Originally Posted by hambone

Now where was i? Not accepting defeat i tore the USA down and to be honest didn't really see anything out of the ordinary except low compression. As i stated before the new p/s/r assembly i bought from rb had the least amount of metal pinch new than anything i ever bought. I found that the newer piston fit very snug in my old original sleeve, really snug. After a lengthy conversation with Neal at Clockwork he suggested the block may have a hairline crack so i swapped it out with a spare block i had. This was one of the tightest engines i've tried to start. My ofna blue box with a pair of lipos really struggled. Took a while to break it in. I even took the speed carb off and went back to my fms carb(can't seem to locate the rb carb at the moment). Both carbs look identical. After break in i leaned on it a little and had the carb setup identical to where i raced the fms. It's manners are perfect. I ran tank after tank without shutting it off. Always idled nice, never leaned out and will do full throttle to full stop to full throttle time after time and never act up. Damn block was cracked. I didn't put any sealer on the engine and i still have the P4 plug in it from the race Sunday. I want to thank everybody for their help and suggestions. Sorry to Chris Peralta for aggravating the hell outta ya, lol. If anybody has a spare block they want to sell pm me please. The one i'm using had the locater pin broke off for the sleeve and a new one is in not in the original location causing me to put a new notch in the sleeve. That's a pain.