Sorry for lack of detail. Its a street car, I have a dedicated club/circuit R32 Skyline which is the impractical/fast car...so just want my Sierra to be a strong daily driver.



The above pic is the bus the engine is for. It The car is an 87 Sierra RS. It's suspension has been bushed with Koni Yellows, SCS 6 deg beam. Rebuilt T5, SCS built YB with 200 block, with Pectel T2 ECU, air injectors for boost control, SCS T38 and about 420hp. Runs 355mm 6 pot APs. So has the basic building blocks. The rest is a bit of a guessing match until i rip it down this weekend.

The main thing is the engine runs something like 7.4:1 compression. I would like to bump that up to around 8.5:1 and run about 25psi.

I would speak with SCS but now that me and the car are back in Australia going to have a got at it myself. Curious to know things like max bore for a 200 block without going to liners etc. Any off the shelf pistons with big enough fly cuts that allow you to run ~8.5:1 compression. The engine is meant to have headwork and cams but don't know the specifics of the cam lift. Will send them off next week to find the exact specs of duration and lift. Looking at them last week they have Ford logos on them so I guess that could mean they are std cams? It doesn't idle very angry and I think the head still have hydraulic lifters

So at present not looking at changing too much in the regards of head spec, cams or turbo (Unless it turns out that its all std) I have not terribly blown away/impressed by the T38 so considering changing the turbo to one of these http://store.forcedperformance.net/P...GT3076HTA.html

I should mention perhaps that Australian fuel its pretty easy to get 100RON fuel in my area so not scared to run some reasonable compression and boost.