B&M 420's

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10-08-2015 | 11:59 PM

#11

Bawana

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Joined: Jan 2006

Posts: 688

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From: wisconsin

Quote:

Originally Posted by MILD THUNDER

an 8-71, is 436 CID, and a 10-71, is 469 CID. A 420 B&M is 420 CID, 250 B&M, is 250 CID. A 177 weiand, is 177 CID.

I have seen 420 B&M builds make 1000HP on pump gas builds. A 420 on a 540ci, making 8lbs of boost, will still be much less overdriven, than a 250 blower, on a 454 making 5lbs of boost. Swapping from a 250, to a 420, is a huge jump in displacement. Going from a 420, to an 8-71, is not much at all.

Mild as usual, you are a cauldron of knowledge, and right on the money.

10-09-2015 | 12:20 PM

#12

MILD THUNDER

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Joined: Jul 2004

Posts: 11,332

Likes: 73

From: chicago

Quote:

Originally Posted by Bawana

Mild as usual, you are a cauldron of knowledge, and right on the money.

Thanks Willie! dan swapped from a stripped 871, to a stripped 1071, and was able to slow the blower from 3 percent over, to 3 percent under, and make the same 6lbs of boost.

10-11-2015 | 04:38 PM

#13

jamontes

Thread Starter

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Joined: Jul 2012

Posts: 276

Likes: 5

From: Fort Worth, Texas

Quote:

Originally Posted by Bawana

I have three on my boat now, was thinking of going to 10 71's. Carbs are primary & secondary boost referenced. Blowers were rebuilt & stripped 54 hours ago. If you PM me a reasonable offer I am game.

PM sent.