2cc Valve Reliefs= ???

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Jan 3, 2004 | 09:05 AM

Mr. B

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2cc Valve Reliefs= ???

I have a set of LS1 pistons from Diamond which have 2cc valve reliefs.

My heads are stock 853 castings, milled .030 and my previous cam was a 222/222 563/563 114lsa, and had no piston to valve issues.

I plan on using the comp cams X-ER lobes, 232/240 595/608 112lsa +4*.

If I'm not mistaken, that would be +.032 on the intake side, and +.045 on the exhaust side.

How much additional Piston to Valve clearance will the 2cc Valve Reliefs provide?

Jan 3, 2004 | 09:44 AM

Spinmonster

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Diamond pistons with 2cc reliefs provide an additional .165 distance.

Jan 3, 2004 | 10:15 AM

Mr. B

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Quote:

Originally Posted by Spinmonster

Diamond pistons with 2cc reliefs provide an additional .165 distance.

Thanks.. so it appears I shouldn't have any P/V clearance issues.

Jan 3, 2004 | 10:44 AM

Spinmonster

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nope.

Jan 3, 2004 | 06:17 PM

Mr. B

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Quote:

Originally Posted by Spinmonster

nope.

Great! Found this (from Diamond) in one of your old posts:

The -2cc valve relief pistons have the following pocket depths. Intake= .165" / exhaust= .107"

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