2xLS1

iTrader: (25)

I'm an installer who feels caught in the middle between an unhappy customer and an overly optimistic parts vendor. Take a look here to see what I'm talking about.
https://ls1tech.com/forums/dynamometer-results-comparisons/193964-opinions-please.html

Would you be happy with these heads? Here is what MTI says about their heads:
Stage 2E Cylinder Heads
Complete hand porting of intake, and exhaust runners for excellent flow volume & air speed with major bowl work performed. Ferrea 2.02" stainless one piece intake valves, and 1.56" exhaust valves are used in the factory valve seats. High performance dual valve springs coupled with our custom lightweight titanium retainers and specially machined spring cups offer the most stable, and reliable valvetrain. These heads can be milled .030" to increase the compression ratio by 1/2 of a point. This is an excellent street cylinder head with flow numbers exceeding well over 300 CFM on the intake runner and 210+ on the exhaust side. Each set of cylinder heads will come with their own individual flow sheet. If you're looking for a great cylinder head at a great price, look no further. Available for LS1, LS6, LQ9 and all 5.3L truck castings. See the flow sheet attached to this page for flow data.
And here is the flow sheet on the heads.


I'm not trying to bash MTI here as I recommended the customer buy their heads when he decided he could not wait for a set of AFRs to be available.

2xLS1

iTrader: (25)

So no comment on the head flow #s eh?

bad2000ss

iTrader: (6)

After reading the other thread, I can't understand why he is complaining. He picked up almost 100rwhp from the heads and cam install. 2xLS1, looks like you did a decent job setting the car up. If his car started with 350rwhp, then sure, there might be a problem. 284rwhp to 381rwhp is pretty damn good for a 224/220 .560/.580 camshaft and heads. Perhaps MTI figured your customer's car would dyno in the 300-310 bone stock, as many LS1 powered cars do, which is why they told him 400rwhp was possible.

Just like everyone in the other thread stated. Take the car to the track and see what happens.

Sam-eye-Am

iTrader: (2)

I think a 100rwhp increas with a stealth cam and heads is pretty acceptable.

2xLS1

iTrader: (25)

The problem lies with what MTI is telling him his car should dyno. I think the car is where it should be. I feel that if he has any legitimate complaint is in the actual head flow #s vs their advertised specs. But the heads are on the car so what are you going to do? I guess you have to be in the middle of this to understand.

bad2000ss

iTrader: (6)

Have your customer call MTI and ask them what the average increase they see in a heads cam package install. Rather than go off of MTI's 400+-rwhp figure, have them give your customer an average rwhp increase. Perhaps your customer will be more content knowing the increase that he recieved is average to above average. No doubt your customer has one of the lower dynoing(sp) LS1's in stock form.

Scalpel

iTrader: (4)

I agree, a 100 RWHP increase is pretty sweet.

Your customer shouldn't be too hung on the end dyno #s, rather the big picture = 100 RWHP gain.

PREDATOR-Z

I'm getting ready to put my S2 on but awaiting AFR's. i'll post my dyno once it is done. But yeah for a Vette 28x rwhp base is weak IMO. I dynoed 298rwhp stock.

So 100rwhp gain through H/C is within the norms. Colonel dynoed 420 but with true LS6 castings and some other mods.

Also Colonel grind is a custom prototype XE-R Comp grind 224/220, .581/.581 116lsa while MTI production cam is a LUNATI 224/221, .576/.581 116+4lsa.

Him and i are just having this discussion that the 2 cams are slightly different.

csmts

I don't think you got all of the mods that was made on this 04 vett. Here are all the mods, FLP long tube headers, magnaflow cat back (no cats), MTI S2E heads, MTI stealth 2 cam (224 220 576 581 116 lsa), K&N air system, ASP pulley and tune. Bone stock it made 289 and with the mods now it makes 381. Do you still think the heads and cam is making what it should???

CHRISPY

The head numbers are lower than advertised but the variance could be in the benches used.

I think he is wasting his money going for a different set of heads. Most I would do is a camp swap.