Posts: 4
From:Toronto,Ontario,Canada
Registered: Aug 2000

posted 09-21-2000 11:15 AM            

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I was told that the 351c-4v with closed chamber heads could handle a camshaft with lift up to .600. To make things easy,say the block was not decked and the heads were not milled. The pistons are TRW flat tops with small valve reliefs. Would a .600 lift cam have clearance problems? When I try this out I will do a plastercine test but I just couldnt believe it could handle one that large without piston work.

IP: 209.47.33.47

Posts: 1002
From:Rohnert Park, CA USA
Registered: Jul 2000

posted 09-21-2000 01:05 PM               

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Its not just the lift that will affect the piston to valve clearance but also the duration and timing of the cam. The longer the duration on the exhaust is, the more likely you are to have issues. If you look at how the cycle works, the piston chases the exhaust valve closed. I don't know the exact limits, but that's another thing to think about.

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Marcus
Fast, Reliable, Cheap.... Pick any TWO of these words.
68 Mustang, still in purgatory.
BOYCOTT EXCESSIVE MOTORSPORTS

IP: 63.202.82.88

Posts: 200
From:Quincy, OH
Registered: Jun 99

posted 09-21-2000 06:06 PM               

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I don't think you will have any problems, but there is only one way to find out.

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Jason Thompson
1973 Mach 1, Q-code 4 speed 3.25 gears
1989 Mustang LX coupe 2.3 3.45 gears,
wants to be a 429

IP: 209.143.24.244

Posts: 1002
From:Rohnert Park, CA USA
Registered: Jul 2000

posted 09-21-2000 07:40 PM               

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Yup Jason's right
That's the end all be all...

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Marcus
Fast, Reliable, Cheap.... Pick any TWO of these words.
68 Mustang, still in purgatory.
BOYCOTT EXCESSIVE MOTORSPORTS

IP: 63.202.82.88