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Search found 413 matches

by guhfluh
Thu Oct 10, 2019 4:52 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Intermittent miss
Replies: 16
Views: 333

Re: Intermittent miss

I have tries to set the vacuum advance curve not quite sure I have it right. If I try to pass or get on it it stumbles and backfires on 4th and 5th gear Does it 'stumble and backfire' with the vacuum advance unplugged? I'm going to echo my post above, simply because I've seen this sooo many times s...
by guhfluh
Fri Oct 04, 2019 2:21 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Lower EFI intake runner for performance?
Replies: 2
Views: 155

Re: Lower EFI intake runner for performance?

Anyone know the runner length and diameters of the EFI lower? The length is 9.88" +/- 0.10" and the I.D. at entry is 1.625". I have not measured the port dimensions. Thank you. That is close to what I estimated and unfortunately what I feared the ID was near. It seems to me that the ...
by guhfluh
Thu Oct 03, 2019 7:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Lower EFI intake runner for performance?
Replies: 2
Views: 155

Lower EFI intake runner for performance?

Anyone know the runner length and diameters of the EFI lower? What is the effective head runner length/size to the back of the valve? What I'm curious about is the effective tuning RPM of just the lower and it's power potential or at what point it would become a restriction. I'm also interested in b...
by guhfluh
Thu Oct 03, 2019 7:07 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Carb Options For Offy Dual Plane on 240
Replies: 4
Views: 202

Re: Carb Options For Offy Dual Plane on 240

Anything is going to take some decent reworking of the factory linkage on a 72 to work sideways on a Dual Port manifold. What may work the best is a conversion to cable from a late 70's truck or something from Lokar that might convert the stock linkage.
by guhfluh
Thu Oct 03, 2019 6:59 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Y Pipe For EFI Exhaust Manifolds For 72 Model Year
Replies: 2
Views: 109

Re: Y Pipe For EFI Exhaust Manifolds For 72 Model Year

The Walker Y pipes are crinkle bent and the merge angle isn't the greatest, but still reported to work well. In some they also have a lot of material blocking the merge section that wasn't cut out of the pipe before the other one that is merging in is welded on. People just reach in with a grinder a...
by guhfluh
Thu Oct 03, 2019 3:05 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 300 Rebuild
Replies: 56
Views: 2516

Re: 300 Rebuild

Smart move, because if you have to go .060 over to clean the bores you may not have the cylinder wall thickness for it to work. I think .030 overbore is the normal max for a 300 block. Like you said don't waste money on a junk block. Your list of new engine parts sounds real good, good building. Na...
by guhfluh
Thu Oct 03, 2019 2:59 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Intermittent miss
Replies: 16
Views: 333

Re: Intermittent miss

Just a note here that may at least help it run better. The distributor you purchased probably does not have the correct ignition curve for a 1990 EFI headed 300. If you used the 1990 head on the engine when you swapped it into your truck, it probably needs a lot less advance curve under cruise and l...
by guhfluh
Sun Sep 22, 2019 3:41 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Ford 240/300 P&C Distributor As A Spare
Replies: 7
Views: 539

Re: Ford 240/300 P&C Distributor As A Spare

I noticed one of those links is an original new Ford/Autolite distributor that isn't rebuilt for about $120. Just in case you missed it.

I don't have a spare though. I wish I had kept my original load-o-matic instead of trading it in for a core.
by guhfluh
Sun Sep 22, 2019 3:36 pm
Forum: 240-300 "Big Block" Six Performance
Topic: 1988 F-150: Hood latch modifications to fit huge intercooler
Replies: 6
Views: 304

Re: 1988 F-150: Hood latch modifications to fit huge intercooler

You should be fine without it, but bracing would be nice, as well as bracing with/through the intercooler.

