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427 rpm?
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daryl087
V-6 Camaros rule!
| Posts: 26
| Joined: 11/08
Posted: 07/01/09
04:13 PM
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hi i have a 427 tall deck i put in dome pistons and longer rods had it balanced, my cam is good to 6600 but the engine does not wanna rev. it has a dual point distributor 750 holley headers and 2.5" exhaust that exits in front of rear tires. if any one sees why im not gettin the rpms i want please help me!!!!!!!!!!!!
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85_trans_am
My first time was in a Chevy
| Posts: 240
| Joined: 05/09
Posted: 07/01/09
07:40 PM
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check your valve spring rate. Your valves could be floatting. Might need a stiffer spring.
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daryl087
V-6 Camaros rule!
| Posts: 26
| Joined: 11/08
Posted: 07/02/09
04:56 AM
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no thats not it this past winter i had the heads reworked to match the cam
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Pontiacman2
Everything in my driveway’s a Chevy
| Posts: 670
| Joined: 01/08
Posted: 07/02/09
10:12 AM
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What is the fuel pressure at the carb.
Professional hi-performance engine builder
Horsepower sells Engines and torque wins races.
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daryl087
V-6 Camaros rule!
| Posts: 26
| Joined: 11/08
Posted: 07/02/09
01:30 PM
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im not sure but it does not seem to be running out of fuel. but i'll look into that
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Pontiacman2
Everything in my driveway’s a Chevy
| Posts: 670
| Joined: 01/08
Posted: 07/02/09
01:59 PM
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Also test for volume of fuel delivered.
Professional hi-performance engine builder
Horsepower sells Engines and torque wins races.
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85_trans_am
My first time was in a Chevy
| Posts: 240
| Joined: 05/09
Posted: 07/02/09
02:15 PM
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If fuel volume and presure is not the problem. Check to see if the carb might be a little to small. It might be acting like a restrictor plate. 750 carb should be good though. Might need to step up to an 850 or 900 carb if you have a big cam.
Also if your not running an air cleaner, the turbulance could be taking the air fuel mix out of the carb.
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chevelle83
I have an SS396 tatoo
| Posts: 375
| Joined: 10/08
Posted: 07/02/09
05:40 PM
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Is the cam timed correctly? I think it might be 180 degrees out. I had an engine that ran good but, it would not rev past 4500 rpms and was very weak. once we reset the timing chain it ran great.
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daryl087
V-6 Camaros rule!
| Posts: 26
| Joined: 11/08
Posted: 07/05/09
06:40 AM
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no it runs too good to be 180 out. i took the plug out of the scoop and it helped alot now i think it needs a new fuel pump
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