Cracked m20b27 cylinder head

[Foo Hefner]

I was disassembling my m20’s cylinder head and I realized I cracked it where the rocker arm goes through. I was wondering if it’s fixable or should I just buy another head?

[digger]

defintitely fixable, but being an eta head a replacement head is the best option IMO

[TobyB]

I've had one much worse than that
(timing belt special)
repaired, and it held up fine in a street car.

If you can find a competent welder who is comfortable
with aluminum castings, my friend Jon said it was very
straightforward to grind away and reweld.

t

[zaq123]

I wonder how did it crack? Did you beat on it to get it out? I noticed one thing on those shafts during the disassembly which when addressed, allows you to just slide it out with your hand. Rocker retaining clips over time create little raised bur on those retaining slots in the shaft. Rockers are very snug on the shaft and that bur will keep them from sliding off. Just run a little high grit sand paper on the shaft till you can feel to burr with your nail near the slot and it will come apart without any hammers
post #12 https://www.r3vlimited.com/board/for...ft#post6775936

[TobyB]

it will come apart without any hammers

if it's not warped at all, or never been overtorqued, yeah...

t

[digger]

Or tonnes of varnish buildup not everyone has professional cleaners