B&M 420's
#4
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Join Date: Jan 2006
Location: wisconsin
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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.
#7
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how well would the 420's work on my 540's if I pulled the EFI
#9
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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.
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.