion, dyno sheets, etc.

Continuing this here, just for sake of discussion and not to derail anyone else's threads. I have a fairly basic 300 build that's mostly laid out in my signature. I've dynoed it a couple of times; once on a "Dyno day" on a Mustang dyno and after that on a Dynocom. On the Mustang dyno, it r...
by guhfluh
Fri May 03, 2019 2:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 lacking HP
Replies: 43
Views: 1517

Re: 300 lacking HP

My truck doesn't seem to make peak torque any higher than 1800ish. It does maintain torque up until above 3k, but peak is still around 1800. Kinda, but the torque at 3000 to 3200 isn't any lower than the torque at 2000 rpm. That is a great power band. As you pointed out the torque curve here is fal...
by guhfluh
Fri May 03, 2019 2:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 lacking HP
Replies: 43
Views: 1517

Re: 300 lacking HP

How does that engine push your 3/4 ton around? Those are some great numbers. It does okay because it's light for what it is and a 3.73 rear gear. 4650lbs without me and with a full tank. It was a lot lighter without 200lbs of deadener, without A/C, power brakes, stereo, etc. 1st and second gear are...
by guhfluh
Fri May 03, 2019 12:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 lacking HP
Replies: 43
Views: 1517

Re: 300 lacking HP

Thanks for posting the Dyno runs. The stock cam produces peak torque at 1700-1800 rpm. The actual torque peak on your engine may be bellow 1700 rpm but the converter stall rpm won't let you test any lower. The Comp 252 cam would normally move the torque peak over 2000 rpm so something is choking th...
by guhfluh
Fri May 03, 2019 12:32 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 lacking HP
Replies: 43
Views: 1517

Re: 300 lacking HP

I mostly agree with the above posts as well. Your secondaries probably aren't opening at all. With the big carb, it may not be able to get them open soon enough and maintain a good fuel ratio during the transition though, but it will take trial and error tuning. A quick check is a zip tie(not too ti...
by guhfluh
Thu May 02, 2019 1:28 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 lacking HP
Replies: 43
Views: 1517

Re: 300 lacking HP

Do you have a picture of the dyno graph? What type of dyno? Also, what 600 Holley do you have? There's a good amount that's different from my build that will effect the rear wheel power numbers, but you're down quite a bit it seems to me. I ran a new Holley 600 vacuum secondary I bought from the par...
by guhfluh
Thu May 02, 2019 12:28 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI exhaust manifold cast STEEL or iron?
Replies: 10
Views: 506

Re: EFI exhaust manifold cast STEEL or iron?

Max_Effort wrote:Cut the ball part off and then mill it for a flat flange.

Thought about doing that AND using a donut gasket with the stock ball socket pipes. Not sure if that'd be better?
by guhfluh
Tue Apr 30, 2019 4:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: EFI exhaust manifold cast STEEL or iron?
Replies: 10
Views: 506

Re: EFI exhaust manifold cast STEEL or iron?

Well poo. The price of a new one isn't a problem; I'd also like to use the manifolds if I ever get to put a turbo on and I don't care for the ball and socket design. I worry about sealing issues under pressure, heat, stress, etc. I also have this one ported already to match my head, which would save...
by guhfluh
Tue Apr 30, 2019 10:22 am
Forum: 240-300 "Big Block" Six Performance
Topic: EFI exhaust manifold cast STEEL or iron?
Replies: 10
Views: 506

EFI exhaust manifold cast STEEL or iron?

Anyone ever weld to one? My rear manifold is rusted and worn at the ball socket, and leaks. I'd like to weld different flanges on the ends of the manifolds, but not sure what material they're made from and I'm no welder to begin with. I don't have the equipment to weld or braze an iron manifold prop...
by guhfluh
Tue Apr 30, 2019 10:13 am
Forum: 240-300 "Big Block" Six Performance
Topic: 300 torque build 85 Bronco
Replies: 313
Views: 16206

Re: 300 torque build 85 Bronco

Nice fix! Haha! I was thinking it could be welded on without major issues, but not positive. I know "low" rpm diesel 4 and 6 cyl engines don't use a damper at all in some applications and there are no detrimental harmonic issues. On the other hand, I know some BMW inline 6's are sensitive ...
by guhfluh
Wed Apr 10, 2019 8:13 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Bolt-on supercharger 200 six
Replies: 15
Views: 2047

Re: Bolt-on supercharger 200 six

I'd like to be able to control timing but haven't found how. apparently, the Sniper can't control a Duraspark. Any suggestions on fuel injection or timing control are welcome. That is correct. The Sniper does not put out a zero crossing signal used by the Duraspark box. It does supply a square wave...
by guhfluh
Tue Apr 09, 2019 8:23 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Hedman vs EFI headers
Replies: 23
Views: 1046

Re: Hedman vs EFI headers

Just a note that if it helps with your plumbing for the Turbo mount, you can use a front EFI manifold on the rear cylinders with a little modification. This raises the rear outlet so the turbo connections might be shorter. https://i.imgur.com/mWgS737h.jpg I've seen mention of doing that somewhere e...
by guhfluh
Tue Apr 09, 2019 8:20 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Hedman vs EFI headers
Replies: 23
Views: 1046

Re: Hedman vs EFI headers

sandboxer wrote:I’m going to open up the EFI a bit by a 16th all around. That will assure there’s no overhang into the port.

