Are there two diffrent size front pumps for c4 pan fill and case fill ?

the reason i ask i just got a factory c4 to 429-460 bell housing and it does'nt fit eith c4 i have they are both case fill this thing has a way bigger bolt pattern than mine the part number is rf-d50p-7976ba any ideas ?

Come on Richter i know you know

pumps are the same, to use the factory bell the case must be pan fill, the bell bolts to the case rather than sandwiching the pump like the case fill units do.

Thanks man i knew you would know good i'm glad i bought it then it was only 125 shipped.

with the case fills you gotta use the ultrabell deal, it will work on either type case.

Thanks I'm glad i got it anyway i love that old ford factory swap stuff like using ford 300 6 cylinder rods in a 351w to get more cubes out of it and the old pair of finned cast aluminum mt valve covers for a small block ford i got last week for 25 bucks that were hanging on someones garage wall for years.