Valve cover half moon rubber plugs, why needed?

[chuckycheese]

I'll give 'em a review when I get them. I like that they have a lip on both sides.

Yeah...I noticed that!! It looks like they "lock" in.

[Jaguarjoe]

I just bought a set too. They should just lay in the head with just enough clearance for a little bit of sealant around them.

[SqDancerLynn1]

I bought a set from him too, very well made. Have not used them yet,but they fit nice & tight into the head.

[smagnusen]

Anyone have a reason why I might not use yamabond to fix a leaking half moon?

[first timer]

i just bought some as well, lets hope they are good!

[renobruce]

Anyone have a reason why I might not use yamabond to fix a leaking half moon?

I don't see why you couldn't. Yamabond is supposed to stay flexible.

I just received mine today. They look great. Nice, tight fit as Lynn said.

[Jaguarjoe]

My aluminum half moons came in today. They don't fit. The gap between the the two flanges is a tad too small so they won't slide all the way in. The diameter looks OK, they're just too narrow by a hair.

If I can't get a refund I'll donate them to someone here who may have better luck with them. Meanwhile it's back to the rubber ones with a coating of 518 to seal them up again.

[renobruce]

My aluminum half moons came in today. They don't fit. The gap between the the two flanges is a tad too small so they won't slide all the way in. The diameter looks OK, they're just too narrow by a hair.

If I can't get a refund I'll donate them to someone here who may have better luck with them. Meanwhile it's back to the rubber ones with a coating of 518 to seal them up again.

Well that's weird! I'll buy them from you if you get stuck with them.

[Jaguarjoe]

Yeah, I was majorly bummed about this. The cylinder head 'wall' measures 6.0 mm thick. The half moons measure 5.6 mm. Too tight to fit.