which head to go with KB blower...?

will the kb bolt up to a gt40 lower? When i was looking at them the other day all of the ones i seen where on stock intakes.

Yes, the GT40 lower works with the KB, but you have to specify it when ordering. Dyno test have proven it to be worth 10 rwhp combined with the supercharger.

Mike

it should bolt right up

Well, by just looking at the specifications for both heads I would say the AFR's. They have the same size intake and exhaust valves and you can get them in the same combustion chamber size. The difference would be in the intake port volume. The AFR's are 185 cc's and the Twisted Wedges are 170 cc's. Since you will forcing the air in, I'd say you'll be able to flow more with the AFR's.

I would say that b/c the kenne bell is going to be able to stuff tons of air into those cylinders in the lower rpms...port velocity isnt going to be a big issue. Once you are into the boost...which is going to be almost immediately...you will have all the velocity you will ever need. I think the AFR 185's will work extremely well in this situation...however i would expect to see less than advertised boost numbers with such a good flowing head. But you will make big power...and BIG torque! sounds like fun!

90mustangfan said:

awsome, AFR it is, Im shooting for 400-430rwhp, and 500ft lbs TQ, on stock block with around 10psi and a type of methanol injection or is there a better way to keep the supercharger cooler with out methanol injection, Im looking for options on how to keep the supercharger cooler and intake air charge temps lower, so I can run more boost. any ideas

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Better look into options for holding a stock block together your going to be pushing the limits of it with those numbers
Awsome combo tho good luck to ya

90mustangfan said:

10psi and a type of methanol injection

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Contact KB regarding meth injection. I have read that they don't recommend someone using methanol with their superchagers because possible damage to the screws. However, this might be claimed to reduce warranty claims on their superchargers.

I used meth injection on my Magnuson "roots" supercharger with no problems, issues, or concerns.

Mike

This is an application where when it comes to choosing between AFR and TW heads that I'd choose AFR every time. Not because this head is better than that head or this one flows better than that one or any of those kinds of things.

The valve cover gasket surface for the TW heads sit roughly 3/8s of an inch higher than stock. This means that you will not be able to mount the blower with even stock height valve covers without running a 3/8 spacer between the blower and the lower intake. Running that spacer will mean that the snout bracket for the blower will need to be modified in order to fit properly. You'll need to either cut the top off the snout retainer and fab up a new piece of aluminum to enclose the snout or elongate all of the holes on the bracket so that the entire assembly sits 3/8s in. higher.

KB used to sell this modified bracket but don't anymore.

Rdrcr said:

Contact KB regarding meth injection. I have read that they don't recommend someone using methanol with their superchagers because possible damage to the screws. However, this might be claimed to reduce warranty claims on their superchargers.

I used meth injection on my Magnuson "roots" supercharger with no problems, issues, or concerns.

Mike

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The water/meth kits that are out there in kit form are not really designed for KB blowers. HOWEVER.... I've seen some really neat modification where folks have drilled and threaded the boosted manifold so that the water/meth injectors shot mist into that side of the blower assembly. It's a hell of allot more efficient and you're not squirting a water/meth mixture THROUGH the blower. IIRC, there was also a significant increase in the efficiency of the whole setup resulting from misting into the heated manifold vs. into the intake side of the blower.

This is the method I plan to use when I get to that point.

I think that KB, Snow, and Anderson are all missing the boat by not providing pre-fabbed kits, instructions, and drilling jigs for this type of setup already.

I plan to run 4 small nozzels spread along the length of the manifold, pretty close to where the boosted manifold meets the lower plenum. That way, no single clogged nozzel will spell the end of my motor due to being clogged.

Rdrcr said:

Yes, the GT40 lower works with the KB, but you have to specify it when ordering. Dyno test have proven it to be worth 10 rwhp combined with the supercharger.

Mike

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What is the price for KB that will fit my GT40 lower?

I don't think that there is much of a price difference in that regard. The price differences come in the displacement of the blower. You will however, have to purchase a GT-40 lower plenum if you don't already have one.

Check Kenne Bell's website for the price list.

I have a question concerning heads along with a K-B as well. I have GT-40 heads on my 93 Cobra, the guy I bought the car from was trying to run a Novi 2000 and kept blowing heads gaskets. I don't know how much boost a Novi 2000 makes but I have been hesitant in purchasing any blower with GT-40 heads. I did some snooping on the net and some peple claim the deck thickness of a GT-40 head doesn't lend itself to boost applications, and others swear they have run 10 psi of boost with no issues. I'd really like a KB blower but I can;t afford $1200 heads and a $3,000 blower at one shot. Also, milling my GT-40's to ensure a flat gasket surface would raise compression ratio's would it not?

I don't think AFR 185heads will fit with stock pistons unless you notch the valve reliefs.

I would run a ported version of the TFS heads you got more of a cam selection with stock pistons. They go .550 with stock V/R 's For 1,800 they have a full CNC with a .600 spring and a 65 cc chamber that will help in the boosted application

does your oil pan have more capacity than stock??? i have heard putting a HV oil pump on a stock pan is a bad idea. that the pump can actually suck the pan dry under high rpm

high volume is ok high pressure no-no, the high volume pump just has more body to hold more oil in it.