Good news to me, after all i do not intend to race the car...The 425 now has the camshaft from the 500 that superseeded it in the original car, as before mentioned the previous owner ran this engine on E85 with EFI managed by MS, it then had the #3 camshaft from MTSkiwicar wrote:Hi
Cooling should not be too much of an issue, I think you should easily make 350 to 400 bhp but at such low revs that the friction losses will be low and therefore heating of components like wise will be low. The rad out of a 350 chevy or a 302 ford should be more than enough, the one for my chevy was only 24X13X 2.5 inches and that was to take 550 BHP
Your choice of cam may be tricky to get the best out of the combination but even there somthing close to standard but with extra exhaust duration and lift should be ok.
Good luck
Mike
http://www.500cid.com/cams.htm
and produced some 270 hp according to calculations used by SAAB engineers, I reckon this is what i too will install in the future.
The 425 is the same engine as the 472 and the 500 but considerably less heavy which is my reason for choosing it...