[Trackrash]

Originally Posted by 75 911s

Yes I have Wayne's book.He has a recommended 2.7 upgrade and that is the 2.7RS spec which has 90mm pistons and the S cam with 40mm webers. My budget did not include the intake.

I was shying away from boring the cylinders because I was under the impression that a 2,8 or 2,9 would be much more expensive to build for some reason. If it isn't, maybe I should look into increasing the displacement, wont that help with low end torque after all? Better for a street car.

I have Ollies price list, but not sure what the total cost will be to ship, and do the case. I'm ballparking 3k. is that realistic?

My point is it depends. If you have Mahle nikasil cylinders that are in spec, it is a no brainer to go 2.7 with JE pistons.

However if your cylinders need to be bored, honed, or re-plated, I would go up to 2,8 or 2,9. No more money, since you have to have the cylinders redone anyway. You are already buying new pistons. IMO a 2,9 would be a dream motor, if done correctly.