496 pro comp oval port hp#
i had done some searching a long time ago when i was building this bbc. I was trying to see if i could find hp potential with the pro comp large oval heads. I started out just wanting to re-gasket and change the cam in a 454 i bought but that snow balled. i had 781 heads but the cost to go to bigger valves was more than the pro comp heads so i went with those. I used the 305cc oval port heads and they needed a little cleanup. i don't remember exactly what. scat internal balanced stroker crank, pro comp h beam rods, probe 18cc dome forged pistons, pro comp air gap intake, 1 inch spacer, holley 950 street hp, some cheaper roller rockers, arp longer rocker studs, arp head and main bolts. moroso oil pan with windage and scraper (i think) should be about 10:1 but i didn't verify head gasket or deck height with builder. i called harold and used voodoo solid flat 30110742 but cut on 112 lsa from 110. 249/257 @.5 and 610/625 ( He said would 112 lsa move power band down some since i'll run ac and overdrive.) It made 630hp at 6300rpm and 615ft lbs at 3800. i am just posting in case someone was looking at a similar combination. this will be for a mostly street chevelle w a 4l80e. if you had specific questions i could try to find an answer.
still gonna be awhile before its on the road.