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Old 03-08-2003, 02:27 PM
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Post twin turbo small block chevy

i wanna put twin turbos on my small block powered 70 chevelle road race car. anyone make manifolds for this?
the motor is a completely stock 350 4 bbl out of something in the 70's. i got it with the car, and hub didnt tell me what he yanked it out of. so.....
what other mods should i consider to work with the turbos?
i was planning on a single plane, a 750 holley, and some form of cam, as well as a better ignition system, cause the stock hei is crap.
so yall tell me.
thanks
mike

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Old 03-08-2003, 06:44 PM
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hit the serch engines and look for "twin turbo chevy". you should be able to find some sort of help or info on manifolds. blower carbs and nitrous cams work well in turbo aplications.
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Old 03-08-2003, 07:57 PM
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Well, "some form of cam" would defintely do good. I think without it, your power potential is somewhat stunted.

If you dont know the history of the engine, I would pull it apart for a rebuild at minimum. A stock engine will handle boost for a while as long as it is setup properly and you dont push your luck. I would suggest some better bottom end parts though.

As for manifolds, they are few and far between. I have never seen a new set for sale, But have come across many used on ebay. But for the $400-$600 you would have to give for them, I would build my own. I mean you could buy a welder for that much if you dont have one.

chris
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Old 03-08-2003, 11:57 PM
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Here is a link to a guy that has done just that, the first link is a pictorial of how to, in step by step form. the other link is an itemised breakdown of what is involved, and i second turbos10 in the notion of spending the money on a MIG welder and doing the manifolds yourself. a set of gale banks logs are 6-700 dollars and they flow much worse than the ones shown on the pages below

http://www.2quicknovas.com/turbos.html
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Old 03-09-2003, 12:01 PM
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You could use the standard cast iron manifolds swapped side to side and turned upside down. These will flow ok for a turbo setup and they give you a strong base to mount the turbos onto. Use a mild cam with not much overlap and check that your compression ratio is not much above about 8.5-1. You will also need to use the highest octane fuel you can find,keep the engine as cool as you can (big radiator)and limit total timing to about 28-30 deg,up to about 8-10 psi of boost.
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