![]() Top gasket pic is one with the extra cooling holes. ![]() ITS Real easy to drill the holes in the earlier blocks if you don,t have then with a 3/8" drill, using the gasket as a pattern as it was found to increase cooling. I think it is 80 & up mark IV big block engines that has the later improved cooling with the three extra holes. The result is the pump is starved for oil intake flow. Yes Ive seen several cases where guys failed to install the oil pump pick-up at the proper minimum 3/8"-to-1/2" off the oil pan floor clearance, Ive generally found trying to base the basic build on a 9.7:1-10.7:1 compression level and a cam with a 236-245 duration lift on a fairly tight LSA of 108-110 with a 750-850cfm carb and a 3.54-4.11:1 rear gear in the drive train, and decent headers, produces good results. ![]() If your going to build a 396 based street performance engine you've got many options,youll generally want a set of decent flowing oval port heads a matching oval port intake and a cam, and matching compression level that will unlock the engines full potential Ive generally found a moderate flat tappet solid lifter cam can be used to produce impressive power gains at minimal cost. The basic 396-402 big block block engines have been mostly over looked in the rush to get the larger bore size blocks from the 427-454-502 engines so prices have not risen nearly as fast due to far lower demand.įinding a complete 396 will generally take less effort and cost less than a 454-502 because of that lower demand, but that doesn,t indicate the 396-402-434BBC combos can,t produce impressive horsepower levels if the correct parts are selected. Most street cars with the 450-500hp a 396 can easily produce are more than competitive. Ive never understood why many guys turn up there nose at building a 396 based BIG BLOCK for a hot street car engine combo,and then build a 383 SMALL BLOCK and think they made the correct choice, the far stronger components, and in many cases the better flowing heads provide the basic 396 BBC with a distinct power advantage or at lease the potential to produce superior power, especially if your limiting your choices to mostly low buck$ O.E.M.
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