Aircooled VW South Africa

My old 1963 type 1 is spluttering along on 3 cylinders!

Replaced all usual suspects. A new spark plug will fix it for a short while thereafter it goes dead again. I think its number 3 and 4 cylinders that go dead.

There is also a loud clapping sound when the engine is revved up high without load.

I have been advised that it can be a crack in that cylinder head?

Now.....what is the road forward. I need some advice on a reliable rebuilder in Johannesburg, or maybe a rebuilt swop out? It seems these guys are hard to get hold of on the www?!

Any questions or advice will be appreciated! I just want a reliable everyday car I can drive. It has given good service to me for more than 30 years!

It could be a burnt valve or even a loose cylinder head.

If the engine is not burning excessive oil and doesn't have excessive end float on the crank, then a rebuild is probably not indicated. Sounds like you could make do with rebuilding both the heads, unless the bottom end of the engine shows excessive wear.

I am hoping I can get away with only the heads, but will measure that endplay.It uses no oil and not smoking. Any recommendations on head rebuilders?