![]() ![]() This is easy to achieve in most cases with SBC's as a stock GM piston is from deck, so with a 1094 Felpro steel gasket (compressed. The larger chambers call for a few changes in engine build development.įirst would be to consider a slight cut on the heads (32deg. I've used several set's in street and marine engine builds and they have delivered trouble free performance. seats along with these 'thick' casting design are also a plus. The later GoodWrench factory hardened exh. ![]() They actually have a nice workable port shape and with a good performance valve job they will flow about as good as many of the factory HP heads we often search for. 270(+/-) range with a lift, they will deliver a nice bottom-end (seat-of-the-pants) feel, produce a fairly flat torque curve and easily support up to with moderate upper rpm limits. Remember, these are a version of the 72~73 Corvette LT-1 heads - so they have ' some' performance genes The '993's are most mild street performance builds a set of 1.94" '993 heads will work just fine. ![]()
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