[mmcporter]

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A few thoughts...

First off, those are really good numbers! Has anything been done to the engine? Any idea what cam?

That HP peak sounds about right for an LS-6 through manifolds. Mine peaked at 5400, and somewhere earlier in the thread I think someone posted that's about the neighborhood it's supposed to be in. An L-72 peaks about 300-500 higher due to it's shorter stroke, but doesn't make near the torque the LS-6 does.

As for mufflers, skip the Flowmasters and go with the Dynomax units. I've got the part number around here somewhere, but they make an AWESOME muffler for the A-bodies that will outflow that Flowmaster and will sound TONS better as well. It's what I've run on my L-78 and my LS-6, and is what the majority of the Pure Stock guys run. If I can find it, I've got an unbelievable exhaust test done by the Buick club that raves about this muffler...

You are correct in thinking all the little things (carb, valve job, etc.) will help, as it all adds up. Be careful and get the original type Pertronix unit and not the later model. Trust me, you don't want the newer style.

Again, AWESOME numbers, and I'd love to see what that thing would do on the track!

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<font color="blue"> Rob,

Any info that you can send on the Dynomax mufflers would be great. I had Flowmasters on my '70 SS396 and was very happy with the results. If you have had BETTER results with the Dynomax, I am all for it. How loud is the resonation inside the car? I ask this because my LS6 is a 4.10 Posi M22 car, and at 60 it's plenty loud already. As for the Pertronix, I used the older style on the SS396 and was very happy with the results. I had heard the scuttlebut about the newer model. If you could dig out the info on that Buick test, that would be great. What size pipes did you run with the dynomax mufflers?

Thanks for the commentary and tips, I appreciate it. </font>