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View Full Version : 2 bolt main 454 bored to 496 how much hp can the 2 bolt mains hold?



mr z71
02-01-2012, 11:11 PM
i have a 1974 454 2 bolt main. block is mint im boring it .60 over to a 496 all balanced with flat top pistons with single valve relief. i am wondering how much horse power i can push out of it with the 2 bolt main bottom end, i have aftermark ARP main cap bolt that handle 200,000 psi. max i would rev it would be 6000 rpm.

PonyKiller87
02-02-2012, 09:46 AM
If the block is mint why would you bore it .60 over?

A 496 isn't just boring its a stroker crank, longer rods and a .60 over bore. But if the block is mint I would just go .30, get a 489 and have room to bore again if you ever need it.

The cheapest I have found a cast stroker crank and rotating assembly was about $900 and it was only rated for 550 hp. For about $1200 you can get the nodular steel crank, all forged is around $1800, but its good to like 1000 hp.

If your going to keep the hp under 450 I would say the 2 bolt will work, if your looking to go more than that I would spend another $400 and pickup a 4 bolt block.

454cid
02-02-2012, 03:49 PM
Boring for discplacement is stupid in my opinion. You'll get little in return for essentially using the block up. I wouln't bore it unless it needed it.

1998454
02-02-2012, 04:15 PM
.060 over 454 is a 468. 496 with a 4.25 stroke crank that i would not run in a 2 bolt block. If your spending much on a rotating assembly and heads i would go 4 bolt.

99urbansuburban
02-02-2012, 05:44 PM
invest in a 4bolt, 496 have alot of torq, as for h.p 2bolt I had was a .30 over 454 550 recorded h.p it was in my 67 chevelle.
sold on ebay $21,000
http://i441.photobucket.com/albums/qq132/02cummins/P1010730.jpg
http://i441.photobucket.com/albums/qq132/02cummins/P1010737.jpg

Dex540
02-03-2012, 07:12 PM
Get 4 bolt splayed conversion main caps (3 center caps). Most decent machine shops can install them.

Busted Knuckles
02-29-2012, 06:57 AM
A good 2-bolt 454 block can handle 750hp with no issues. Been there, done it as have a lot of folks. We're not talking about a 350 here, big blocks all have wide registers which helps with cap stability. 4-bolts will only increase this capacity by about 75 - 100hp.
No reason not to go with a Scat nodular (they call it a 9000 series) crank. They're rated at 750hp, I know a guy that raced one well into the 10's with a 150 shot in a 2-bolt block for years without problems and he shifted at 7200, through the traps at 7500.
No reason to bore it more than it takes to clean it up. Thicker cylinder walls will help with ring seal as they're stiffer when thicker.
If you really want to learn more about big block performance, head to http://www.chevelles.com and search to your heart's content.
Find some threads with VortecPro builds. He uses mostly 2-bolt blocks and routinely gets 650+ hp with ported factory heads.

What heads are you going to run? It will take some small chambers to get compression up with flat top pistons...

Jmac72
03-08-2012, 09:50 AM
A good 2-bolt 454 block can handle 750hp with no issues. Been there, done it as have a lot of folks. We're not talking about a 350 here, big blocks all have wide registers which helps with cap stability. 4-bolts will only increase this capacity by about 75 - 100hp.
No reason not to go with a Scat nodular (they call it a 9000 series) crank. They're rated at 750hp, I know a guy that raced one well into the 10's with a 150 shot in a 2-bolt block for years without problems and he shifted at 7200, through the traps at 7500.
No reason to bore it more than it takes to clean it up. Thicker cylinder walls will help with ring seal as they're stiffer when thicker.
If you really want to learn more about big block performance, head to http://www.chevelles.com and search to your heart's content.
Find some threads with VortecPro builds. He uses mostly 2-bolt blocks and routinely gets 650+ hp with ported factory heads.

What heads are you going to run? It will take some small chambers to get compression up with flat top pistons...

I agree.
If you were running a blower(with alot of boost) or a bunch of NOS.I would want a 4bolt block.
Check this place out I have bought several engine kits from this place and have good luck.
http://www.competitionproducts.com/Chev-BB-Rotating-Assembly-454ci-4250-Stroke-4310-Bore/productinfo/CK496D-60/

Just buy 1 kit and done.