a 10.200 deck with 7.100 rods and a 4.500 stroke only leaves .85 for compression height on the piston. I don't think you can go any less than 1.06 or so, so I think there is something wrong with the info.
Are the pistons domed?
What is the deck clearance?
The set of b1 originals I have only go 375 at .650 and fall off from there.
Just my first thoughts.
Definitely no expert.
Piston compression height is 1.105, slight dome is .280, and piston volume is -8.7 cc because of valve reliefs. Pistons are out of the deck .012, because of machining the o ring groove out. That was to make the cometic gaskets happy. Gaskets are .080 compressed.
The guy I got the heads from had them filled 1 inch from the bottom with epoxy to run on the street. But the opened up the port before they epoxied them. To be honest I think they screwed them up because the cut them into the push rod holes and then put a super thin brass tube for the push rod to come through. Part of my theory of why the power is down is either the ports in the heads are screwed up or the headers are to small.
Dave
