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Old 09-29-2008, 07:32 PM
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Supercharge the mouse or build a rat?

So the general idea here is I have a newly purchased 1977 GMC Sprint that has a beat but functional 350 under the hood.

I'm still young and all about speed so I'd like to build up a more powerful motor. I happen to have a freshly bored (30 over) and align honed 350 block in my garage. But as an automotive tech student and someone who grew up in a racing family I know that I need to go about this the right way. So I'm starting with research. Lots and lots of research.

I've still debating whether I want to use that 355 block I have or go big. So any input here will be helpful but don't be the evil guy trying to talk me into stuff--> . I have that bad enough already.

Now if I do use my block I have I'm pretty set on supercharging it. I don't want to deal with the trouble of fuel injection so I've been looking into Vortechs carburetor in a box blow through design. If all works out well it's capable of 1.5 to 1.85 horsepower per cubic inch which is 532.5 to 656.75 horsepower for those without a calculator handy. Now that is a substantial amount of power for a small block Chevy. I'm sure that will motivate this car along very well.

But since I'm building a motor from scratch why not do something larger.

But how big is to big? As an automotive tech student I'd like to build something that will test, hone, and showcase my talents not to mention just be plain old fun to drive. I really love the look of the Sprint which is an El Camino with GMC badges on it for those of you not familiar with it. But this baby isn't a light weight. I believe it is about 4000 pounds as it sits now but with the benefit of a decent weight distribution from what I hear. So how big is big enough? How much larger of an engine can be built without jumping the cost of the buildup through the roof. I know if I move from small block to big block that the cost will go up due to the cost of big block heads being higher.

Any input is appreciated. Thank you for any and all replies.

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Old 09-29-2008, 08:06 PM
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IMO "532.5 to 656.75" horsepower is pretty ambitious for a small block!

IF it were me, I'd be looking at a blown big-block with those kind of numbers in mind.

Chevy High Performance Magazine has a pretty interesting article on doing just that.
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Old 09-29-2008, 08:08 PM
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i have a 671 supercharged 350 in my 67 camaro and i'm happy with it. Boost makes up for cubic inches....and a small block with a blower sticking out of the hood is way cooler than a big block without a blower sticking out of the hood I'm finishing up my new longblock now and once I get it in i should be at around 650 horse with 15lbs of boost
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Old 09-29-2008, 08:13 PM
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Quote:
Originally Posted by 66GMC
IMO "532.5 to 656.75" horsepower is pretty ambitious for a small block!
Keep in mind those are numbers from an article I read somewhere. Car Craft I believe. But the theory is sound. Those numbers would be flywheel horsepower since they just use an engine dyno and don't compensate for drive train loss. But any which way you dice it. That is a lot of ponies.
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Old 09-29-2008, 08:17 PM
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i guess i might as well post my car

http://www.youtube.com/watch?v=Ij0KIG5Ld2E
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Old 09-29-2008, 08:19 PM
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what kind of power are you getting out of that thing? Weiand 6-71 right?

I've become a fan of centrifugal superchargers. I've seen then do amazing things.
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Old 09-29-2008, 08:24 PM
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Quote:
Originally Posted by darkostoj
Boost makes up for cubic inches...
You said it. My current fun toy is a Mitsubishi 3000GT VR-4. Not exactly a muscle car. But the 3.0L V-6 Twin Turbo makes up the smallish displacement.(compared to a hot rod)

400 all wheel horsepower makes for a lot of fun.
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Old 09-29-2008, 08:29 PM
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My 69 has a 468,14-1 compression,710 lift cam and a 1050 carb,and loves to eat blower car's . alot of guys are not willing to run enough boost to make the big power,But I love a big block with a big ole blower sticking out of the hood too, IMO,you get beat cubic inch's! BUT,Its your car,your motor,your money,you need to build it the way you want it, so when your done you can look at it and say "that's what I'm talking about" !
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Old 09-29-2008, 08:35 PM
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Quote:
Originally Posted by Muni
what kind of power are you getting out of that thing? Weiand 6-71 right?

I've become a fan of centrifugal superchargers. I've seen then do amazing things.
well i have to say i'm not a fan of centrifigal's. For me the only real options are a roots, or a turbo. If I didn't love the way the 671 looked, and if it didnt perform so damn well on the street i'd go turbo.
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Old 09-29-2008, 09:22 PM
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Supercharge it. You won't be disappointed.

Where in Washington are you from?
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Old 09-29-2008, 09:37 PM
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http://hotrodders.com/journal_photos...1433228311.jpg


Just somrthing about it. HG
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Old 09-29-2008, 09:50 PM
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OK, you seem to be pretty much decided ... but did you even read the article?

620 HP / 500 TQ out of an UNDERDRIVEN 8-71, a cast crank, stock rods, iron heads.

Forged pistons, blower cam, ARP bolts, bigger valves ... that was pretty much it, other than the blower, intake, and carbs.

About $5,000.00 all in.

What's a 600 HP small-block going to run you?
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Old 09-29-2008, 09:56 PM
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Quote:
Originally Posted by 66GMC
OK, you seem to be pretty much decided ... but did you even read the article?

620 HP / 500 TQ out of an UNDERDRIVEN 8-71, a cast crank, stock rods, iron heads.

Forged pistons, blower cam, ARP bolts, bigger valves ... that was pretty much it, other than the blower, intake, and carbs.

About $5,000.00 all in.

What's a 600 HP small-block going to run you?
i dont know about 5k. Its going to be a little more then that. the carbs they used are about 1k, the blower kit for an 871 is around 3500, then you need the motor which i'm sure he doesnt have so he has to buy that, get new parts for that and machining, then ignition, fuel system, blah blah
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Old 09-29-2008, 11:24 PM
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whoa whoa. I'm not saying I'm looking for a 600hp small block. Not trying for something ridiculous here. It can and has been done. But it won't be done by me. I'm not trying to reinvent the wheel. Just figure out what direction I'm going.

The point is I'm still undecided on which direction I want to go. I'm starting to think I'm just going to build up my 355. Non supercharged for now. Once I save up a few pennies I'll get a supercharger for the motor. Along with some new pistons and a cam to work with it.

I'll see how I feel about the power I have at that point and move on from there. My eyes are starting to hurt from all the reading I've been doing. I spent hours grilling people on engine builds at the drag strip last weekend.

I'll probably change my mind a hundred more times this week but next week I'm starting a build. I'll either be ordering the rotating assembly for my 355 or a new "block".
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Old 09-29-2008, 11:24 PM
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Quote:
Originally Posted by Blazin72
Where in Washington are you from?

Near Yakima Wa. Central WA area.
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