S54 Stock Headers on M20?

[AWDBOB]

I've always wondered if these could be welded to an m20 exhaust flange. 1.5" primaries, cylinder distance is the same. Would be a great header option if they could be made to fit easily/done in a batch.

M20 exhaust port ramp is more upward facing, s54 has a flatter exit.

Won't fit at all with b25 oil cooler setup. Would require a short filter b27 mount style or oil filter relocation.

Couldn't find any info on it so I wanted to take a few photos while I had a set on hand.

Engine block tab hit the front most head flange so I couldn't get the front flat. This orientation was the closest fit.

Untitled by bimmertown, on Flickr

Untitled by bimmertown, on Flickr
Untitled by bimmertown, on Flickr

[AWDBOB]

Flipped the oil filter housing, cut the flanges off that were hitting the block, and this is looking quite feasible. Flipped oil filter likely isn't serviceable in the current position but retains A/C. With it flipped down and forward it would take the place of the a/c bracket but become serviceable.

Front header hits the engine mount arm but would clear if it was cut back before the pipe expands for the cat. I know some efficiency is lost this way but not make or break.

#5 runner hits the block coolant drain, but making 3d printed stainless adapters like hoveringuy did with the s54 to n52 headers would allow me to design them so they clear everything.

Untitled by bimmertown, on Flickr
Untitled by bimmertown, on Flickr
Untitled by bimmertown, on Flickr

[2mAn]

Amazing & Interesting!

I love that ~40 years later there are still innovations being made on the M20.