Pushrod length
So I measured my pushrods wrong it seems. I measured them a long while ago and came to 6.400" on my 1971 302 block with retrofit roller lifters and roller rockers. The valve tip pattern was perfect however I was trying to start the engine for the first time and it seemed like I had no compression. So I put 30psi of shop air in the spark plug hole and listened and sure enough it's coming out of the intake manifold and the exhaust. So I shimmed it until it was no longer leaking and found that at .080" worth of pedestal shims it stopped leaking. I clearly need shorter pushrods, but I did this measurement while the engine was primed with oil and it only took 1/4 turn from snug to full so it didn't seem like there was any lifter preload hardly. So maybe 6.35" pushrods are my ideal length. This was my valve tip pattern with the 6.4" pushrods when I measured the first time. I have gt40p heads a melling 24110 cam and trickflow valve springs I'll be installing soon paired with some flat top trw L-2482 pistons.