M30b35 question

[Bavman]

Hello I searched a bit, now asking here….This is in regard to US m30b35 engines. A couple of things I know, the earlier b35 engines like the ones used in the 635 have the engine boss holes in the same place as all the earlier m30 blocks. These blocks are regarded to be more durable as far as cracking from the rear head bolt holes. I “think” these engines ran a 150 yellow label ECU. I am looking at one of these motors now and it appears the intake ports are the same as the b34….is this true of the engines with the early bosses? My understanding is that all b35’s had 1mm larger intake valves….will have to check date on this head. Wondering about this because of port matching triple Weber manifold…most big valve heads I have looked at have a significantly larger, wider intake port….wondering if there was a transistion, like with the block itself that earlier castings used…This engine does have Motronic 1.3 like all b35’s.

Thanks

Alonzo Taylor

 

[rblongboarder]

M30 head evolution interests me too.. so far, I've compiled some M30 head part numbers and photographs.. this is not a comprehensive list.

R

Post in thread 'Karzundpartz manifolds for B34'

Oct 8, 2026

I wanted to say thank you to everyone who jumped into this conversation; I learned a lot. After @Bavman posted, I started looking at various heads and intake manifolds.

Here's a collection of images I found...

• 1984 M90 head 1304473
• 1984 M30 head 1277358
• M30B34 Intake Manifold 1270676 (1)
• M30B34 Intake Manifold 1270676 (2)
• 1984 M30B34 Engine 1304473
• 1987 M30B34 Engine 1288086
• 1984 M106 Turbo Head 1288086
• M30B35 Intake Manifold 1707617 (modified intake port shape)
• 1987 M30B35 Head 1708843 (modified intake port shape)

It seems to me the...

• rblongboarder