Inliners International Forums General Discussion Engines GM 4 cylinders 151 153 181

Thanks. The flat one is the forged Ross. I got them from Tlowe. They are the .040" over 250 pistons that he sells. The other one is from a set of 307 V8 pistons that I thought would work but were too short. This engine is a .040" over 153 with a 181 Mercruiser crank and rods. That gives it a .035" stroke for about 175 CI. I'm happy with the near zero deck height with a stock block. I am also happy with the valve cover. My son did a good welding job. I still have to do some grinding and possibly filling to finish it.