454 BB vs. SB
Pro
Joined: Oct 2004
Posts: 510
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From: Pipe Creek TX
Originally Posted by 81 Vette
Not sure about them being larger than 2.200, but I do know you can get 227cc heads that will flow better than 320cfm intake and 230cfm on exhaust.....that should be enough. 
My error ; I meant 4.200 bore on the block; not head cc's.
Burning Brakes
Joined: Sep 2004
Posts: 917
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From: Vernon British Columbia
St. Jude Donor '05
First C3 General Poster!
Yea I think youre right about that. you can get a 434 out of a 4.125 bore....I think you can get a 472 from a 4.250 bore though. That would be the VERY maximum edge of an SBC.
Melting Slicks
Joined: Jun 2001
Posts: 2,340
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From: Moro IL
I think one thing has gotten lost in this discussion, the Rat's main advantage is in it's cylinder heads, not it's displacement. Try to find how many aftermarket small block chevy heads will even flow the numbers of my stock 049 BBC heads.
Pat Kunz
Pat Kunz
Burning Brakes
Joined: Sep 2004
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From: Vernon British Columbia
St. Jude Donor '05
First C3 General Poster!
Originally Posted by 73 LS-4
I think one thing has gotten lost in this discussion, the Rat's main advantage is in it's cylinder heads, not it's displacement. Try to find how many aftermarket small block chevy heads will even flow the numbers of my stock 049 BBC heads.
Pat Kunz
Pat Kunz
Team Owner
Joined: Feb 1999
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From: Republic of Texas
Originally Posted by Homie
Just 472? 
The $8K disposable Big cube small block.
Great motor until you drop a cylinder and have to bore but can't because to had to bore it to the max to get the 472ci.
Burning Brakes
Joined: Sep 2004
Posts: 917
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From: Vernon British Columbia
St. Jude Donor '05
First C3 General Poster!
only 8k hahaha no wonder its dropping a rod.
The thing with that MASSIVE overbore is that you HAVE to run theeee best parts in the engine or it will fly apart within 20k miles. You can have a solid 472 making around 650hp thatll last a good long time, but the turnkey cost is about....meh....14 grand.
Worth it? meh....I can build a lot more than 650hp for 14 grand, but then how many street cars have a 472?
The thing with that MASSIVE overbore is that you HAVE to run theeee best parts in the engine or it will fly apart within 20k miles. You can have a solid 472 making around 650hp thatll last a good long time, but the turnkey cost is about....meh....14 grand.
Worth it? meh....I can build a lot more than 650hp for 14 grand, but then how many street cars have a 472?
Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Originally Posted by 73 LS-4
I think one thing has gotten lost in this discussion, the Rat's main advantage is in it's cylinder heads, not it's displacement. Try to find how many aftermarket small block chevy heads will even flow the numbers of my stock 049 BBC heads.
Pat Kunz
Pat Kunz
Big Block 049 - Source Chevy High Perfomance Cylinder Head Test
Small Block Victor Jr. - Chevy High Perfomance Cylinder Head Test
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Drifting
Joined: Aug 2004
Posts: 1,883
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From: Lubbock TX
Not a very fair apples to apples comparison on those head flows. The 049's that CHP tested had factory stock 2.06/1.72 valves - that Edelbrock small block head had bigger valves out of the box. If you're gonna use that big of a small block head - average is probably a lot closer to 165 or so - do the same with a big block head. How about my 360cc runner Pro Toplines? No CNC work, flowed 407 out of the box, about the same price as your Edelbrocks and that's still not as big as you can get on big blocks, plus you still have Big Chief and Big Duke stuff to consider. Stroke that smallblock all you want, when you open the hood, it's still a small block and will NEVER have the WOW factor of a big block. Even if you can't get it to the ground, the big block's torque and breathing ability is tough to beat. Matter of fact, IMHO, the only way to beat a big block is with a bigger block. I'm considering a 532 myself (4.0 stroke, 4.6 bore). My .02
Melting Slicks
Joined: Jun 2001
Posts: 2,340
Likes: 2
From: Moro IL
My point wasn't that there isn't aftermarket small block heads that can outflow my heads, I know there is and you showed one of them. My point was that it takes a healthy aftermarket small block head to even outflow a stock oval port big block head.
Pat Kunz
Pat Kunz
Race Director
Joined: Apr 2000
Posts: 17,676
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
I suppose since you have Protopline heads that you have heard of the Protopline PRO 14deg SBC PRO STOCK DRAG RACE HEAD that flows 415.9cfm out of the box ?
There is also something called port velocity which allows a smaller head to make more power if matched with correct components.
BTW I am not serious about this stuff
There is also something called port velocity which allows a smaller head to make more power if matched with correct components.
BTW I am not serious about this stuff
Last edited by MotorHead; Oct 7, 2004 at 10:59 PM.
Burning Brakes
Joined: Sep 2004
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From: Vernon British Columbia
St. Jude Donor '05
First C3 General Poster!
Originally Posted by BlackRocket
Anyone know the weight difference between a 454 small & 454 big block motor???
