Hi all, i have recently fitted an st170 blacktop engine to my kit car. its running jenvey throttle bodies controlled by an omex 600 and im running the vvt using a motorsport electronics controller.

The head was ported and skimmed. i was under the impression that the skim was simply to make sure the head was flat but after it was done i found out the compression was increased from 10.2 to 11:1. apparently this is quite a big skim and the engine tuner was unhappy with the tension on the cam belt. The guy who did the porting off handedly said i would need oversize tension pullies and idlers to account for the change in dimensions.

has anyone heared of this or know where to buy these oversize pulleys?

i also seem to be having issues with oil pressure in that when running i dont get more than 30PSI at best