Such is what I've done with mine.
by guhfluh
Fri Mar 29, 2019 9:14 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 240 mods update
Replies: 23
Views: 865

Re: 240 mods update

No real adaptation required with a 2 piece. Bolt the slip yoke to the u-joint. I had my front shafts shortened, but shouldn't have. I measured wrong and had it cut down before the trans was installed. I would have been better leaving it.
by guhfluh
Mon Mar 25, 2019 10:47 am
Forum: 240-300 "Big Block" Six Performance
Topic: Tractor Puller
Replies: 157
Views: 15558

Re: Tractor Puller

Nice looking work :) I've been curious, is there not enough meat in the block for 4 bolt style or splayed main caps to be built? Or also building a bedplate style girdle that ties into the pan rail as well? I'm sure it's an expensive venture only needed at top tier, but I've never seen anyone do any...
by guhfluh
Mon Mar 25, 2019 10:41 am
Forum: 240-300 "Big Block" Six Performance
Topic: 240 mods update
Replies: 23
Views: 865

Re: 240 mods update

This process has been fun to see what each mod does. In reality, the few times a year that I towed the fishing boat doesn’t justify expensive upgrades, however the mods suggested on this site have been relatively inexpensive and have helped. The 1968 f100 will now be towing our 3200 lb. pontoon boa...
by guhfluh
Sun Mar 24, 2019 8:44 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 240 mods update
Replies: 23
Views: 865

Re: 240 mods update

FTF.... did you have the T170 cast iron trans? I want to thank all the guys who encouraged me to work with my 240 and all the advice given. Yours years of knowledge are greatly appreciated!! Uh...I think so? It was the one that looked like your typical Top-loader performance 4-speed with an iron ca...
by guhfluh
Sat Mar 16, 2019 3:45 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Swap done, engine cranks, no full power stroke
Replies: 45
Views: 1332

Re: Swap done, engine cranks, no full power stroke

I second checking compression. The rockers may just be too tight.

Once compression is checked, you can move on.
by guhfluh
Sat Mar 16, 2019 3:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Next step for more HP?
Replies: 31
Views: 1567

Re: Next step for more HP?

Here's what happened to my 85 engine, shortly after hopping it up. block never opened since my grandfather bought it factory. Had about 60k miles when I pulled it out. Never pulled the pistons but it had low compression on this cylinder and one more. I don't think stock pistons and rings are up to ...
by guhfluh
Thu Mar 14, 2019 11:00 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Searching for Builds / Combos
Replies: 46
Views: 3569

Re: Searching for Builds / Combos

I would have guessed 38* was too much. Was there a difference between that and the 32* on the dyno? Not that can be definitively determined. I "lost" 20hp with less timing, but also a different carb and I believe the rockers were stock also(maybe not, but can't remember), but also a diffe...
by guhfluh
Thu Mar 14, 2019 1:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Clutch Options
Replies: 8
Views: 406

Re: Clutch Options

From what I remember, a late model F250 or F150 11" diaphragm should work fine and have a better pedal than an earlier finger style. I swapped my 11" finger style for a newer diaphragm style 10" looking for less chatter. I still have chatter, but the 10" still holds the heck I pu...
by guhfluh
Thu Mar 14, 2019 12:39 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Searching for Builds / Combos
Replies: 46
Views: 3569

Re: Searching for Builds / Combos

We need others to report their combinations also. I went first to get the thread going. Suprised I never commented. My basic build list is in my signature, minus the Chevy 250 1.75 rockers, 38*@3800rpm timing, and Holley 600. The head is home ported also, and the manifolds "matched" for n...
by guhfluh
Thu Mar 14, 2019 12:07 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: turbo 200 build
Replies: 148
Views: 20510

Re: turbo 200 build

67Straightsix Any Updates? I know the weather has prevented many from doing very much. Yes, the rain has put a damper (haha) on things. Since my last post I've taken it out for three 40 mile test drives to work out the kinks. My impressions so far; from idle to 1500 rpm it drives like a dog - from ...
by guhfluh
Tue Mar 12, 2019 7:13 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rebuilding 240
Replies: 42
Views: 2015

Re: Rebuilding 240

Pulling the clip isn't required.

Bad blowby from the breather isn't going to be the valves, it's going to be pistons, rings, bore, etc.
by guhfluh
Tue Mar 12, 2019 6:46 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Rebuilding 240
Replies: 42
Views: 2015

Re: Rebuilding 240

Something is still wrong with those numbers. 60psi cranking is barely enough to run, if at all. A Briggs has more. These trucks never came with a shroud for the 6cyls, unless you opted for A/C or HD cooling package, and even then I'm not sure it really was an option until the 70's. I have yet to see...
by guhfluh
Tue Mar 12, 2019 4:06 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 444
Views: 46708

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

Many have mentioned cost and how it's so expensive, blah blah blah. I just ran across an example or "comparison" of what you pay for porting a FORD 240/300 head WITHOUT THE HEAD factored into the price. YOU HAVE TO SUPPLY THE HEAD. Assembled with springs, retainers, guides, valves, PC seal...
by guhfluh
Tue Mar 05, 2019 3:31 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 444
Views: 46708

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

For what it's worth, I have shared this thread and info on Facebook in the recent past for those who may be interested there and don't browse forums. There isn't much by the way of Ford 300 performance groups on Facebook though.
by guhfluh
Sat Feb 23, 2019 7:21 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: Boost reference mechanical fuel pump
Replies: 5
Views: 359

Re: Boost reference mechanical fuel pump

I know people have boost referenced the mechanical fuel pump, but I cannot see It being a good idea...Not sure about the combo pump you have, but on a regular fuel pump there is no seal between the diaphragm rod and the bushing bearing...You will suck oil air out of the crankcase under vacuum and i...

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