Expect decreased A/C performance.
by guhfluh
Sun Sep 22, 2019 3:30 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Radiator Help Needed
Replies: 3
Views: 208

Re: Radiator Help Needed

I have a 72 F100 - 240 … The radiator it currently has is shot and cannot be repaired. The original core measures 17.25H x 20W with mounting holes measuring 23" from center to center. There is another wider set of holes that measure 28.5" center to center but I would have to move my overf...
by guhfluh
Mon Sep 16, 2019 8:43 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Progress on the '56. Help decide on this motor!
Replies: 83
Views: 2538

Re: Progress on the '56. Help decide on this motor!

https://www.diyautotune.com/support/tech/inside-the-v3-57-board/ I've installed 3.57 boards in cars, and am ok with it. Prefer leads that go through holes and soldered for off road stuff. Bruh, I'm so sorry. I had a major brain fart on smt vs through board. I thought you were recommending the smt b...
by guhfluh
Mon Sep 16, 2019 4:37 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Progress on the '56. Help decide on this motor!
Replies: 83
Views: 2538

Re: Progress on the '56. Help decide on this motor!

Multiport with individual coils can be done with Megasquirt 1 with extra code (I prefer V3.0 boards in vibration ridden trucks, no surface mount components). Simple and cheap. It's possible to control TBI injectors with Megasquirt. They don't like low impedance injectors, but you can get 100 lb-hr ...
by guhfluh
Mon Sep 16, 2019 4:25 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: turbo 200 build
Replies: 163
Views: 24872

Re: turbo 200 build

If injector overheat is the issue, it may be easier to upgrade to a modern high impedance pencil style injector that handles heat better. Another thing I can't tell from the pictures or the video is how the fuel flow is routed. Fuel should be circulated from the pump through the rail from one end to...
by guhfluh
Sun Aug 25, 2019 11:15 am
Forum: 240-300 "Big Block" Six Performance
Topic: Extrude Hone for 300/4.9L engines
Replies: 21
Views: 831

Re: Extrude Hone for 300/4.9L engines

You can have a cam made with less lobe lift and long duration but it is better to have higher lift cam lobes with lower rocker ratios than low lobe lift and high rocker ratios. Can you explain why that is? It's always seemed to me that it would be the opposite, to a certain point, as it should keep...
by guhfluh
Fri Aug 23, 2019 9:33 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Permanent 300 Six Cyl Head CFM solutions- A Work in Progress
Replies: 472
Views: 60531

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

F-250 Restorer wrote:Is there a link to where I can check the flow results and the prices for the diff. heads?

viewtopic.php?f=2&t=77978
by guhfluh
Fri Aug 23, 2019 10:06 am
Forum: 240-300 "Big Block" Six Performance
Topic: Progress on the '56. Help decide on this motor!
Replies: 83
Views: 2538

Re: Progress on the '56. Help decide on this motor!

Thanks. So it sounds like its a constant flow delivery? No, it's a progressively controlled, PWM pump speed output based upon user defined boost pressures and ramp rate. Mine started around 10psi and all in above 21psi, though I did try starting around 1psi and saw quicker spool and boost came on q...
by guhfluh
Fri Aug 23, 2019 8:57 am
Forum: 240-300 "Big Block" Six Performance
Topic: Progress on the '56. Help decide on this motor!
Replies: 83
Views: 2538

Re: Progress on the '56. Help decide on this motor!

I have had success in the past using single nozzle 1000cc pure meth injection with 93 octane at the 500hp and 28psi level on my 2.4L 4cyl. What size nozzle and at what injection pressure? It is AEM's single nozzle progressive kit and large nozzle. They say it's 200psi for the pump and the nozzle is...
by guhfluh
Thu Aug 22, 2019 10:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Extrude Hone for 300/4.9L engines
Replies: 21
Views: 831

Re: Extrude Hone for 300/4.9L engines

Pmuller, at what point are the longer valves needed? Part of it is availability. AFAIK SI valves is the only place that has the pre 1985 4.810" stock length 300 six oversized valves in 1.94" intake and 1.60" exhaust. Other than that the SBC valves that fit the 300 six head start at 4...
by guhfluh
Thu Aug 22, 2019 8:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Extrude Hone for 300/4.9L engines
Replies: 21
Views: 831

Re: Extrude Hone for 300/4.9L engines

Pmuller, at what point are the longer valves needed?
by guhfluh
Thu Aug 22, 2019 8:17 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Progress on the '56. Help decide on this motor!
Replies: 83
Views: 2538

Re: Progress on the '56. Help decide on this motor!

