I read Bubba's site, and saw that a pan from a 351m/400 will work with a 351c, but what other pans can I get that will fit it? I am nearing the point where I need to get the motor in the truck, but it needs the pan. The DEP doesn't look to kindly on total loss lubrication anymore.

Jared

 

Are you sure the 351C pan fits the "M" blocks? The 351C has smaller
main bearings.

 

[updated:LAST EDITED ON 11-Dec-02 AT 01:57 AM (EST)]http://home.earthlink.net/~bubbaf250/
Last thing I knew, there was a cross reference in here with interchangable parts, can't seem to find it now.

Jared

 

I can't find the site either but I saved the text a while back.

Interchangeable Components in the 335 Series
Even though the M-block was relegated to smog oblivion by the factory, and even though the M-block has been mostly ignored by the aftermarket performance industry, the 351 Cleveland is well supported and the M-block has just enough in common that it can share several key performance enhancing components. Even though you may have heard otherwise, there are several excellent high performance options available for Ford's M-block.
When looking for M-block performance components or (more likely) performance components that can be adapted to the M-block, you need to keep in mind which of the 335 series (351C/351M/400) engine components are interchangeable.
Note: In the following table, components listed as 100% interchangeable are mechanically interchangeable between all 335 series engines (i.e., a direct bolt-in). But keep in mind that, even though they might be mechanically interchangeable, any particular version of a component may not be suitable for use in a specific M-block application.
Engine Component Interchangeability Comments
cylinder heads 100% interchangeable You can use any cylinder head from any 335 series engine on any 335 series engine block.

All 335 series engines share the same bore diameter, bore spacing, head mounting bolt locations and sizes, and block to head water jacket passages.
camshaft 100% interchangeable You can use a camshaft designed for any 335 series engine in any other 335 series engine.
timing set (crankshaft and camshaft sprockets and timing chain, or gear drive system) 100% interchangeable Timing sets are interchangeable between 335 series engines because they all share the same crankshaft to camshaft dimension and block front design.
valve train (lower) varies by component Valve lifters are interchangeable between all 335 series engines.

Push rods are not interchangeable between 351C and M-block engines because of different block deck heights.
valve train (upper) varies by component For non-adjustable, hydraulic tappet valve trains, almost all components mounted to the cylinder head are interchangeable.

All 335 series engines use the same rocker arm ratio (factory 1.73:1).

Rocker arms are not interchangeable between adjustable (solid tappet) and non-adjustable valve trains, unless the head is machined to accept the other type of rocker arm.

Some adjustable valve trains require pushrod guideplates and hardened pushrods.
valves some interchangeable The 351C 2V heads and M-block heads use the same size valves (2.04/1.66).

The M-block head can be machined to use 351C 4V valves (2.19/1.71).
pistons partially interchangeable The 351C and 400 pistons have the same compression height (dimension from wrist pin to top of piston), but the M-block wrist pin is slightly larger than the 351C wrist pin.

The 351M piston is unique, with a taller compression height than the 351C and 400 pistons, and it is not interchangeable with any other engine.
distributor 100% interchangeable Distributors for 335 series engines also interchange with the 385 series (429/460).
water pump 100% interchangeable All 335 series engines use the same front cover and water pump attachment.
fuel pump 100% interchangeable Mechanical (cam driven) fuel pumps on all 335 series engines use a unique vertical bolt attachment pattern, and they are not interchangeable with any other Ford engines.
thermostat housing/water outlet 100% interchangeable There were several factory designs used in different applications. The main difference between the various factory designs was the number and location of pipe-threaded bosses for PVSs and other temperature sensors.
oil pan 100% interchangeable Even though the gasket surface and bolt patterns are identical among all 335 series engines, there are different designs (e.g., front sump, rear sump, etc.) used in different applications.
oil pump 100% interchangeable All 335 series engines use the same oil pumps and pickup tube mounting. Pickup tube designs vary by oil pan applications.

 

I just found it.
https://www.ford-trucks.com/articles/mblock.php