tommycompton

iTrader: (1)

Maybe you're thinking ls3 heads on an ls6, which I don't think can be done because of bore size. But you can put ls3 heads on an ls2?

HtownV04

iTrader: (1)

There are small bore LS3 heads, I think.

philistine

iTrader: (2)

Well this makes me feel a little better if I decide to pursue a cathedral port Eforce. I was under the impression it would have limited applicability for the LS1/LS6 engines. I didn't know AFR made cathedral port heads for the LS2.

ryridesmotox

AFR, Trick Flow, mast, and maybe TEA if i recall, all make LS2 cathedral heads. The LS2 used 243s anyways. They are the same as is on an LS6.

ryridesmotox

The exhaust valves are different or whatever... Otherwise, same casting.

Pray

iTrader: (7)

I had a brain fart on the gaskets. They looked wider like the LS3's. I should know this, I port manifolds all day for my side business.

The LS3 heads will fit on an LS2. They just need a 4" or larger bore. Once you go past a 2.08" intake valve you are shrouding it on a 4" bore though. LS3 heads are a good way to drop compression and step up to more intake flow especially if you are going to run a PD blower to make up for the runner size.

The 243 Z06 heads have different exhaust valves than your normal LS2 243/799 heads.

I think this will be my next power mod after some bolt ons and cam. The suspension/clutch stuff will be addressed first for my V though. Thanks for the reply.

Pray

iTrader: (7)

Can you separate the lower manifold and snout from the rest of the blower? Just wondering if it would be possible to port these pieces to get more air in and out. Just wouldn't want to get anything into the rotors.

tommycompton

iTrader: (1)

Pretty sure you'd have to take the top off, remove the Intercooler and the back plate to remove the rotor pack. The intake runners run to the top of the blower where the Intercooler is located. You could stuff rags in the long intake ports, for a port matching. Not sure how much you would gain from the work, same as porting heads on fi. Probably not going to yield much gain as it would from NA. I wouldn't bother paying for it, but if you do it yourself may be more worth while.

Pray

iTrader: (7)

Thanks, I do porting as a side business so it would only cost me my time and materials. I have done my last two sets of heads with good results. I didn't realize it had long runners. If I couldn't get to the complete runner it may not be worth it unless it necks down some where I can reach and either re-taper it or open up the cross section. I know the ported blowers on the Cobras, V2's, ZR-1's, and ZL-1's make good gains. I am also curious to see what the path leading into the runner looks like. There may be some work that could be done there from the casting and machining process. Opening up the snout can also yield some gains when you are getting to max potential of the head unit. I am looking to make 850+rw when all is said and done.

2007V

iTrader: (2)

Hi Tommy,

I was curious if you've dyno'ed this yet and what power are you making? I'd like to swap in a set of LS3 heads to drop the CR for this eforce. Would the LS7 part number 22-15403 be the correct one for that?

Thanks!

tommycompton

iTrader: (1)

Haven't taken it in for a dyno run yet. By the time I got it done I figured I'd do a couple more things over the winter while its parked, before going in. Plan on doing an active inter chiller, adding some maf honeycomb straightener, and some other small odds and ends before I go for a tune.
As far as part numbers I ran an ls2 cathedral port, so I can't say what the ls7 numbers would be.

2007V

iTrader: (2)

Man, get that thing on the dyno already!

Thanks for the info, I'll check he numbers with Mike.

tommycompton

iTrader: (1)

I know this lol
Only a couple tuners around here and they are so busy by the time I got it in, it would be time to park it for the winter. So I figure do some other little things I've been wanting to do, so I don't have to pay for so many dyno sessions.
Running a return and fpr is high on the list.

2007V

iTrader: (2)

That would make the MAF tuning way easier. Not sure that it would get you a whole lot if speed density though.

tommycompton

iTrader: (1)

I'll be leaving that up to the tuner. The last time I went in they were doing a maf tune, and he had mentioned my maf readings were all over the place.
So this time I'll be prepared.

1BADCTS

iTrader: (17)

I've been getting MAF related trouble codes lately. I need to look into it just haven't had time!

2007V

iTrader: (2)

I get a MAP out of range at part throttle CEL sometimes. I assume it's from it being boosted but haven't found the right table to update yet.

tommycompton

iTrader: (1)

Long over due update!!!
Car is done its initial modest tune
600 rwhp with a 3.25" pulley
Tuner said he could have easily gotten 30 more hp out of it, but keeping it in the safe side. Have to still break in my clutch and diff, so couldn't really push it in the dyno.
Once that's broken in and I start think of tranny upgrades, I'll pulley down. I have a 3" already but I'll probably grab a 2.75" and think about an overdrive crank.

2007V

iTrader: (2)

Awesome, great numbers! I have a bunch of questions.
So that's a camaro snout on a ls2 vette kit? Stock cubes? What boost pressure and iat2's are you seeing with the 3.2 pulley?

Edit, I'm curious what your timing is as well
Thanks!

tommycompton

iTrader: (1)

It's the same head unit that is sold from summit and jegs ect. As their tuner ls eforce. Corvette belt offset. Part number is listed in the parts list I posted.
I don't have all the details on the tune, I pick up the car tomorrow.
Stock cubes, beefed up internals, lower compression.
When I get her I'll find out the details, boost will be unknown until I hook up my gauge.