Spec Stock
What are the stock specs on a Chevy 400 sb engine?
Are they basically the same as a 350 sbc? I am talking about a bone stock engine. Let’s say that it is a 1976 Chevy 400 sb. In terms of HP and torque, is it roughly the same as a stock 350? How well does a 400 sb respond to high performance parts?
A 400 had 1/8″ more bore at 4.125. It has 1/4″more stroke at 3.75. It has siamesed cylinder bores so must have steam holes in the heads to permit water circulation and these must be drilled using a head gasket for the template or you must use heads with the holes already in place. It also has a larget main journal diameter on the crank. This was to give more overlap on the rod throws and the mains to help in cutting down on crank flex with the long stroke. Nobody seems to care about that anymore although all the 69 up small blocks went to larger journals for the same purpose. They typically are torque engines not meant to be run above 5000 rpm and have small ports and small valves in the stock heads. They usually have about 8 to 1 or less compression. These specs are superior horsepower wise to some stock 350s and considerably worse in comparison to higher performance 350s. They will respond well to hot rod parts and can make quite a bit more horsepower and torque than a 350 due to the displacement and the 4.125″ bore unshrouding the valves. Their stock rotating assembly is not extremely strong though. Be careful.
GT5 GT-R Spec V Nurburgring 7:12.027 stock
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