I recently "Started" my jump into the high horsepower and high torque arena and I have some questions.
I purchased a QS-B1 and a B-2 to build a twins setup and was wondering what the best cam to install would be and which O-ring to use and which part (head, block, or both) to O-ring. My goals are 600 to 700 hp and I would like to keep my boost at around 80 psi WOT. I will be doing more drag racing than pulling and I want a streetable setup.
I know there are many things to consider when undertaking a project like this but I just want to do this right!
Any advise would be greatly appreciated.

Meacham Evins
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For 80 psi you will need a Fire ring setup www.haisleymachine.com for above 70 psi.

If you just want to make 600 hp then a single O-Ring in the head will work fine....that's what I run, no issues at 65 psi. You can make allot of power with that amount of boost, the right turbo's and setup properly.

Jim

 

Ditto on what Jim said. I went with the fire rings and they seem to be doing there job.

Horace

 

What Jim said. I would recommend the Fire Rings as well.

As for a cam, the Diesel Dynamics cam is probably the best on the market. Not all cams are created equal. The DD cam is quite a bit more expensive than others (pdr, EE, etc) and AFAIK, they have done quite a bit more R&D in this arena. I am also under the impression that the DD cam is much stronger than a simple regrind.

I am sure others know more abou the cam game than I do, but I have read a lot, and the consensus seems to be that the DD cam is the best, but also the most expensive by far.

Justin

 

600HP is cake now.

A single o-ring in the block or head and using the stock gasket will work to 70 PSI. 70 is plenty. If the o-ring is in the head...taking the truck back closer to stock level for re-sale is easier. If that even matters in the scenerio.

I always recommend the DD camshaft. Hands down. Piers cam seems to be working well in Nathans truck though. I just cant get past the durability of a bolt on gear VS a press on gear for the 600 plus crowds who race.
Too many things bad can happen if the cam gear slips.

There are several good options for all your questions and the opinions are wide ranging. Somewhere between pride in your finished product, real life tested performance, and a reliable, driveable combo VS overall cost is the answer. Looking toward the folks who have the rigs and set-ups with the real dyno and track proven performance is a good start.

Don~