Posted by PARTSMASTER on December 29, 1998 at 22:39:15:
In Reply to: Mark V 454- 340 horse? posted by Steve M. on December 23, 1998 at 14:30:33:
: I recently bought a boat with a BB Chevy. It was sold to me as a 340 horse 454 (Indmar), with a factory cast iron low-rise intake, Holley 750 CFM vac-secondaries, etc. Where are the part#'s located on the block and heads so that I can verify the year, hp rating, internal components, etc? Is there a website which can help decode these numbers? Looking through the oil filler holes in the valve covers, I can read "Mark V", so I know it's a pretty new engine. I'm new to Chevy stuff, I've been afflicted with the Oldsmobile disease for many years, and I've finally wised up and come over to Chevy.
It must be the vortec 454 . Give me the casting #'s off the heads.