Re: on the block filter
Why am I confused at why you have an ON THE BLOCK filter?
Mine is up front next to the fender cover under the hood ---
In some applications (mainly vans and f/s trucks) with the 4.3, the filter attaches to an adapter on the block like other smallblocks. 4wd S-series trucks have it mounted in the fender for clearance and as a convenient hookup point for an oil cooler if so equipped. 90's F/S 4x4 GM trucks with the 5.0 & 5.7 also have an adapter which moves the filter to above the front differential for clearance.
off the top of my head:
Mobil 4011 (long) and 111(short)
Mighty 3980(long) and 3387(short)
Other conversions:
Mobil:
for LS series engines & 4.6 Northstar
5288 (long) 4006(short)
Mighty
159(long) 4006(short)
From memory, the 3100, 3400, 3800, 2.2, 4.3, 5.0* & 5.7* all use the same filter family
*in 2wd trucks & vans there is a larger filter than the 3980 & 4011 (Mighty # M40A)
the 2.4**, 3.5, 3.7, 4.0*, 4.2, 4.5***, 4.6*, 4.8, 4.9***, 5.3, 6.0, & 6.2 (LS family basically) all use the same filter family
*Northstar & Aurora
** Quad-4
***Cadillac
Big-blocks are a completely different game, I haven't been under one in a long time.
The Ecotec is the odd man out, it uses an element/cartridge style filter