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9to1 will be hard O deck the block use a 039 head gasket with a 4.370 bore .heads will need to be 110 cc it will be around 8.6

no not to small of chambers 4.610 bore by 5.500 crank

all bbc heads have screw in studs and guilde plates

well i would not run it any more then .038 from deck . big pistons can rock if you have some piston to wall .you said you were going to a thin gasket . you can used a gasket with a smaller bore size...

yes it can be 550 lift is not bad but it the DUR and lobe sep + lift that can added up to no piston to valve . you taking better then a total of.040 off heads .gasket and deck .thats less pv room

well the small cam will work better with the low CR . and the small ports may slow you down BUT .... you need more cr to go with more any thing as i see it .so i not shure how nuts your going with...

yep i have used them heads .i am doing a build right now with a set but i am going to 2.250 1.880 with 11/32 stems will be a 496. why flat top pistons ? you not going to put much cam in it that...