Re: Lowering the 250's compression?
8:7 is ok at 10 Lp so long as fuel etc and spark/ timing is set right.But some unshrouding of chamber around valves lowers compression and helps flow...
ACL have a race series rebuild kit for ohc motors I guess they have them for X flows..Fit arp bolts and resize/ ballance assembly.I guess you could machine say 1/2 mill from centre piston 12mm from outside edge of piston to lower comp even more without weakening it...
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
Last edited by ebxr8240; 01-10-2004 at 17:35.