[Elarson]

Originally Posted by 60man

OK..Speaking of dissimilar metals....which combo would tend to seal better....a aluminum block & heads ....or a iron block & aluminum heads ??? Always wondered if there was advantage (not including less weight) to going with aluminum block ??

I would expect the iron head/alum block to work better, (theoretically) for a couple of reasons:

1) iron head is stiffer and would bridge across the head bolts better.

2) the head runs hotter than the block. Iron has a lower coefficient of thermal expansion. So....that mix would tend to equalize the thermal expansion of the two and minimize the movement along the deck surface.

But if someone has actually tried it and it didn't work well, that would override theroy.

FWIW,
Eric

[Elarson]

"One test is worth a thousand expert opinions"

author unknown but that's been a favorite of mine for years.

Eric

[GTO Dan]

Originally Posted by Elarson

"One test is worth a thousand expert opinions"

author unknown but that's been a favorite of mine for years.

Eric

Dude, keep that quote to yourself, if that gets around the only postings left on the internet will be porn.

[twooldgoats]

Originally Posted by GTO Dan

Dude, keep that quote to yourself, if that gets around the only postings left on the internet will be porn.

Even then..........

[Mike Kasparian,Sr.]

Has the cometic been surviving with this mod? Seems like the raised sealing embossment in that area flattens out with the heat then you just end up with 3 flat layers in that area. Good idea, hope it works out. MK

[65nss4spdGTO]

Originally Posted by Mike Kasparian,Sr.

Has the cometic been surviving with this mod? Seems like the raised sealing embossment in that area flattens out with the heat then you just end up with 3 flat layers in that area. Good idea, hope it works out. MK

This is just going into testing with the Tiger head. The process has been used in other applications with good results.

Calvin Hill
Hill Performance
708-250-7420