Do rectangular port heads fit LS1 blocks?
Thread Starter
Joined: Apr 2005
Posts: 4,085
Likes: 1
From: N. Falmouth MA
Do rectangular port heads fit LS1 blocks? The rectangular port heads.. Those are for a 4.00"+ bore, right?? Wondering if I can do a set of rectangular port heads on my LS1 block.. I'm a little behind on this subject. From what I remember, those were LS3 and LS7 heads.
Last edited by bayer-z28; Nov 28, 2010 at 06:59 PM.
Square port only work on 4.000+, LS2, LS3, L92 etc. Pretty much gen IV motors. They will also work on LQ4/9.
I think some other companies have started looking at small bore sqaure port heads as well, but none of them will be cheap.
I think some other companies have started looking at small bore sqaure port heads as well, but none of them will be cheap.
Thread Starter
Joined: Apr 2005
Posts: 4,085
Likes: 1
From: N. Falmouth MA
^ Yeah, exactly.. 
I'm finding that they are mostly on 4.0" and up bore blocks and engines. 4.06" LS3, 4.00" LS2 and 4.125" LS7. I'm just confused about the casting #'s other than 241 and 243's.
K.. Than answers it.. Thanx..
Was just curious.. I don't feel like dishing out obscene amounts of money for the heads to fit mine. I'd rather just go out and get an L99 block.
I'm finding that they are mostly on 4.0" and up bore blocks and engines. 4.06" LS3, 4.00" LS2 and 4.125" LS7. I'm just confused about the casting #'s other than 241 and 243's.K.. Than answers it.. Thanx..
Was just curious.. I don't feel like dishing out obscene amounts of money for the heads to fit mine. I'd rather just go out and get an L99 block. 
