[zimmy]

Thanks all:

I went back under to look tonight and it does have the cross bolts and I think the number may actually be C4AE. This would all be good news as this would make it a '64 Top Oiler 427 which is what it is supposed to be. That takes me back to the original supposition.

Had the engine built 12 years ago by people that are no longer available. No build sheet to know what is what. Solid runner with a Holley 750. Couple of years ago I put Weber 48 IDAs on the engine and have not been able to get it right even with all of the high powered help I received on this forum, etc.

This past fall, I finally put it on a chassis dyno to be shocked to learn that it only had 250 HP!!!! Ran very rich even with small jets, constantly bachfires on decel. Only consensus has been that the engine must have been built with very low compression ratio for street gas. Explains all of the symptoms. It even ran rich jetted down with the Holley. Makes sense. I also seem to remember that the "crook" that built my car back then said something about the engine having a 390 truck crank for strength. What I really think it has is a 390 crank with 390 everythings which ends up with a low compression 390 in a 427 body (or something like that since a stock 390 is about 250 hp).

Anybody have any thoughts. I am planning a new all aluminum 427 at about 500 hp later this spring from C&C Performance in VA. Should solve the problem. It will run 10.5:1 compression which the Webers will like.