Originally Posted by cdelong

you interchange the words pinch and compression as if they were the same, but they are quite different. Pinch doesn't mean crap. It's the compression seal that matters at running temp. Just because it doesn't "pinch" at TDC anymore doesn't mean it's lost compression seal.

...... and I've got a fistfull of Nova's with way more than 3 gallons on them Very little pinch, but the seal is perfect..... they won't "roll over on themselves" if you've done that test. Pinch robs horsepower.... you don't wan't a lot of pinch?? I scooped up a good finish in Hamilton last week with a measly 3 year old REX 321P MR Tuned engine with 4 gallons on it (swapped the rod at 2.5 gal for kicks) I've sold 3 gallon old Novas at the track and the guys are still running them

Some guys could ruin an engine in a gallon...... others could make the same engine live for 10 gallons. Experience and luck both play into it