While the OEM truck pan will fit into a Gbody, the sump may sit way to low and ground clearance may not be acceptable for some. For this reason, I chose to use the Fbody oil pain for my conversion. Most will recommend one of the Holley pans that are available. I can’t argue with that. If I did this swap into a Gbody again, I would likely use a Holley 302-1 or 302-2.
Because of the motor mounts and forward positioning I used, I had to notch the cross-member. It’s not structural, so cutting into it does not compromise the rigidity of the frame. Not all who have used the Fbody pan have had to notch the cross-member.
I chose LSX Innovations adjustable 1″ setback motor mount plates. I wanted to set the motor forward one notch as to have better firewall clearance. This was simply done by mounting the OEM Gbody clam shells to the plate as noted by the plate installation instructions.
The Fbody oil pan GM part numbers are:
Oil pan (5.62″ deep) 12628771 (SPECTRA PREMIUM GMP77A)
windage tray 12558253
dipstick tube 12551577
dipstick 12551581
oil pickup tube 12558251
gasket 12612350 included with pan
This Spectra GMP77A oil pan comes with the oil filter fitting installed that is M22x150 threaded. This requires a Wix 57502, ACDelco PF63, K&N HP-2011, Fram PH10575 etc. or equivalent filter.
Other pan comparisons:
