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BBC to SBC swap

Posted: Mon Jan 04, 2016 4:27 pm
by pkooken
I recently locked my 454 up on my boat and I'm thinking of swapping to a SBC. My question is; if I have a 95 4 bolt main that's been bored .40 over and I want to put Vortec heads and a VooDoo cam with Duration 256/262, Lift .454/.468, Dual plane intake, and a Holley 750 on top, what kind of power should I expect?

Re: BBC to SBC swap

Posted: Mon Jan 04, 2016 8:43 pm
by speedymoe128
there is no replacement for displacement is the way I always look at it

Re: BBC to SBC swap

Posted: Tue Jan 05, 2016 7:31 am
by scottyroll
I think you'd be close to about 400 HP.

750 carb may be too much.

Re: BBC to SBC swap

Posted: Tue Jan 05, 2016 1:05 pm
by odcjohn
wont have even close to torque the bbc had unless you build a 383

Re: BBC to SBC swap

Posted: Tue Jan 05, 2016 1:11 pm
by RJC5778
whats the severity of the "lock up"?

Re: BBC to SBC swap

Posted: Tue Jan 05, 2016 1:15 pm
by scottyroll
Lots of factors missing from your overall setup but the 454 is heavy piece.

If you don't have a bunch of blades and it's not necessary to have big HP then the small block should suit you just fine.

Re: BBC to SBC swap

Posted: Tue Jan 05, 2016 1:50 pm
by Rich Andrews
310.5 HP if U go to a double pumper.. I think :wink:

Re: BBC to SBC swap

Posted: Tue Jan 05, 2016 10:07 pm
by Deano
Curious, no one asked about the other unknown parameters. :scratch:

Not sure how to guesstimate HP without knowing engine size and expected RPM ?
For all we know, it could be a DD; there is nothing mentioned otherwise. If not, what ratio ?

Seems like having only partial cam specs, leaves the bigger, more relevant variables unknown.

Re: BBC to SBC swap

Posted: Wed Jan 06, 2016 10:19 am
by crowhater
All the go fast parts in the world will not substitute for CI, torque is what you want. There is nothing wrong with a small block, I personally love SBC. I would strongly recommend if you are going to use a SBC that you spend money on whats really important and purchase a stroker kit. You can get a low budget 383 stroker kit off ebay for $700. That's a new crank rods pistons, rings, etc, etc.

http://www.ebay.com/itm/SBC-383-Stroker ... Ug&vxp=mtr

check out Jegs or Summit also

http://www.jegs.com/p/Eagle/Eagle-Chevy ... 3/10002/-1

Re: BBC to SBC swap

Posted: Wed Jan 06, 2016 10:01 pm
by speedymoe128
if I was gonna build a stoker I would stroke a 400 more ci if you are set on running a sbc