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Old 08-24-2012, 11:59 AM
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Change blower pullys

I have an early 2 bolt main 355 sbc from big al's toy box. It's been a good engine but I'm wanting "more power". Right now the drive pulleys are 30/36 and I'm thinking 30/33 or 30/34. Would it be a good idea? Would there be an appreciable power increase? Still run on 91 octane?
The heads are 1.94 and 1.60 valves. Should I get some AFR aluminum heads?

Thinking bout swapping it into my 41 Willys which has a n/a 355 hopped to the gills. 2x4's on tunnel ram, big comp cam, 11:1, etc turning 12.4's @ 107. U know the old saying, what's a Willys without a blower. lol

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Old 08-24-2012, 12:12 PM
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blower make a lot more power if the exhaust ports are opened up.Old 1.94 heads wont breathe enough for big power.If your budget allows better heads then get them.Maybe a camshaft?what exhaust system are you using?
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Old 08-24-2012, 12:24 PM
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blower make a lot more power if the exhaust ports are opened up.Old 1.94 heads wont breathe enough for big power.If your budget allows better heads then get them.Maybe a camshaft?what exhaust system are you using?
Headers are 1 5/8" fenderwell through flowmaster 10's. Like the AFR heads with big flow 220? runners. Is there a nice "lumpy" cam for a street driven blower? Want my cake and eat it too! lol
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Old 08-24-2012, 12:42 PM
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You can have a little bump to the idle.If you upgrade the heads,then pick the cam.The lobe separation angle is usually quite a bit more than a low CR n.a. car. New heads and camshaft will likely add a lot of power,make sure the power train is up to par. If you have a local blower guy around,drive to his shop and ask questions with car in hand.

If a cam adds 30 hp to a normally aspirated engine then a blown car will likely get 50,and if heads add 60 or 70 HP then the same blown car will get 100. If you make a mistake then it too is 1 1/2 as bad. To add 100 plus hp to your car you will also need,,,,,? more of the other things too,,,fuel/air/exhaust/strength/traction
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Old 08-24-2012, 01:29 PM
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What's the static c.r. for the motor you plan to boost? Keep in mind, when you increase boost you also increase effective c.r. substantially. Here are a couple of data sheets to explain it and show where you would be at.
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Old 08-24-2012, 01:59 PM
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What's the static c.r. for the motor you plan to boost? Keep in mind, when you increase boost you also increase effective c.r. substantially. Here are a couple of data sheets to explain it and show where you would be at.
The engine specs were lost some time ago. If memory serves it was 7:5, maybe 8.
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Old 08-24-2012, 04:30 PM
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If it is that low, it's a good candidate for boost. If you can get the type piston, dish, flat, etc. and volume dish or dome, bore size and cylinder head chamber volume, compression height and gasket compressed thickness, easy to compute static c.r.
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Old 08-24-2012, 09:10 PM
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Blown Willys is nice combination. Light weight and lots of reliable power. Mine will go 0-60 in 3.6 in drive and just step on it.....also have it throttle stopped at 3/4 throttle.

8 psi boost mas if you have alum heads, mild cam and 8-8.25 comp.

I've got just over 20k miles on mine and drive it 3 seasons.
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