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3.9 400bhp

Hi, I have posted Q's on a 6BT site and was warned off a copper HG as it needs constant retorquing. I understand that a marine HG +20 thou with studs would probably be good for 50+ psi, I also asked about twins but no real knowledge came back apart from bottom turbo should be roughly twice the cfm of the top turbo so I was thinking HX30 top with HX40 bottom and as the HX40 flows about 2/3 of a HT3B it is probably in the right ballpark.

Gaza
 
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