Quote:
Originally Posted by Excaliber
Rodknock, most of those GM crate motors make their power from a low rpm roller cam, 5,200-5,500 rpm, in that range. Old school tech was based primarily on high rpm, thats a whole different setup for the heads, intake, etc.
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The original HP crate engines available from Chevy during the 1970's, 1980's and 1990's, such as the L88, LS6 and LS7 has solid flat tappets installed. Rollers were not widely available then.
Obviously, the newest offerings are now roller cam engines.