496 pro comp oval port hp# - Chevelle Tech
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post #1 of 12 (permalink) Old Sep 15th, 19, 7:29 PM Thread Starter
jason
 
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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.
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post #2 of 12 (permalink) Old Sep 15th, 19, 7:34 PM
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Re: 496 pro comp oval port hp#

Pretty good numbers for procomp stuff. Now you just have see if the castings hold out.
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post #3 of 12 (permalink) Old Sep 15th, 19, 8:24 PM Thread Starter
jason
 
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Re: 496 pro comp oval port hp#

trying to add some pics isn't easier for me. lol
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post #4 of 12 (permalink) Old Sep 15th, 19, 8:30 PM Thread Starter
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Re: 496 pro comp oval port hp#

test
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post #5 of 12 (permalink) Old Sep 15th, 19, 8:33 PM Thread Starter
jason
 
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Re: 496 pro comp oval port hp#

custom big tire engine cradle
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post #6 of 12 (permalink) Old Sep 16th, 19, 5:21 AM
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Re: 496 pro comp oval port hp#

Really impressive numbers.

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post #7 of 12 (permalink) Old Sep 16th, 19, 7:26 AM
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Re: 496 pro comp oval port hp#

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Originally Posted by greensahara View Post
test

That's a great looking gray. What specific color is it?
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post #8 of 12 (permalink) Old Sep 16th, 19, 7:36 AM
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Re: 496 pro comp oval port hp#

Great build and results


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post #9 of 12 (permalink) Old Sep 16th, 19, 11:08 AM
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Re: 496 pro comp oval port hp#

Quote:
Now you just have see if the castings hold out.
Agree...guides also.

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post #10 of 12 (permalink) Old Sep 16th, 19, 11:58 AM
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Re: 496 pro comp oval port hp#

Nice nrs there are a couple here that used the pro comp ovals and has made great nrs.

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post #11 of 12 (permalink) Old Sep 16th, 19, 2:38 PM
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Rod
 
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Re: 496 pro comp oval port hp#

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Originally Posted by greensahara View Post
custom big tire engine cradle
Love the cradle! 630 hp? Impressive. Did they give you a dyno sheet? Post it, if you can.
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post #12 of 12 (permalink) Old Sep 16th, 19, 5:16 PM Thread Starter
jason
 
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Re: 496 pro comp oval port hp#

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Originally Posted by Blown1932 View Post
That's a great looking gray. What specific color is it?
i got it off a 2018 nissan altima gun metal gray. using metalux paint and clear.
1N4AL3AP1JC162931
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