ls build advise

[71RS/SS396]

The LSA blower manifold will not work with 243 heads. The LSA has square port heads, the 243 heads are cathedral ports.

[badazz81z28]

Originally Posted by 71RS/SS396

The LSA blower manifold will not work with 243 heads. The LSA has square port heads, the 243 heads are cathedral ports.

Not only that, you can't put the Rect port heads on a small bore engine. OP, you might want to re-evaluate the build.

[71455Formula]

I saw someone has the rectangle port heads for the small bore motors. Can't remember who though.

[71RS/SS396]

Originally Posted by 71455Formula

I saw someone has the rectangle port heads for the small bore motors. Can't remember who though.

Mast did have some but I don't believe they make them anymore.

[Jr]

I read on another forum that you can fit rectangle port heads on a small bore motor if you run smaller intake valves. Understand that I read that somewhere, I have no proof that it works.

[badazz81z28]

Originally Posted by Jr

I read on another forum that you can fit rectangle port heads on a small bore motor if you run smaller intake valves. Understand that I read that somewhere, I have no proof that it works.

Where would the benefit be? Massive flowing heads with little valves. You couldn't take advantage of them. I would suggest a killer set of LS1/LS2 heads.

[71455Formula]

Found them.

http://www.racingheadservice.com/rhs...r-ls1-ls2html/