Ls3 heads or ls9

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Feb 19, 2018 | 08:06 PM

427BBV8

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Ls3 heads or ls9

would ls3 or ls9 heads work on a lsa block and blower? Which would be best for power ported ls3/lsa/ls9? Thanks guys. And does anyone sell lsa fuel rails? For some reason I can’t post on the sale section

Feb 19, 2018 | 08:38 PM

G Atsma

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I would THINK LS9, only because they are for a blower motor too. They have a "wing" in the intake port that is supposed to promote swirl under pressure.

Feb 20, 2018 | 07:20 AM

KCS

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Quote:

Originally Posted by 427BBV8

The LSA and LS3 heads would work for sure, and I'm assuming the LS9 will. I know there are some differences with the LS9 heads, but I think it's mostly in the valvetrain and not really anything to keep them from working on an LSA block with an LSA blower.

You can't use the classified yet because you're not allowed to:

https://ls1tech.com/forums/user-supp...e-answers.html

Feb 20, 2018 | 08:44 AM

427BBV8

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Quote:

Originally Posted by KCS

ahhh I see thank you

Feb 20, 2018 | 08:44 AM

427BBV8

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Quote:

Originally Posted by G Atsma

I would THINK LS9, only because they are for a blower motor too. They have a "wing" in the intake port that is supposed to promote swirl under pressure.

i think ls3 heads flow better than lsa

Feb 20, 2018 | 10:50 AM

G Atsma

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Quote:

Originally Posted by 427BBV8

I think ls3 heads flow better than lsa

I was speaking of the LS9 heads. I wouldn't know about the LSA.

Feb 20, 2018 | 05:48 PM

427BBV8

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Quote:

Originally Posted by G Atsma

I was speaking of the LS9 heads. I wouldn't know about the LSA.

so so is it true the ls9 heads have valve guid issues

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Feb 20, 2018 | 11:37 PM

427BBV8

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Quote:

Originally Posted by G Atsma

Not that I know of, but I am not positive about that.

hmmm ok thanks man!

Feb 22, 2018 | 11:45 AM

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gnx7

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LSA and LS9 heads have the swirl bump in the port to increase efficiency and MPG. In actuality out of the box the LS3 head flows better. Once you fully port any of these heads they pretty much flow the same.

LSA/LS9 heads are rotocast with a better grade aluminum and weigh about 2lbs more than LS3/L92 heads

Only LS9 heads have Titanium intake valves