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Old 07-27-2012, 04:56 AM
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supercharging a 72 chevy 350

ok so im building a 1923 t-bucket rat rod and im starting from the motor and going from there. i have a 350 block. the numbers on the block say its a 1972. now im only 17 so im still learning in the process of me doing this project with the help of my dad (who is a mechanic) but i wanted to know if someone could tell me what im going to have to do to this engine when im rebuilding it so i can stick a supercharger on it. i know i need a supercharger friendly cam. .. not sure what else.
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Old 07-27-2012, 05:14 AM
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supercharging a 72 chevy 350

ok so im building a 1923 t-bucket rat rod and im starting from the motor and going from there. i have a 350 block. the numbers on the block say its a 1972. now im only 17 so im still learning in the process of me doing this project with the help of my dad (who is a mechanic) but i wanted to know if someone could tell me what im going to have to do to this engine when im rebuilding it so i can stick a supercharger on it. i know i need a supercharger friendly cam. .. not sure what else.
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Old 07-27-2012, 06:19 AM
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It depends on what size blower you are talking about. The smaller ones (144-177) will work on a stock motor but if you're talking about a 671 or bigger, there are things that need changed.
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Old 07-27-2012, 07:04 AM
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how much power do you need? If its for looks and not a serious race car you can under drive the blower with a near stock cam and make 400 plus reliable hp,very cheap.There are a couple cars like that in my neighbourhood,2 of them have been running over 10 years with nothing other than normal services.one rat rod is raced a few times every year.It runs low 12,s with 2 carter AFBs.Obviously the car makes 400 HO or less
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Old 07-27-2012, 07:22 AM
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Get
this book this book
.
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Old 07-27-2012, 08:08 AM
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Hey Grant, I'm not a moron! I did my "get this book" on the thread he posted on the Engines board before the threads were combined.

Hey jeseusmi, Grant (GT23T) and I are both blown T-bucket guys. We strongly recommend you educate yourself with that book so that you can ask the right questions when you are ready to build your motor.
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Old 07-27-2012, 11:22 AM
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thanks for the advise. id like to make this car for the drag strip but i still wanna be able to drive it on the road so im not sure what size blower i should get. and if i do get a bigger like the 6-71 what would i need to have changed?
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Old 07-27-2012, 12:48 PM
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Get "the book" and read it!! most of your questions will be answered........
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Old 07-28-2012, 12:11 PM
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In my opinion a stock block can't take more than say 400hp on a regular basis so you don't need to worry about a "supercharger friendly cam;" A stock cam will do just fine for 400hp.

1) Will a centrifugal supercharger put strain on the crank nose---i don't know; Small block chevy crank noses CANNOT take the strain of a roots type blower. (not sure about the smaller ones though---144, 177's etc.)

This needs to be researched first and foremost.

If you want to go roots and are happy with around 400hp/450tq then i would at the very least be looking at a forged crank with a larger nose----such as what scat offers. Personally, if i was going to go all that way, i would also be looking at a hi-po block such as bowite or dart; This way i can just crank to boost up to get 500, 600, 700 etc. ponies.
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Old 07-28-2012, 08:33 PM
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Actually, before we go any further it would be best to establish the budget for the engine.

Anything otherwise is just wanking.
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Old 07-28-2012, 08:39 PM
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against all odds,what happens to a stock block if I exceed 400HP?
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Old 07-29-2012, 09:22 AM
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i'm afraid stock blocks can't take much over 500hp on a regular basis without cracking.
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Old 07-29-2012, 02:09 PM
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Is it 400 or 500 horse power? and where does it crack? You have me worried now.
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Old 07-30-2012, 03:30 PM
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i think it's somewhere in between 400 and 500hp, so i said 400 to be safe. And as far as cracking i think it will start in the base of the cylinder wall, but i would have to double check. But i really believe that stock blocks really can't handle more than 400 to 500hp. Not for very long at least. i would welcome any comments criticizing or augmenting my statements.
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