430-435 CHP now.....What can I do to get 500-510 CHP?

[Billy Mild]

We need a blower.

[Vette73]

Originally Posted by Billy Mild

We need a blower.

Yep we do......Everybody else has one....I saw a guy with a V6 Mustang have one....

[Billy Mild]

I have looked everywhere but have not found one yet. Also I don't know where we could put one unless we modded an intake and put it in the V of the engine. Delete the plenum and putting an E force supercharger in there. That would be awesome.

[Vette73]

They don't make one...From what I hear the compression is too high on the LT-5...Yet, than again with so much technology out there you would think someone would come up with one...

I mean every car you see out there is practically boosted.....Just basically bolt it on, modify your cooling system , a belt here and there and away Ya go...!!!

[Top Toy]

You can get close to your target without head work or headers if you Siamese your plenum and injector housings. I made 411 RWHP thru stock heads and manifolds. No loss of low end torque or drivability.

[Vette73]

Originally Posted by Top Toy

You can get close to your target without head work or headers if you Siamese your plenum and injector housings. I made 411 RWHP thru stock heads and manifolds. No loss of low end torque or drivability.

My car does have headers, one of the first things I did when I got it.....

My plenum, inj housings and air horn are ported by Pete....

What, if anything is Siamese porting?

How does it differ from what I have done already...

[XfireZ51]

Originally Posted by Top Toy

You can get close to your target without head work or headers if you Siamese your plenum and injector housings. I made 411 RWHP thru stock heads and manifolds. No loss of low end torque or drivability.

Dennis,

Do you think the siamesed ports even up the air flow between the two runners, or that it allows greater cfm?

[Top Toy]

Siamesing removes the partition between the primary and secondary runners. Answering Dom's questions, it both Increases air flow and balances flow between the two sides, although increasing air flow is the major benefit. Also eliminates the dead space in the secondary runner when your secondaries are not open if you haven't already eliminated your secondaries (also highly recommended). Vapors in the dead space coke in the runner and on the back side of the intake valve and make a real power robbing mess after a while.

Contrary to conventional wisdom, siamesing did not result in any loss of low end torque or drivability. Then adding headers (still stock heads) really woke it up! Didn't get to dyno it in that state, but conservatively estimate it at over 430 RWHP. 120 in the 1/4 on stock tires.

Now it's at Marc's finally getting the heads done and new cams. Stay tuned...

[XfireZ51]

Thanks Dennis. That's one thing I have not done on my intake. What would u suppose siamesing would add incrementally to a motor producing ~450rwhp?
Also, are you siamesing top and bottom of the injector housing, or just where it mates to the plenum?

[Vette73]

So basically when I sent out my plenum and I/Hs I should have been aware of Siamese porting? I'm guessing this should have been done when I originally had my porting done?

Or, is this modification have to be done in stages, and to get the most out of it, should the secondaries be relieved?

Juuuuuust a little confused....