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Old 05-02-2006, 08:58 PM
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hp limit on stock 12 bolt?

i have a chevelle 70. with a 12 bolt that came out of a 4 door 72 cutlass. what are th hp limits on a 12 bolt stock. i heard 400 hp is about it. what will need to be done for it to handle about 600hp . what parts will i need & how much will it cost?

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Old 05-02-2006, 09:29 PM
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Quote:
Originally Posted by chevelle4542speed
i have a chevelle 70. with a 12 bolt that came out of a 4 door 72 cutlass. what are th hp limits on a 12 bolt stock. i heard 400 hp is about it. what will need to be done for it to handle about 600hp . what parts will i need & how much will it cost?
I ran a 12 bolt in a nova drag car back in 1971. Kept breaking all the stock parts. Finally used a Summers Brothers spool, axles, and bearing caps. Zoom pro gears. Finally it would last a season then had to replace the gears.

I ran a 302 small block, tunnel ram, roller cam, One of the first Doug Nash 5 speeds ( serial # 002 ) on that tranny. Ran 5.86 gears. The car ran 10.90s pretty fast car for 1971.
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Old 05-03-2006, 06:15 AM
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Are you going to race this car??? slicks, radials, Or street only...

Are you sure that it is a 12 bolt??? I think most of the olds rears were 12 bolt covers but 10 bolt carriers....

Keith
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Old 05-03-2006, 06:19 AM
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Quote:
Originally Posted by chevelle4542speed
i have a chevelle 70. with a 12 bolt that came out of a 4 door 72 cutlass. what are th hp limits on a 12 bolt stock. i heard 400 hp is about it. what will need to be done for it to handle about 600hp . what parts will i need & how much will it cost?
Before you buy parts, pull the cover if you have not done that yet. There were a lot of ten bolt carriers inside of Oldsmobile twelve bolt housings.
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Old 05-03-2006, 06:57 AM
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If it IS the 10 bolt ring gear in the 12 bolt housing you are looking at 400 HP, but if it is a 12/12 then you should be able to go up to what the factory put out back then, if not more.

A true 12 bolt will hold 600 for the most part as it is from the factory, but a few goodies like better axleshafts, and a cover with the bearing preload screws will give it a bit more.
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Old 05-03-2006, 09:46 AM
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Depends on your suspension too, but if you're getting good hooks with slicks you should overbuild your rear. I only say this because if it does fail its going to do it at a really bad time. Safety first.

K
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Old 05-03-2006, 09:57 AM
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well it comes with 4 link susp stock. 70 chevelle. i havent open the rear end yet. so when i do how do you tell that it is a true 12 bolt? what to look for?
will true 12 bolt componits fit in there? i have never heard of a 10 bolt with a 12 bolt housing. learn something every day!! is this still a good rear end if it is a 10 bolt?
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Old 05-03-2006, 10:11 AM
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A "12 bolt or 10 bolt" carrier is determined by the number of bolts that hold the ring gear on. The number of bolts that hold the "cover" on is just a coincidence. If you open the housing, counting the bolts on the ring gear will tell you what it is.
Just keep in mind that the output of the engine has nothing to do with the longevity of a rear end. You can have a thousand HP in front of a 7 1/2" open diff and not hurt it if you can't hook... Hooking hard, with slicks and traction devices, is what will break the diff and this can be done with a 250 horse motor..A street car will never see that kind of traction so keep this in mind before you spend thousands of dollars on parts you really don't need.
Mark
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Old 05-03-2006, 10:19 AM
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hp limit on stock 12 bolt?

Here is a link where you can compare all those rear ends:

http://www.hotrod.com/techarticles/48618/
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Old 05-03-2006, 12:18 PM
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I don't know about stick shift or transbrake- equipped cars. But I do know that stock Chevy (with "12 bolts on the ring gear") 12-bolt housing, stock axles, stock-style cluthc-type eaton positraction unit, and "GM gears" will last forever in a footbraked auto application.

Above parts bought out of 3600 lb big block footbraked Nova where they were run for years as fast as 9.90. Put into my 3600 lb small block footbraked Nova years ago. Have put hundreds of passes from the 12's down to the 10's (best of 10.69)

Horsepower guesstimates about 550 HP for my car.

All runs above using slicks with short times in the mid 1.40's

A side note, if you plan on drag racing this car, technically NHRA wants aftermarket axles in anything faster than 11.000
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Old 05-04-2006, 06:53 AM
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A Chev 12 bolt (8.875 in) has a pressed 'wave' in the backing plate to oil the carrier bearings - as does the early (8.2 in) 10 bolt.
A 10 bolt Olds (8.5 in) with a 12 bolt cover has no 'wave' just a domed cover.
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