It's been a while since I have done anything with my project other than packing it up and putting it in storage since we are moving but I'm doing some armchair engineering. I'm trying to keep my project as straightforward as possible and I started thinking about my cylinder head choice(again). I had previously decided to use the 5.6 heads with their larger valves/ports and they will fit with some machine work but the downside is the large combustion chambers, the cooling/oil passages need to be matched, the long cam bolts don't line up and the accessories don't fit like the 4.5. I have some K-jet 4.5 heads and took a fresh look at what it would take to turn them into 5.6 heads. The valve guide basic bores are the same so no problem there. New valve seats are no problem and I have 5.6 heads to copy the port design. My concern is breaking through during porting. I'm thinking about experimenting with some junk heads before I go to the expense of new valves.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT