Cranking Compression

I thought it was the sealed power pistons (also called 405p)you had in the motor and the other guy is right, those sealed power pistons are about .100 down in the hole. (1.576 comp. ht)
I guess the speed pro pistons at 1.637 and .050 off the deck would make a ton of difference. 160 aint too bad then. great for pump gas and aluminum heads. You dont need racing fuel. The video is bad-***! 2 thumbs up