[Allen M]

I got a 1975 454 w/ 2 bolt mains. Will it hold up to a 475 hp motor and occationaly a 200 shot NOS. 4 bolt mains are getting harder to find. Will a stud kit be enough or do I really need another block? Any suggestions?

Here's more info:

Forged crank and pistons, Crower sportmans rods, 9 to 1 compression.

[This message has been edited by AlMyPal39 (edited 01-21-2002).]

 

[Mr69]

Why don't you convert your block to 4 bolt ?
Runs about $300 or so.

Nate

 

[Golden67]

SS3964N8 is right about the conversion. Make sure you get the new mains line honed. I would be more concerned about cast crank and pistons with a 200HP NOS shot. You didn't say if you had forged crank and pistons. Cast pieces are usually good for about 125HP.

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67 Malibu 454/TH350
Team Chevelle Gold Member #97
Charleston, SC

 

[Michael]

Yes, my friend ran 8.90's in the 1/4 w/ a two bolt. You will have no problem.

 

[Mike Feudo]

Leave it at 2bolt BBs don't give any trouble in the main department unless something is wrong. Like michael I have a friend with a 2bolt Super Comp car that he runs real hard and has had no problems.

 

[Cable]

<BLOCKQUOTE>quote:</font><HR>Originally posted by Golden67:
SS3964N8 is right about the conversion. Make sure you get the new mains line honed.
<HR></BLOCKQUOTE>

If changing to 4 bolt main caps then he will need the block line bored, line honing doesn't cut it when using different caps.

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Cable Bright
-'70 El Camino 454 RAT
(Drag Project)

"....after all, people just want a normal life and a cool car....most people settle for the car."

 

[driverk]

We have a 2 bolt. I had the same concerns, my mechanic said not to waist my money changing to 4 bolt unless I was heading towards the 600 - 800 hp range. We are supposedly at 475 to 500, hasn't run yet so I don't know for sure. The mechanic, (who is a big time drag racer), also set the engine up for nitrous in the future and said their will be no problems. The Mechanics Camaro is in the 7-8 second range, I trust him.......bk

 

[chris454ss1970]

You shouldn't have any probs with a two bolt main, I have a buddy thats all he has aver run. If you are worried about it you could go ahead stud it.

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[FO_FDYFO]

you will have no prob with the block with the 475hp but the extra 200 does worry me. personally I would not risk it. spend the extra whatever to convert it. the 4 bolt conversion turns out being stronger then factory 4 bolts anyway. at the very least put bran new ARP main bolts in it. don't torque them more then twice, if you do I would get new ones again. all of these guys are probably right it will be ok, but I am just saying that if you are going to hit it with an additional 200 hp on top of 475 I would not want to chance it and potentially have to pull it back out and replace parts. look at is insurence. just my advice.

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1970 Chevelle 454 Wagons haul A$$ in style! "The Chopped Suburban". to see some goto
www.EINSTYN.com FO_FDYFO = four-fifty four! TC#1460, VCEA#2

 

[driverk]

FO_FDYFO is right, I forgot to mention that my mechanic put beefed up main bolts in. He said that is the weak point......bk

[This message has been edited by driverk (edited 01-22-2002).]

 

[NovaDad]

I too know of someone who is running in "Super Street" with a Nova body that is running a two bolt main 454. He hasn't had any trouble with his. But he does deny that it has only two bolt mains when people ask about it!

Dave

 

[von]

Bobby DeArmond ran the first "uncorrected" 9 second ET in history for a legal NHRA Stock Elim car last year in his A/SA 427 425 hp '69 Camaro. He also had the honor of tearing it down to be certified legal by NHRA. In front of the world to see was a 2 bolt main block. A 9 sec run in a 3400+ lb Camaro would take well over 600 HP.

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von '69 300 Dlx SS TC #15 ACES #1575
My '69 SS