I wouldn't bother with the bigger valve springs either. Toyota designed the 1G as a fairly high reving motor and I am sure the springs were sized accordingly. Your better off sizing a turbo to make better power at lower revs than reving the ass out of it anyway.
Cleaning up the exhaust ports and matching them to the manifolds will help with turbo spoolup.
Cleaning up and match porting the inlet side will see a small increase on a turbo engine, but don't expect the same sort of gains you would on a N/A engine.
If your doing the work yourself, go for it.
If your going to pay someone else for the head work, then you would see better gains with ecu/turbo/cam upgrades. (in that order too.)
Tue, 05 October 2004 11:04
