317 or ls6 heads
#12
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depends on the cam. i milled .040 off some 243's and put them on a 5.3 with a tr220 and used 7.4 pushrods. right now i am stock headed with a tr224 and am using 7.45's. most aftermarket cams have a smaller base circle.
#17
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yeah i should be fine then guess im ordering some head bolts i can get the heads milled down for 60 bucks at the machine shop near my house so thats decent shuld i order new head gaskets or use the ones i got the motor only has 6,000 miles