[speedo]

I am down to the short block and the reason the engine is apart is that the PO was frustrated with the engine after it was diagnosed with broken exhaust side head studs...repairs were made, but the engine never ran right afterwards. As I tore it down...the throttle bodies and intakes were opened to 40mm, the exhaust to 38mm. The MFI pump looks to be a stock 2.2 S injector pump. The cams are a turbo 4 bearing core ground to a Andial "modified S " profile. The case is a 930 case with a 70.4 crank. The heads have been flycut 3.5 mms to reduce the cc's of the combustion chamber. Everything looked fine until I took the cylinders off the pistons. Scoring on both at the 12 and 6 o'clock positions. I initially thought the scoring was due to detonation and poor cam timing. Now I am thinking the problem was the use of the Cosworth pistons in Alusil cylinders. The scoring looked like overheating due to detonation...but it also resenbles what might have occured if the "K" Alusil cylinders were used with the aluminum Cosworth pistons instead of Nicasil cylinders. Questions...anybody use the 95mmm Cosworth pistons back in 1990s...and were the ring lands the same as the Mahle RSR pistons. Were the pistons designed to be used with the Nicasil cylinders?
I have asked around to try to find the shop that might have been building these engines off stock 3.0 CIS engines, but no luck. The build list looks great...with the exception of the P and C combo. Help would be appreciated. I am looking for a twin plug 3.0 dizzie as the Electromotive HPV-1 this came with is going away.

Thanks

Speedo