Can anyone confirm my compression? I'm not exactly sure how to accurately measure it but I'm hoping I can get a good idea from what I know...

350 with TRW "L2256F30" flat-tops. They are advertised as 9.72:1 with my 64cc heads. My block has been 0-decked and I'm running Fel-Pro 1003 head gaskets (.041 in. compressed thickness). I'm assuming this will give me a little over 10:1? Or am I off?

Thanks,
Chris

Chris,

Go over to ROSS Racing Piston's web site and play around with their compression calculating program. It's fun to do and will help you out.

I have several times checking out various combinations. pdq67

Hmm never realized there wasn't all THAT much involved in figuring it out... I'm assuming the TRW's valve reliefs are 5cc (can't find a definate answer about that anywhere)? If so I was right on the money with the 10.3:1 estimate I had in my brain.

Thanks,
Chris

I've run those pistons and the reliefs are more like 12cc. If they are the ones I remember they have the double-eyebrow valve reliefs and are about 12cc. Should make 9.75:1 with 64cc heads on a zero decked 350 as advertised.

If they are in fact single-eyebrow reliefs your 10.3:1 estimate is pretty close.

Just my opinion.

ps. if you were wondering, double eyebrow reliefs allow the same piston to be used on both sides of the engine. They are usually cheaper this way since only one casting is needed.

I'm using those pistons. Your compression is actually higher than that with a zero deck. The advertised #'s are for the average factory block which is not zero decked.

Rod

I called up TRW and got a definate answer on the valve relief cc's they said 6.1cc for my pistons.