454 rotating assembly
Pro
Joined: Sep 2012
Posts: 600
Likes: 6
From: Key West Florida
http://www.jegs.com/i/KB-Performance...oductId=755792
i would use thoes, with your heads it will put you between 10-10.5 comp ratio. i ran L88 pistons with 781 oval ports in a 427 i built and it ran great on pump gas. i ran thoes heads till i had enough money for a set of ALU heads.
i would use thoes, with your heads it will put you between 10-10.5 comp ratio. i ran L88 pistons with 781 oval ports in a 427 i built and it ran great on pump gas. i ran thoes heads till i had enough money for a set of ALU heads.
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
I've been looking for rotating assembly for a 454.
It's not going to be anything crazy, 400-450HP.
I have a set of big oval iron heads (aluminum not in the budget for now) that are around 113cc so with a standard 4'' stroke and assuming zero piston to deck (or alternatively a thinner gasket that puts me in the .040'' quench distance) I need arround 12cc pistons, right?
The problem is that most of the complete rotating assemblies available have either dished or crazy large domes?
The only sensible one I can find (at Summit) is this one:
http://www.summitracing.com/int/part...make/chevrolet
I've been reading some older posts here that mentions problems with Eagle cranks. Is that still the case? I was looking at Scat brand kits because of this, but they don't seem to have any combos that fits my application (mostly forged cranks or either dished or huge domes)
It's not going to be anything crazy, 400-450HP.
I have a set of big oval iron heads (aluminum not in the budget for now) that are around 113cc so with a standard 4'' stroke and assuming zero piston to deck (or alternatively a thinner gasket that puts me in the .040'' quench distance) I need arround 12cc pistons, right?
The problem is that most of the complete rotating assemblies available have either dished or crazy large domes?
The only sensible one I can find (at Summit) is this one:
http://www.summitracing.com/int/part...make/chevrolet
I've been reading some older posts here that mentions problems with Eagle cranks. Is that still the case? I was looking at Scat brand kits because of this, but they don't seem to have any combos that fits my application (mostly forged cranks or either dished or huge domes)
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Why not bump the stroke?
http://www.summitracing.com/parts/ue...make/chevrolet
http://www.summitracing.com/parts/sc...make/chevrolet
http://www.summitracing.com/parts/sc...make/chevrolet
http://www.summitracing.com/parts/mr...make/chevrolet
This gets you 489 cubic inches, .038 Quench and 10.1 to 1 compression. Should be fine on pump gas with a moderate sized cam because of the tight quench.
This is internally balanced so you would have to do that there.
You will need all the incidentals like rings, bearings ect.
I don't believe there is any clearancing of the block needed on the BBC 4.250 stroke. If so it is minimal.
This cam gets you right on for pump gas. Drop the operating range listed about 300 RPM.
http://www.summitracing.com/parts/hr...make/chevrolet
http://www.summitracing.com/parts/ue...make/chevrolet
http://www.summitracing.com/parts/sc...make/chevrolet
http://www.summitracing.com/parts/sc...make/chevrolet
http://www.summitracing.com/parts/mr...make/chevrolet
This gets you 489 cubic inches, .038 Quench and 10.1 to 1 compression. Should be fine on pump gas with a moderate sized cam because of the tight quench.
This is internally balanced so you would have to do that there.
You will need all the incidentals like rings, bearings ect.
I don't believe there is any clearancing of the block needed on the BBC 4.250 stroke. If so it is minimal.
This cam gets you right on for pump gas. Drop the operating range listed about 300 RPM.
http://www.summitracing.com/parts/hr...make/chevrolet
Last edited by 63mako; Feb 16, 2014 at 11:32 AM.
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Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
Thanks for the links, I appreciate that very much.
There is definitely much more to choose from when going for a 4.25 inch stroke. I'm not crazy about that long stroke though. The block would have to be clearanced for the longer stroke.
I would really like to avoid that. Machine work (like everything else) is insanely expensive here in Denmark.
Wouldn't a roller 489 make way more than the 450HP I'm looking for?
@Gary: Not much choice with a big block, as far as I know only the stock intake fits under the hood.
There is definitely much more to choose from when going for a 4.25 inch stroke. I'm not crazy about that long stroke though. The block would have to be clearanced for the longer stroke.
I would really like to avoid that. Machine work (like everything else) is insanely expensive here in Denmark.
Wouldn't a roller 489 make way more than the 450HP I'm looking for?
@Gary: Not much choice with a big block, as far as I know only the stock intake fits under the hood.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Any clearencing, if any at all, that you might need to do can be done in your garage with a die grinder, check youtube theres probably videos. Im not sure which cast iron head you have, do you have a casting number? A 489" or i believe .060" makes it a 496" could hit 500 horse with a small roller, 8.5 to 1 compression and some mild porting on the right cast iron head and aluminum high rise intake, the torque it made would make ya poop. Are you wanting to go cast on the crank?
Burning Brakes
Joined: Sep 2012
Posts: 818
Likes: 0
From: coon rapids mn
hood clearance was what I was thinking about ,when it came to a big block intake .a dual plane that fits under the stock hood mite be a restriction with a stroker bbc and a big roller cam .you mite have to use a performer oval intake ,I don't know if a oval port rpm performer will fit under the hood you have . it will make good power with a flat tappet cam .but you can never have enough power in a corvette .
Le Mans Master
Joined: Oct 2006
Posts: 7,123
Likes: 433
From: Gladstone MO
C3 of Year Finalist (appearance mods) 2019
CNC Motorsports or Ohio Crankshaft. Call them and tell them what heads you're using and they can spec exactly what pistons for the desired compression. And bore. New forged crank, rods, pistons, bearings and rings for around $2K.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
10 to 1 with iron heads will be no problem if you keep the quench tight, around .040 and the intake valve closing point @ 67 or higher. This would be a fairly mild cam for almost 500 CI. What trans and gearing do you have? It will make a difference at what you can build and still be effective
Burning Brakes
Joined: Sep 2012
Posts: 818
Likes: 0
From: coon rapids mn
looking around real quick ,I saw some SRP pistons that would be around 10-1 compression .they make pistons for a 4" and a 4.250 " stroke bbc .the are for a .060 over bore ,using a 6.385 rod .is you car a original bbc ?
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
your probably right in sense that a cast crank will probably do the job just fine. I tend to want to go forged on the rotating assembly for cheap insurance and piece of mind. I'm sure a cast crank would be fine just not something I'd do. I dint know much about the 241 heads, but a search on chevells.com in the performance section will net you a wealth of information. The 781's & 049's seem to be the popular ovals.
Last edited by bluedawg; Feb 17, 2014 at 11:52 AM.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I have a manual four speed (1:1 final) and 3.08 axle. I'm hoping to do something about the misfit axle ratio at some time.
I was looking at the piston and rods you linked to. They are also available in a 6.385 length. Isn't that the type you would normally use with a 4.250'' stroke? I read that the longer rod helps with clearances as well. No sure how though...
I was looking at the piston and rods you linked to. They are also available in a 6.385 length. Isn't that the type you would normally use with a 4.250'' stroke? I read that the longer rod helps with clearances as well. No sure how though...