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Old 07-05-2011, 12:50 PM
Short bed 70 Chev
 
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Under the hood super charger

Ok, so i have a 1970 c-10 short bed. I have a mild built 350 in it right now, I'm toying with the idea of putting a super charger on it, But I DONT want it to stick out of the hood. I know there is a ton of work to be done with heads and pistons, compression, cams and all of that to go along with putting a blower on. What i'm looking for right now is some options of a super charger that will fit under the hood so i can research them and get price ideas. Thanks for your time and help.
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Old 07-05-2011, 01:41 PM
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Just look at some of the manufacturers web sites for deminisions and go from there. You'll never get a 6 or 8-71 to fit, how much boost are you looking for? thought about a turbo or Paxton?
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Old 07-05-2011, 03:46 PM
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Quote:
Originally Posted by straightshot350
Ok, so i have a 1970 c-10 short bed. I have a mild built 350 in it right now, I'm toying with the idea of putting a super charger on it, But I DONT want it to stick out of the hood. I know there is a ton of work to be done with heads and pistons, compression, cams and all of that to go along with putting a blower on. What i'm looking for right now is some options of a super charger that will fit under the hood so i can research them and get price ideas. Thanks for your time and help.

Look for a Weiand 142 or a B&M 144, both were made to fit under the hood and to be used on a stock V8.
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Old 07-06-2011, 07:59 AM
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Thanks for the replies. I will look into the b&m, from what i hear the weiands arn't the best, any opinions out there on which is better the weiand or the b&m?
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Old 07-06-2011, 08:16 AM
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Quote:
Originally Posted by straightshot350
Thanks for the replies. I will look into the b&m, from what i hear the weiands arn't the best, any opinions out there on which is better the weiand or the b&m?
I'm a Weiand fan for the street, and blowers can be had in different configurations, teflon stripped, twin rotor, triple rotor, etc.

I'm not too impressed by the smaller units, but that's my preference, big power, mine's setup for the street with about 15 pounds and methanol injection.

Heck, if you want big power you can probably get a turbo setup plumbed under the hood and go high boost, whatever fits your wallet.

I'm not dissing any setup, if I was going all out performance I'd go with a BDS or something more competition oriented. JMO.
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Old 07-06-2011, 08:55 AM
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If you stick to 5-7 lbs of boost then it will not take a lot of engine mods to accomodate that and you will get better power for things like towing at high altitudes, better passing and perhaps some increase in mileage as it takes less throttle opening to cruise. with the added power...

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Old 07-06-2011, 09:44 AM
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OK so would this kit from jegs http://www.jegs.com/i/Weiand/925/774...oductId=763758 be what you have in mind? I'm not to worried about towing or fuel mileage this is just my little toy truck for crusing around town and to some local car shows with. But i'm just one of those guys that has to have a little power to play with.
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Old 07-06-2011, 12:42 PM
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I'd love to see a picture of your truck. I had a 72 K5 Blazer that I (shouldn't have) sold ~4 years ago and now I have a 67 C-10 short bed that is currently in pieces in the shop.

As far as the supercharger goes, yes a 142 will fit under the hood of a truck like yours. I used one on the 350 I had in my Blazer. It was making 6 pounds of boost and I had 9.7:1 compression. That combination didn't work on straight pump gas but I didn't care because it made a lot of power. My only problem is that I never did find an air cleaner that would fit....

You won't regret putting a supercharger on it.
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Old 07-06-2011, 04:47 PM
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Why not use a centrifugal super charger. Mounts on brackets above the PS pump or Alternator. Also nice because it can go motor to motor when you get a new ride. Chevy to Ford etc.. Best solution for hood clearance IMO.
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Old 07-06-2011, 04:50 PM
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there is a lot of room under those hoods isnt there? we had big block 69 and 70 c20's when i was growing up
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Old 07-07-2011, 12:42 AM
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If you are willing to go for a cowl induction hood or glass on a cowl induction scoop on your truck hood, the Weiand 177 procharger works really well.

Other wise look at the low profile version of the Weiand 142 blower.

Will fit under the stock hood with the right drop base air cleaner.
( GM L88 L72)

If your motor has a low compression ratio (8.5:1 or less) it will work very well as is for low to moderate boost. What cam is in the motor now?
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Old 07-07-2011, 07:51 AM
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I'm not familar with a centerfuge super charger.

There is a good amount of room under the hood. Right now on my i have a 4" spacer on top of my carb and a 2" filter and it clears by like 4 maybe 5 inches.

Here is the info on my motor now. Its a sbc 350 bored .30 over. I'm not sure what brand of pistons they r but they r flat topped. The heads are 190 cc 64 cc chamber aluminum heads with a lunati hydraulic cam 268 adv duration. 489" gross lift.

That is what i know about the motor. I kind of planning this as a winter project while the truck is parked in the shop for the season.
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Old 07-07-2011, 08:09 AM
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I wouldn't mind going with a cowl hood they do help give the truck a good look.
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Old 07-07-2011, 10:21 AM
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with 64cc heads and flat top pistons the cr is way too high for
a street supercharged motor.

You want 8.5:1 or less to run a decent amount of boost on 92 octane gas.

76cc heads and D dished pistons

for max performance you want a 7.5:1 cr. (allows 10-12psi boost with little or no spark retard and a ton of reliable power on 92+ octane.)

High compression requires less boost, less timing or high octane racing fuel or methanol.

methanol/water injection is a option.

The practical method is to lower the compression ratio.
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Old 07-07-2011, 11:07 AM
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A centrifugal supercharger is what the guys at Paxton and Vortech make. Its essentially a belt-driven turbocharger. The carb needs a bonnet or hat that goes on top of the carb, and a charge pipe goes from the blower to the carburetor hat. Alternatively, you can use a Vortech 'enclosure' or box that surrounds the carburetor, instead of converting the carb to blowthrough.

If you want to intercool it...the pipe goes from the blower to the intercooler, and another pipe from the intercooler to the carburetor
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