383 stroker acts like fuel starvation at WOT - Page 3 - Hot Rod Forum : Hotrodders Bulletin Board
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  #31 (permalink)  
Old 02-18-2017, 05:19 PM
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To add one more thing, any tuner you take it to who is worth a damn, the very first test he is going to do is confirm fuel pressure at load under WOT conditions......does that tell you anything??!!!

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  #32 (permalink)  
Old 02-18-2017, 08:14 PM
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I had an ignition box do something very similar. If you can tape your timing light to the hood aimed where you can see it as you drive, when it acts up you'll know if it's ignition by the way the light reacts.
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  #33 (permalink)  
Old 02-18-2017, 08:16 PM
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Just curious, have you checked your tank vent?
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  #34 (permalink)  
Old 02-19-2017, 01:36 AM
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Post 14 and post 34 are advising to hookup a fuel pressure gauge so you can see it when your driving. You're shooting in the dark until you can start eliminating something.

And along the same question with 36 Sedan, where is your tank vent? Is the little gizmo fitting on the passenger side top of your fuel cell the vent?

If it you are losing spark when this occurs, then the proof will be on the plugs right after it quits, and also when it finally restarts. If spark is the issue, then there should be a good cloud of blackish smoke when it re-fires indicating a rich condition from the excess fuel.

https://www.carid.com/quickcar-racin...LegBoC6Arw_wcB
Something along the lines of one of these rigged up temporarily would identify a fuel pressure issue as well.
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Old 02-19-2017, 08:10 AM
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Most hydraulic lifters make good rev-limiters.
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  #36 (permalink)  
Old 02-19-2017, 09:53 AM
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Quote:
Originally Posted by MouseFink View Post
Most hydraulic lifters make good rev-limiters.
But not at sub 5000 rpms - no disrespect meant.

I'll bet a Dunkin coffee and breakfast sandwich that he has a fuel problem. Who wants take that bet, meaning if I win that you have to come to you sunny Upstate to pay me
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Old 02-19-2017, 10:03 AM
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Ill take the bet Jim if I just buy the sandwich when we meet. I just want some actual test results as this seems like a simple problem??? Why all the delays? Why buy random parts without actual proper test results?
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  #38 (permalink)  
Old 02-19-2017, 10:20 AM
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Quote:
Originally Posted by vinniekq2 View Post
Ill take the bet Jim if I just buy the sandwich when we meet. I just want some actual test results as this seems like a simple problem??? Why all the delays? Why buy random parts without actual proper test results?
We can go visit Autogear(Nate) while your here. His place of business is beyond impressive

And I agree - fuel, air, spark, the OP has something out of whack. Hopefully he shows back up.
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  #39 (permalink)  
Old 02-19-2017, 10:38 AM
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Seeing Nates shop would be great.My tko probably came through his shop to my seller here
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  #40 (permalink)  
Old 02-19-2017, 11:42 AM
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Quote:
Originally Posted by 64nailhead View Post
But not at sub 5000 rpms - no disrespect meant.

I'll bet a Dunkin coffee and breakfast sandwich that he has a fuel problem. Who wants take that bet, meaning if I win that you have to come to you sunny Upstate to pay me
I agree, hydraulic lifter pump up and valve float at 5000 RPM is unusual with stock anti pump up lifters, but not unheard of. The old style hydraulic lifters without a piddle valve, were used until the inventory was depleted in 1969. Those lifters would pump up above 4,000 RPM if you were using a hydraulic lifter camshaft with a radical profile.

I bought a new 1969 Firebird 400 with a 4-speed and a 3.36:1 rear end. That Firebird would float the valves and the engine would stall between 5,000 and 5,300 RPM just like someone turned off the ignition key. I could pedal it and get the motor below 5,000 RPM and the engine would catch again.

I replaced the stock hydraulic lifter camshaft with a Crane Z-300 solid lifter camshaft with Crane 120/300 lb valve springs. I soon broke the 3.36:1 rear end using a pair of GoodYear 11" slicks. The Pontiac Zone Office replaced the 3.36 gear with a 4.33:1 four pinion Saf-T-Track , free of charge , under the GM 50,000 mile Drive Line Warranty. No more problems with valve float shifting the Pontiac 400 at 6,000 RPM.

I finally spun out rod bearings because I was driving the Pontiac 400 like it was Chevrolet 327. The stock 3/8" rod bolts stretch and loosen the rod cap at high RPM in the long stroke Pontiac engines.
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