Heads

[rryanwswan69]

This is my current setup 98 non supercharged bottom end with 04 non supercharged heads and intake manifolds wondering if i can bolt up L67 heads without modifying or if i do what i need to do

[l67ss]

Are you wanting to supercharge it?

[rryanwswan69]

It is turboed

[l67ss]

To answer your question youd need intake, gutted m90 and fuel rail. Youd end up with less power in that swap. The only difference between l36 and l67 heads is the injector location. Your series 3 n/a heads will out perform any l67 head

[rryanwswan69]

Ok gotcha damn i had a deal on some stage 4 zzp ones so I would be better off porting mine then

[l67ss]

Yep You already have a head start with the better ports and larger valves of the s3 heads

[rryanwswan69]

Now what about the lower end the rods and pistons people are telling me I should upgrade to l67

[l67ss]

Only dif in those is compression height and pin center distances. Would also lower hl(and increase turbo lag). Same quality materials. On a comparison, an s/c topswapped l36 hp is roughly equal to a 3.5 pulleyed l67.

[rryanwswan69]

So I should be good then with my setup get the heads ported and some plogs and e85 tune on top of everything else

[l67ss]

Mebbe a dif cam or higher ratio rockers. In your case(turbo) id do rockers as youll have less boost bleedoff

[rryanwswan69]

Already have st5

[l67ss]

You dyno it yet?

[rryanwswan69]

no since i bought the car in sept it has been sitting lol and getting worked on

[l67ss]

Would love to see the #s when you do dyno it

[l67ss]

What tb you running?

[rryanwswan69]

Yeh I will probably post them and a nstar

[l67ss]

Sounds like you have the bases covered. Keep in mind that e85 will really cut down your gas mileage

[rryanwswan69]

Yeh I know it will lol but with a good tune should still not but to bad