MY91Y84

i know that the ports are .1 higher on the LT4 heads but what about the floor of the ports?..are then the same height?...im asking becasue im puttin my LT4 in my caprice and i need a LT4 intake, only problem is that gm doesnt make them anymore...so im not getting rid of my LT4 heads so i want to know if my LT1 intake will work with some work to th e ports

Joe B

Im pretty sure that the LT-4 heads are not a completely raised port (like many assume it is), but just the rasied roof........this is what was explained to me some time back by a reputable engine builder when I was considering purchasing a pair...........

MY91Y84

so basically the LT4 head port is just a little taller..so using the LT1 intake wont really disrupt the airflow jsut slow it down a little due to the velocity factor going from the LT1 intake port to the larger LT4 head port..

EastLa

The angle on the plane where the head and intake meet are different if I remember right.
Sucks that they quit making LT4 intakes... guess they'll shoot up to prices of Minirams now.. Sounds more and more like a LS2 swap for me.

97WS6NY

I know lloyd can have a LT1 intake machined up to run on LT4 heads.

GOODZ/BADZ

I'd definetly have the intake port matched to the heads cause you don't want a nasty vaccum leak.

roughneck427

Yeah the intake will fit right above each runner you might have to weld up the intake for the material you remove its just the roof of the runner is raised my porter was going to port my heads to LT4 gaskets and i was going to have to weld on the intake and i said **** on that i was on a budget and wanted to get my car done

Injuneer

No, the angle is not different. The difference is that the cast part of each LT4 intake runner is taller, causing an interference with the valve cover rails on an LT1 head. Going the other way, putting an LT1 intake on an LT4 head will not have the valve cover rail interference problem. But it might need material welded to the top of each runner so it can be opened up to match the taller ports in the LT4 heds.

SS MPSTR

The LT1 intake will work on a set of LT4 heads. It's not optimum, but it does work.