Not sure I've ever known anyone to drive 2000 miles nonstop or how much fuel that would actually take, but I understand that not everyone likes to use water/meth injection and the downsides to using it. I like using methanol or water/meth in certain instances, but my biggest concern is always the di...
by guhfluh
Wed Aug 21, 2019 7:48 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Tri Power Again
Replies: 140
Views: 17513

Re: Tri Power Again

I don't know why it should go lean on a tip-in. Maybe check your accelerator pump circuit to make sure it is not leaking back down or not filling properly. Well with the 3 carbs working together, I didn’t set it up progressive you barley need to move the peddle. So the accelerator pumps just dribbl...
by guhfluh
Wed Aug 21, 2019 7:23 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Progress on the '56. Help decide on this motor!
Replies: 83
Views: 2538

Re: Progress on the '56. Help decide on this motor!

Non-intercooled with the Sniper TBI ahead of the SC would be the way to go, but with that type of SC, I'd worry more about fuel distribution with the inlet and outlet style of the SC and fuel running through it. I'd want to run a tapered style adapter from the SC to a carb style OFFY C or Clifford v...
by guhfluh
Wed Aug 21, 2019 7:11 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Extrude Hone for 300/4.9L engines
Replies: 21
Views: 831

Re: Extrude Hone for 300/4.9L engines

I really like this method of opening up the intake manifold on this engine. It works on the whole length of the manifold and improves it all. It's no cheap, at $755.00 (as of 8/20/2019), it's still cost effective compared to someone trying to use a hand grinder to do the same. Extrude hone has been...
by guhfluh
Wed Jul 24, 2019 11:39 am
Forum: Turbo, Supercharger, and Nitrous
Topic: turbo 200 build
Replies: 163
Views: 24872

Re: turbo 200 build

What injectors are being run?

Many of those older style have issues with heat. There is also the possibility of injector driver overheat, depending on what injector ohm range, how they're wired and how they're driven.
by guhfluh
Wed Jul 17, 2019 10:07 am
Forum: 240-300 "Big Block" Six Performance
Topic: slanting a 300
Replies: 12
Views: 789

Re: slanting a 300

Don't forget about starter clearances and engagement.
by guhfluh
Wed Jul 17, 2019 10:04 am
Forum: 240-300 "Big Block" Six Performance
Topic: 240 cooling fan
Replies: 7
Views: 575

Re: 240 cooling fan

FWIW, it will not stay cool without a shroud and with A/C. Been there, even with oversized V8 radiator.

Make sure the clutch is operational. It should be locked up solid when hot.
by guhfluh
Sun Jul 14, 2019 9:11 pm
Forum: Turbo, Supercharger, and Nitrous
Topic: 300 Turbo Cam
Replies: 15
Views: 740

Re: 300 Turbo Cam

Im going to try a comp 268h but i dont believe its the right direction for the best turbo performance. A larger cam works if you are looking at a higher rpm power band to make more HP. The single pattern cam is OK if you are not using a log type exhaust manifold. You really want a wider LSA than th...
by guhfluh
Thu Jul 11, 2019 1:42 pm
Forum: 240-300 "Big Block" Six Performance
Topic: Edelbrock avs2 1901
Replies: 12
Views: 983

Re: Edelbrock avs2 1901

I really want to try a Street Demon. I'm still using the basic Edelbrock 500 without tunable secondaries. I've put a 1" insulated spacer on in place of an aluminum one I had on and I didn't see any benefit. I still get boil over after a hot shut down. I don't have issues with it while it's runn...
by guhfluh
Thu Jul 11, 2019 1:29 pm
Forum: 240-300 "Big Block" Six Performance
Topic: So I have a plan but now im Second guessing myself.
Replies: 120
Views: 5317

Re: So I have a plan but now im Second guessing myself.

