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Old 07-06-2008, 01:09 AM
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671 Blower Pulleys...Help pls!!!!!!!!!!!

ive got a 36 & 32 tooth pulleys for my 427 Chevy. Does the 36 on top make it under driven????? I,m running a fine line at 9.8 compression, or can i keep the 32 on top?????? thanks Marty

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Old 07-06-2008, 01:41 AM
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That must be a 1/2" pitch pully, placing the 32 tooth on the blower will give you +12.5%, the 36 on top should be -11.

12.5% overdriven with 9.8 static c.r. will put your effective c.r. through the roof, without calculating it, i'd estimate 14 or 15:1 easily.
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Old 07-06-2008, 09:36 AM
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671 Blower Pulleys......Help pls!!!!!!!!!!!!!!

Thanks......well that sucks bigtime!!!!!!!!!!!!! My friend Neil races a blown 30 Ford on the Nostalgia circuit. He said big pulley on top for under driven. Now the 36 pulleys centre hole is to big & the 32 pulley centre hole is to small to fit over the belt pulley...........guess theres more machine work to do!!!!!!!!!!! Marty
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Old 07-06-2008, 09:58 AM
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You could always try an MSD BTM to pull timing out but that's a lot of cylinder pressure for a non-O-ringed block when in boost. I see guys claiming big OD on their street blower motors, and huge boost numbers for turbos on the street, curious how they work out.
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Old 07-07-2008, 01:22 AM
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Your right about the boost & compression...got no choice i guess! the 36 on top & 32 on the bottom. I never really drive the truck hard anyways....can,t afford broken parts!! Will keep you updated......Thanks
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