On the clock

I’ve never experienced measurable gains regarding the exhaust position. Bob is correct the one on the right is preferred. I would imagine if it made a huge difference they would all be indexed the same way from the factory.

Ron

Thanks for all the input,
I can mount a good (new) cylinder/piston on various crankcases and see how it runs with various exhaust port positions. I'll use a non SPI cylinder to eliminate that variable. I don't know if anyone else has done this but curious minds want to know. Time to make some noise!

Strangely, many of my old stock 049 engines (some Tee Dees and red postage stamp backplate reedies ) came with the cylinder orientation shown on the right...as if COX had intentionally set it by either cutting the threads on the cylinder and crankcase to align the exhaust ports perpendicular to the crankshaft or, by manually selecting the parts to get this positioning...even the graphic images in catalogues and manuals show such cylinder port orientation..but later engines came with random exhaust port position relative the crankshaft..so even if COX initially wanted to boost engine output this way, they may have realized the negligible impact and given up he right angle  orientation to the cost cutting benefit by letting random setting occur ..

The cylinder/case on the right is terrific for cooking your fingers when your adjusting your needle.