I have a ‘73 XR-7 with a 4BBL Holley carb on a 351C. The serial number on the front is 4777-7. Production date 11/71. Any recommendations as to which rebuild kit I should buy? Thanks in advance.
Aftermarket carburetor. I would google “Holley 4777-7 rebuild kit”. Original Holley kit would be preferred.
So far as I know Holley does not sell a rebuild kit. You can order the parts separately that you need. Needle and seat assemblies, gaskets, accelerator pump diaphragms, secondary diaphragms - all sold separately.
The rebuild kits from NAPA etc are crap quality - stay away.
Check here on Holley’s web site
The 4777 is a 650 double pumper, which never was equipped on any Ford product from the factory.
Holley has sold rebuild kits for ages. They offer a Renew Kit, with the basics to rebuild. They also offer the Trick Kit with tuning parts - which is now quite pricey. The part numbers for those are 37-485 and 37-933 respectively.
I’ve had excellent results with carb kits from Allstate Carb. They use mostly genuine Holley parts at a much less than Holley price.
1 Like
Those seem to have everything but the secondary diaphragm which will not be needed on a mechanical secondary double pumper.