Hot Rod Forum : Hotrodders Bulletin Board

Hot Rod Forum : Hotrodders Bulletin Board (https://www.hotrodders.com/forum/)
-   Engine (https://www.hotrodders.com/forum/engine/)
-   -   Big Block Chevy Horse Power Build (https://www.hotrodders.com/forum/big-block-chevy-horse-power-build-189534.html)

d^2 12-23-2010 06:05 PM

Big Block Chevy Horse Power Build
 
Howdy

I am looking at building a Big Block Chevy for my '72 GMC 3/4 ton 4X4 with

factory A/C and posi traction. What cubic inch motor would be best to get

good fuel economy AND horse power? Is it possible to get

good economy and be able to run on pump gas? Will a 396 w/ 9.6:1

compression get better economy than a 454 w/ 9.6:1 compression? How can

I get over 400 horse power out of a 396 w/ a mild cam?



Thanks











:welcome:
:smash:

matts37chev 12-23-2010 06:10 PM

ive always gone with the bigger the motor is, the less pedal you need to make it go.

FmrStrtracer 12-23-2010 07:10 PM

You can use a smaller cam and heads on a 454 and get 400hp, the same HP from a 396 will require bigger heads and cam(more fuel use). MPG will be more related to low cruise rpm(overdrive) and good vacuum signal.

matts37chev 12-23-2010 07:36 PM

sounds like the perfect time for a peanut port headed 454
and that should be easy to find

ap72 12-23-2010 08:56 PM

You need to be more specific with your goals/combo. I may consider a stock 454 with an rv cam and headers to be perfect for your application, or a $25,000 very well built and tuned 572.

Desired mpg's? Budget? Truck details?




454C10 12-24-2010 03:31 PM

here you go.

http://www.chevyhiperformance.com/te...ild/index.html

a 385HP 396 build.

do the same with a 454 and make 440hp due to 14% more engine.

I use a 396 and a 454 in my c10 truck (not at the same time). Both engines are built the same way (mild) and the 454 has noticeable more power and gets better mpg (1 mpg better) as compared to the 396.

As for BBC's, I recommend that you build a 454 and use some good cylinder heads.

FYI, good fuel economy and big block chevy don't belong in the same sentence. My 4200 pound truck with a 3.08 gear and th400 trans gets 8 to 9 city and 12 to 14 highway (depending on speed). I would guess a 3/4 ton 4x4 would get 6 to 7 city and 9 to 10 highway with a bbc.

If you need 400hp and good mpg then you would be better off building a late model LS engine.

techinspector1 12-24-2010 03:44 PM

Quote:

Originally Posted by 454C10
As for BBC's, I recommend that you build a 454 and use some good cylinder heads.

Roger that. Start with the larger 4.250" or bigger bore. The smallish bore of a 396 cannot possibly allow the flow that a larger bore can due to shrouding of the valves.

d^2 12-24-2010 06:03 PM

383
 
Howdy

Thanks for all them there speedy replies. Would I be better off with a 383

stroker? What type of fuel economy would I get with a 700R4 behind it?


Thanks






Hey, is that a 9mm? That's nothing compared to this 44 magnum.

techinspector1 12-24-2010 06:54 PM

Quote:

Originally Posted by d^2
What type of fuel economy would I get with a 700R4 behind it?

If you ask about fuel economy one more time while discussing big block Chevies and stroker cranks, I'm gonna double up and puke on my keyboard. HOLY JESUS!!!! Buy a freekin' Honda and have it over with. Enough is enough.

d^2 12-25-2010 05:43 PM

383
 
Me Like Strokers

P.S.
Send me a picture when you puke :)

b00tz 12-25-2010 06:16 PM

build a 496 torque monster or a 427 screamer. im trying to decide which would be better for my mud monster right now lol have a 427 TD to play with.

Centerline 12-25-2010 07:45 PM

Quote:

Originally Posted by d^2
Howdy

I am looking at building a Big Block Chevy for my '72 GMC 3/4 ton 4X4 with

factory A/C and posi traction. What cubic inch motor would be best to get

good fuel economy AND horse power? Is it possible to get

good economy and be able to run on pump gas? Will a 396 w/ 9.6:1

compression get better economy than a 454 w/ 9.6:1 compression? How can

I get over 400 horse power out of a 396 w/ a mild cam?



Thanks

So is this the same 396 that you lied about in your other thread?? Oh, I'm looking at buying this motor is it priced right? Then it winds up being your motor and you're trying to sell it in the forums. :spank: :spank:

zildjian4life218 12-26-2010 12:13 PM

I second the ls motor. The GM 6.0l lq9 makes like 385hp from the factory and I believe the lq4 makes a little less. On that horsepower tv they did a 6.0 with cam and intake and made close to 500hp.

d^2 12-26-2010 02:33 PM

Do the LS's have different motor mounts? Is the bell housing the same? What would it take to convert a truck set up for a normal sbc to a LS series motor?



Thanks

1972RedNeck 12-29-2010 09:53 AM

Liar !!!!!


All times are GMT -6. The time now is 02:20 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.