Any recommendations or comments on this kind of setup? I just picked up a complete kit (used) with two big turbos and manifolds for a SB chevy. It is old, and was set up with the carb upstream of the turbos (not blow thru.) I'm planning on using this in a 455 with a performer manifold and 1970 heads, converted to FI. Any recommendations on a cam to run? It's going in a street speedster ('liner with lights) project.
From the research I have done you have to keep the overlap to an absolute minimum, and a .500 lift (or less) cam is fine, since the turbo boost will give you the increase in flow that you would otherwise need a high lift/long duration cam for. Look through a few cam company catalogs (TA, Crane, etc.) on the net and you will be surprised at how small the turbo cams really need to be compared to a cam for a naturally aspirated motor. Study the specs on the Buick turbo V6 camshafts too. Also, make sure you have a good set of valve springs. Springs that may work fine on a standard motor might not be strong enough once you add boost. Hope this helps, Randy
he is correct about the cam. don't forget to port the exhaust side of the heads as they do not get help from the turbo's like the intake does and make sure that you use at least 1 3/4 primaries on the headers
Get rid of the Performer intake. You need to go with a single plane intake to get proper fuel/air distribution under boost. Go with an SP1 intake at a minimum.
Is that really true? Only reason I ask is because I thought the same thing and entered a single plane into my engine dyno program and it shows absolutely no gain with single plane. but don't get me wrong I thought a single plane should do better under boost as well. can you please go a little deeper into that?
