Piston Valve Relief CC's

elmir50 · 08-07-2001, 04:23 PM

I need to know what the 4 valve reliefs displace on a stock piston, in cubic centimeters. The pistons are out of a 91, 302 HO. I have aftermarket pistons, Speed Pro does not list what the valve reliefs are in CC. I need this info to finsih calculating my compression ratio.

Thanks.

juiceman · 08-07-2001, 05:29 PM

the valve reliefs on most pistons are 5 -7 cc's. total.

BlackFly · 08-08-2001, 12:23 AM

i think its hard to calculate the cc's on stock piston releifs because of the .030 dish in the center of it. 5-7 sounds pretty close, i've installed flat tops for a 306 that had releifs measuring 8 cc's and they were a little bit deeper than stock.

08-07-2001, 04:23 PM	#1
elmir50 Registered Member Join Date: Mar 1999 Location: Tsawwassen BC Canada Posts: 413	Piston Valve Relief CC's I need to know what the 4 valve reliefs displace on a stock piston, in cubic centimeters. The pistons are out of a 91, 302 HO. I have aftermarket pistons, Speed Pro does not list what the valve reliefs are in CC. I need this info to finsih calculating my compression ratio. Thanks.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Piston to Valve Clearance Check - 351W	Peldor	Classic Mustangs	4	01-31-2008 08:29 PM
AFR 185's w/E-303: Piston to valve clearance problems?	yelowjaket	Windsor Power	9	04-01-2003 07:50 PM
Any piston to valve clearance prob with AFR 165's?	5ohCOUPE	Windsor Power	2	03-09-2003 12:39 AM
valve seal vs piston ring oil leak.	thdrcat	Classic Mustangs	2	07-30-2002 07:06 PM
Please - I need advice on piston to valve clearance ASAP	2FastLX	Windsor Power	8	03-18-2001 03:05 PM

08-07-2001, 05:29 PM	#2
juiceman Registered Member Join Date: Jan 2001 Location: ny Posts: 197	the valve reliefs on most pistons are 5 -7 cc's. total.

08-08-2001, 12:23 AM	#3
BlackFly Registered Member Join Date: Feb 2001 Location: winnipeg , manitoba , canada Posts: 83	i think its hard to calculate the cc's on stock piston releifs because of the .030 dish in the center of it. 5-7 sounds pretty close, i've installed flat tops for a 306 that had releifs measuring 8 cc's and they were a little bit deeper than stock.