[john marcella]

I hope it works for you. But boy i dont know, 2 dissimilar metals on the deck at the highest temp spot????
Why not just machine a pocket out of the deck , like you did, and fill it up with a hard welding rod and peen the hell out of it?

Have you done this before? If not Good luck!

[60man]

Originally Posted by john marcella

I hope it works for you. But boy i dont know, 2 dissimilar metals on the deck at the highest temp spot????
Why not just machine a pocket out of the deck , like you did, and fill it up with a hard welding rod and peen the hell out of it?

Have you done this before? If not Good luck!

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 ??

[john marcella]

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 dont think that would mater that much.But i dont know. I would have to say iron block.
My concern is the 2 metals on the same surface, same plane. I think that piece is coming out, but i have been wrong before. If it works that would be pretty cool.

[65nss4spdGTO]

Originally Posted by john marcella

I dont think that would mater that much.But i dont know. I would have to say iron block.
My concern is the 2 metals on the same surface, same plane. I think that piece is coming out, but i have been wrong before. If it works that would be pretty cool.

The insert has been machined in a key type fashion, the alloy material will not burn up and fall out. The rest of the head with have to collapse or completely burn away for that to happen.

Calvin Hill
Hill Performance
708-250-7420

[john marcella]

Originally Posted by 65nss4spdGTO

The insert has been machined in a key type fashion, the alloy material will not burn up and fall out. The rest of the head with have to collapse or completely burn away for that to happen.

Calvin Hill
Hill Performance
708-250-7420

I didnt think it would burn up or fall out. I think you are going to take it out.
How deep does the key go? how much press? It definitely has the potential to work.
Its not a dumb idea.
Have you checked the Rockwell of the head in that spot? Have you tried a different heat treat?

[twinturrbo406]

Originally Posted by john marcella

I didnt think it would burn up or fall out. I think you are going to take it out.
How deep does the key go? how much press? It definitely has the potential to work.
Its not a dumb idea.
Have you checked the Rockwell of the head in that spot? Have you tried a different heat treat?

... we did have a set of ProStock Ford heads in the shop a little while ago, and they had many runs on them, and i myself was surprised to see that piece in there, but it has held up very well ...

[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 john marcella

I hope it works for you. But boy i dont know, 2 dissimilar metals on the deck at the highest temp spot????
Why not just machine a pocket out of the deck , like you did, and fill it up with a hard welding rod and peen the hell out of it?

Have you done this before? If not Good luck!

This has been done before, just our first attempt with the Tiger head. The thermal properties of the materials have been taken into consideration in the machining process.

This alloy will resist heat much greater than the aluminum.

Calvin Hill
Hill Performance
708-250-7420

[John Langer]

Originally Posted by john marcella

Why not just machine a pocket out of the deck , like you did, and fill it up with a hard welding rod and peen the hell out of it?

That wont work. Want to know how I know... Knowing what I know from first hand experiences with n/a Pontiac engines, I wouldnt be brave enough to try that. Just sayin'. I fixed the problem but I guess there is more than 1 way to skin a cat. I didn't really have problems until I started making over 1025-1050 hp.

[john marcella]

Originally Posted by John Langer

That wont work. Want to know how I know... Knowing what I know from first hand experiences with n/a Pontiac engines, I wouldnt be brave enough to try that. Just sayin'. I fixed the problem but I guess there is more than 1 way to skin a cat. I didn't really have problems until I started making over 1025-1050 hp.

What rod did they use? And did they use a air hammer? Air hammer is the key to making the material really dense. Did it at least help for you?

[65nss4spdGTO]

Originally Posted by john marcella

What rod did they use? And did they use a air hammer? Air hammer is the key to making the material really dense. Did it at least help for you?

John,

I really believe it you don't get rid of the heat or use material that can handle high heat, the problem will continue.

Calvin Hill
Hill Performance
708-250-7420

[John Langer]

Originally Posted by john marcella

What rod did they use? And did they use a air hammer? Air hammer is the key to making the material really dense. Did it at least help for you?

Not exactly sure what rod was used but it didnt help at all.

[Robert C.]

Yes this has been proven to work on the Dirty Bird Engine. It helps when the Melting temp. of the material is over 3000 Deg. and aluminum is 1125 Deg.

It is places deep in the head well below the valve seats. He did this 2 years ago. It als pull heat away for the valves too.

[Bill Bolin]

Originally Posted by Robert C.

Yes this has been proven to work on the Dirty Bird Engine. It helps when the Melting temp. of the material is over 3000 Deg. and aluminum is 1125 Deg.

It is places deep in the head well below the valve seats. He did this 2 years ago. It als pull heat away for the valves too.

OK.....I say we just make the WHOLE head out of this material!!!!!!

[john marcella]

Originally Posted by Bill Bolin

OK.....I say we just make the WHOLE head out of this material!!!!!!

Get your wallet out for that one.