What head are you running, 452? I wonder what your true comp ratio is. It's been quite some time since I had my 70 440 apart, but with the stock pistons I think they were like .060 or .070 down @ TDC. My memory says that I calc'd it at just under 9.5:1 with FelPro .040 comp gaskets and 346 heads (which are virtually identical to 906 and 452 heads). Just curiosities stumbling around in my mind.
18 Ram 2500 4x4 Big C and a 6 speed
87 Blazer FOR SALE, clean, original truck, 2.5" lift
Last edited by crashnzuk; 01-30-2019 at 09:24 AM.