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Hi all. I've recently rebuilt a 2.6l engine for my gh sigma turbo and Ive decided to keep the standard carby setup on it. I started it up the other day and took it for a drive and it seems like it's gonna go great but it could do with a tune up. Is anyone else running this setup? Is there much diffe...

the setup in the car is stock except for the 2.6l. When the motor was rebuilt it had flat top pistons put in it which of course gives it more compression. What is the best head to use? Can you get the big port head to fit the inlet manifold of a turbo sigma? I want to try and keep the car as close t...

Hi guys Im new to the forum and i own 2x Sigma turbos one is a peter werrett special with a vr4 engine it was featured in issue 141 of hot 4s and the other is number 81 of 500 a genuine sigma turbo. I have a slight problem with this car i recently put a 2.6l engine in with the combustion filled up w...