My question is about a flywheel. A Friend of mine is currently running a pinto torque converter behing his 351c with a c-4. the converter is a 10 in converter. the converter has a smaller bolt pattern on the flywheel then a regular small block torque converter. An old man told him of this combination and gave him a flywheel that works. the problem is the flywheel has no part numbers and we are tring to find another one for another car. the combination in his car really does work with a stall speed of about 4200 rpm. i was told ford used that flywheel for the small converter in police cars to give them more stall.any help is appreciated