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Old 06-05-2006, 18:41   #1 (permalink)
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351W valve springs

Hi everyone, been a while since my last post. Anyway, I have a TC Corty with a 351W w/ Edelbrock Performer RPM package e.g. heads, cam and manifold. I have mixed it up a bit by using a Demon 750 DP instead of the Edelbrock carb and Mallory ignition of the same specs as what Edelbrock recomends. The package is supposed to make max power at 6000rpm, ever since the build I have noticed a slight "crackle" at about 5500rpm, so i havn't been able to rev it any harder. I thought it was fuel delivery related so i fitted the biggest mech pump i could find. It is still pulling hard up to that point but makes the noise at 5500rpm. Finally went to a dyno day the other day, it got to 5500rpm and made the noise, the operator backed off (thanks to the guy, has good mechanical sympathy). He recons it is valve bouncing , but only on the left bank. This surprised me because the heads came from Edelbrock with the valves and springs installed. Anyone exerienced anyhting like this?
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Old 06-06-2006, 15:41   #2 (permalink)
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Re: 351W valve springs

What cam are you using? If it's showing more lift than the springs are rated for, you'll definitely have issues.
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Old 06-06-2006, 15:45   #3 (permalink)
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Re: 351W valve springs

Don't remember the cam specs off the top of my head but it is the one Edelbrock recomends for the package.
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Old 06-12-2006, 08:19   #4 (permalink)
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Re: 351W valve springs

did you check the installed height?
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Old 07-16-2006, 07:03   #5 (permalink)
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Re: 351W valve springs

Yep, sounds like your floating the valves. double check with edel about the cam specs. You might take the springs in to the shop and have them check the seat pressure. Above all, just make sure that the springs dont bind at full lift, that's the name of the game.
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Old 07-16-2006, 15:55   #6 (permalink)
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Re: 351W valve springs

Thanks guys. I didn't check the installed height, seems very stupid in hindsight. Could have been much worse! I just assumed that if I used all Edelbrock stuff everything would be sweet.
I have learnt from my mistakes.
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