BBC Horsepower Estimate - The 1947 - Present Chevrolet & GMC Truck Message Board Network

custom72c20 · 03-21-2009, 08:19 PM

I am currently building a big block and was wondering if I could get some input on how much power it will make. Here is a list of specs:

468ci
-10:1 compression
-stock crank and rods
-1969 427 vette heads (ovals) 3919840 casting numbers
-- 2.19 int. & 1.88 exh. valves with some port work and bowl blending
-hydraulic cam with .575/.575 lift and 306 total duration on a 108 lobe center
-RPM Performer Air Gap Intake-Edelbrock (dual plane)
-Holley 800cfm double pumper

I'm thinking in the 500 range, but you never know. All help is appreciated. Thanks.

1BAD70CHV406 · 03-22-2009, 12:24 AM

Ya you sound like you are in the 500 range but what heads do you have. with a desent set of heads you should be making well over 500 close to 550 and of course it will be a torque monster bc of the big CI

custom72c20 · 03-22-2009, 03:58 PM

The heads I have are similar to the 781 heads. Thanks for the input.

Rodms · 03-23-2009, 12:16 AM

Maybe high 4 s

03-21-2009, 08:19 PM	#1
custom72c20 Registered User Join Date: Oct 2006 Location: Temecula,CA Posts: 309	BBC Horsepower Estimate I am currently building a big block and was wondering if I could get some input on how much power it will make. Here is a list of specs: 468ci -10:1 compression -stock crank and rods -1969 427 vette heads (ovals) 3919840 casting numbers -- 2.19 int. & 1.88 exh. valves with some port work and bowl blending -hydraulic cam with .575/.575 lift and 306 total duration on a 108 lobe center -RPM Performer Air Gap Intake-Edelbrock (dual plane) -Holley 800cfm double pumper I'm thinking in the 500 range, but you never know. All help is appreciated. Thanks. __________________ Nick Old pic of my 72: http://img340.imageshack.us/my.php?image=img0435co5.jpg 04 Silverado Daily Driver 68 GMC short step http://67-72chevytrucks.com/vboard/s...d.php?t=379665 "I'll beat you to the gas station!!"

03-22-2009, 12:24 AM	#2
1BAD70CHV406 Registered User Join Date: Feb 2009 Location: Plano, TX Posts: 14	Re: BBC Horsepower Estimate Ya you sound like you are in the 500 range but what heads do you have. with a desent set of heads you should be making well over 500 close to 550 and of course it will be a torque monster bc of the big CI

03-22-2009, 03:58 PM	#3
custom72c20 Registered User Join Date: Oct 2006 Location: Temecula,CA Posts: 309	Re: BBC Horsepower Estimate The heads I have are similar to the 781 heads. Thanks for the input. __________________ Nick Old pic of my 72: http://img340.imageshack.us/my.php?image=img0435co5.jpg 04 Silverado Daily Driver 68 GMC short step http://67-72chevytrucks.com/vboard/s...d.php?t=379665 "I'll beat you to the gas station!!"

03-23-2009, 12:16 AM	#4
Rodms Registered User Join Date: Jul 2008 Location: Olive Branch,Mississippi Posts: 347	Re: BBC Horsepower Estimate Maybe high 4 s __________________ Built chevy tuff!



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