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-   -   Estimated HP on 455 buildup (https://forums.maxperformanceinc.com/forums/showthread.php?t=434898)

drewhelm1974 07-22-2002 05:20 PM
I was wondering if I could get a Guesstimate on a combo I am building. Here's what I have....

74 455 bored .030 over
standard crank
Lunati Bracket master II cam - 292/230 .490 110sep
Performer intake
1 5/8 headers
holley 750 vac sec
HEI ignition
compression ratio between 9.5:1 and 10:1
I haven't decided on the 6X-4, 96, 66, 5C or 15 heads, suggestions?

Any help would be greatly appreciated!

drewhelm1974 07-22-2002 05:20 PM
I was wondering if I could get a Guesstimate on a combo I am building. Here's what I have....

74 455 bored .030 over
standard crank
Lunati Bracket master II cam - 292/230 .490 110sep
Performer intake
1 5/8 headers
holley 750 vac sec
HEI ignition
compression ratio between 9.5:1 and 10:1
I haven't decided on the 6X-4, 96, 66, 5C or 15 heads, suggestions?

Any help would be greatly appreciated!

shovelrog 07-22-2002 07:38 PM
have you played with the simulated engine dyno at www.pontiacwarriors.com

Half-Inch Stud 07-22-2002 08:01 PM
For most people, about 460HP, but for you about 560HP if you use the 5C heads.

Nice Lunati cam.

drewhelm1974 07-23-2002 11:13 AM
Huh? Does that mean I get the extra 100 horses from the stickers? hehehe

5C heads, huh? I need to find some....

drewhelm1974 07-23-2002 11:15 AM
That web page is unavailable.

Mr-Bratt 07-23-2002 03:39 PM
Quote:
Originally posted by Drew H:
That web page is unavailable.
<font size="2" face="Verdana, Helvetica, sans-serif">Same thing I have been getting there all week :confused: I wanted to see the difference between the Nunzi 2041 cam I am using now and his 2042, oh well I guess I must wait, was thinking of doing a quick switch before norwalk, But since I have not ran the car I could get a better idea of the change if I run it first with this one, Jim

PROBRD 07-23-2002 05:59 PM
I ran it through a program I have and guessed at a few things but came up withabout 450 hp gross and 340 net hp. Should run around 12.90 in a 3500lb. car.

Roy Zink 07-24-2002 07:04 AM
How about a 455...60 over....#64 heads.....performer intake with Rochester quadrajet.....RA IV cam....dual point ignition....hedman hedders???? Horsepower??? Somebody told me that with those heads I'm up near 11:1 compression...any truth??
Thanks Roy

drewhelm1974 07-24-2002 09:41 AM
How about a 455...60 over....#64 heads.....performer intake with Rochester quadrajet.....RA IV cam....dual point ignition....hedman hedders???? Horsepower??? Somebody told me that with those heads I'm up near 11:1 compression...any truth??
Thanks Roy


Not sure on horsepower, but depending on what else you've done to the block and heads the CR shouldn't be that high. If they are 87cc heads, .060 overbore, standard stroke, standard 6.7 cc dish piston, deck height is .020, gasket thickness of .039, CR would be 9.97:1. If the heads or deck have been milled the CR can go up quickly.

drewhelm1974 07-29-2002 11:05 AM
Minor changes....

It is a 71 block, standard bore and crank. Does that change the numbers much? It will be run through a 2.5 inch Flowmaster exhaust.

Thanks!

Drew


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