Yeah, I'm confused. First you said exhaust at .105", then .050", then ICL. I'd remeasure it all a few times to be sure.
by guhfluh
Tue Jul 09, 2019 10:45 pm
Forum: 240-300 "Big Block" Six Performance
Topic: So I have a plan but now im Second guessing myself.
Replies: 120
Views: 5317

Re: So I have a plan but now im Second guessing myself.

By the way, that looks advanced...depending what is true TDC on the balancer.
by guhfluh
Tue Jul 09, 2019 10:15 pm
Forum: 240-300 "Big Block" Six Performance
Topic: So I have a plan but now im Second guessing myself.
Replies: 120
Views: 5317

Re: So I have a plan but now im Second guessing myself.

Verify TDC with a piston stop and re-mark the balancer.
by guhfluh
Tue Jul 09, 2019 3:05 pm
Forum: 240-300 "Big Block" Six Performance
Topic: So I have a plan but now im Second guessing myself.
Replies: 120
Views: 5317

Re: So I have a plan but now im Second guessing myself.

I haven't followed this from the beginning, but question the cam choice for a low rpm field truck with 2.73 gears. I agree with going back to the stock rockers. I would also try tuning the carb and timing more. Give it manifold heat if it wants it. My cam is advanced 4* with Cloyes gears, but no deg...
by guhfluh
Thu Jul 04, 2019 10:32 am
Forum: 240-300 "Big Block" Six Performance
Topic: 300 Build advice
Replies: 8
Views: 557

Re: 300 Build advice

Poor gear and Trans match.
by guhfluh
Thu Jul 04, 2019 10:28 am
Forum: 240-300 "Big Block" Six Performance
Topic: Lugging a 240
Replies: 1
Views: 265

Re: Lugging a 240

Possibly AFR, possibly ignition timing.
by guhfluh
Thu Jul 04, 2019 10:27 am
Forum: 240-300 "Big Block" Six Performance
Topic: 300 Rebuild
Replies: 56
Views: 2516

Re: 300 Rebuild

Would explain why they look so far down in the hole in the pics...unless it's just not at TDC. Maybe it was their way of keeping detonation at bay? LOL
by guhfluh
Thu Jun 27, 2019 2:49 pm
Forum: 240-300 "Big Block" Six Performance
Topic: serpentine belt conversion
Replies: 56
Views: 8320

Re: serpentine belt conversion

Did you redrill the mounting holes or were they already cast there? I'm also curious if I could use the older v-belt style alternator bracket instead and how the pulleys would line up, while just using the PS and AC bracket and associated other serp belt parts. I didn't have to drill new holes in t...
by guhfluh
Wed Jun 26, 2019 4:48 pm
Forum: 240-300 "Big Block" Six Performance
Topic: serpentine belt conversion
Replies: 56
Views: 8320

Re: serpentine belt conversion

So after showing my belt routing earlier here without the AIR pump and the interference with the lower alternator bolt I went to pick-a-part to get a 3G alternator to replace the 2G with its bad reputation. I picked an alternator from a '92 Mercury Sable 3.0L. It had a 5 groove pulley so I used the...
by guhfluh
Sat Jun 22, 2019 10:34 pm
Forum: 240-300 "Big Block" Six Performance
Topic: serpentine belt conversion
Replies: 56
Views: 8320

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: 522

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: 19
Views: 1125

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: 1202

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: 1202

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: 35
Views: 2240

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: 639

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: 14
Views: 1247

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: 639

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: 541

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: 14
Views: 1247

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. :)

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