Just got our new 310`s back from having them flat-milled .050
Going on our new 496".

Question...What head gasket do/did you use?

I ask because, Canfield is recommending the Fel-Pro 1017-1 which has a gasket bore diameter of 4.540 and a .041 thickness.

I`d prefer the 1027 with a 4.370 dia and .039 thickness
Makes no sense that they are so adament about it too.. something about any other gasket will "pressurize the cooling system"!!??

Am I overlooking something here ??

Just got our new 310`s back from having them flat-milled .050
Going on our new 496".

Question...What head gasket do/did you use?

I ask because, Canfield is recommending the Fel-Pro 1017-1 which has a gasket bore diameter of 4.540 and a .041 thickness.

I`d prefer the 1027 with a 4.370 dia and .039 thickness
Makes no sense that they are so adament about it too.. something about any other gasket will "pressurize the cooling system"!!??

Am I overlooking something here ??

Steve,

When I ran the Canfields on my 468 I used the 1017's just because They said too, I too questioned it, but figured they knew more than me. When they went on my 540 they were the right ones, so I never really pressed the issue.

Do you have both gaskets to compare side to side, I mean it shouldn't be different in the cooling passages :confused:

Steve,
Do you have both gaskets to compare side to side, I mean it shouldn't be different in the cooling passages :confused:

Tom, I don`t have any on hand to compare.
There`s a couple GM gaskets I like too.

Puzzles me too..what could possibly be the difference ?

Maybe Wolfplace or one of the other Pro`s might know

If you have a PAW catalog ,they explain the differences in a chart of all head gaskets!! They talk about cooling and what not..SORRY I AM AT WORK ,DON'T HAVE THE CATALOG WITH ME!!

From my understanding the aftermarket heads (at least AFR's) are all designed around a
4.5" bore. The 4.310 gasket will be smaller than the chamber size of the head.

Red,

The reason they don't want you running the smaller bore gasket is because part of the sealing ring will be protruding into the cylinder bore. I went through this back when I was running those heads ;) If you want/need a smaller compressed height you can get a custom gasket from Cometic or similar.

Red,

The reason they don't want you running the smaller bore gasket is because part of the sealing ring will be protruding into the cylinder bore.

Do you mean to say "head chamber" if the heads are designed around a 4.5 bore?

Red,

The reason they don't want you running the smaller bore gasket is because part of the sealing ring will be protruding into the cylinder bore.

Ken, on a big bore I can see where that could happen, but a 4.310" ?? That`s what trips me up.

Steve

From my understanding the aftermarket heads (at least AFR's) are all designed around a
4.5" bore. The 4.310 gasket will be smaller than the chamber size of the head.


These where the optional 113 cc now trimmed down to..off the top here..maybe 103 cc or so.
Can`t imagine a problem like that happening

These where the optional 113 cc now trimmed down to..off the top here..maybe 103 cc or so.
Can`t imagine a problem like that happening
=
Steve,
If the fire ring does not hang into the chamber of the head you can use the small bore gasket.

Can't speak for the Canfield but with the AFR head you can't use the small bore gasket because of the way the chamber in the head is CNC'd.
Gasket will hang in the chamber ;)
Only way to be sure is to set a small bore gasket on the head & see how it fits.

1017 & 1027 both have the same cooling holes & you cannot use them on GM Gen V & VI blocks.

The 1037 & 47 will also work if the three lower holes between the center two cylinders are present as well as working on the later V & VI blocks

Some earlier blocks need them drilled, use the gasket for a template & you will see where they go.

Reason the 17 & 27 won't work on the V&VI blocks is they are open in the front & will bypass too much coolant.

Can't speak for the Canfield but with the AFR head you can't use the small bore gasket because of the way the chamber in the head is CNC'd.
Gasket will hang in the chamber.



So that puts me out for the AFR's on my 496 as I didn't 0 deck the block, I decked it but only enough for the GM shims and I will end up with not enough quench. Can you use the GM #14015351 shim gaskets with any aluminum heads assuming it doesn't get into the head chambers? This is not looking good for me and aluminum heads. :(
Thanks, Jeff

Do you mean to say "head chamber" if the heads are designed around a 4.5 bore?

Yeah, sorry. I meant chamber. Just got back from taking the kids to see Santa and was still a little goofy. I can't believe I sat on his lap and asked for more car parts :D

I can't believe I sat on his lap and asked for more car parts :D

Hopefully, he was not TOO happy you sat in his lap.....:yes:

Steve, What gasket did you end up using?

Steve, What gasket did you end up using?

Ended up using the recommended 1017 Fel Pro..Ironically we`re in the middle of changing the block out to a MK IV BowTie.

This time I`m going to tighten up the quench. Might even use the GM gasket with .030 compressed thickness and a 0 deck. We`ll see..

yes, it is due to the sealing ring that would pertrude into the champer (had my heads off a few month ago and I can confirm that on the stock 119 chamber, you MUST use the recommended gasket part number).

Ended up using the recommended 1017 Fel Pro..Ironically we`re in the middle of changing the block out to a MK IV BowTie.

This time I`m going to tighten up the quench. Might even use the GM gasket with .030 compressed thickness and a 0 deck. We`ll see..Steve, Thanks! I may be cloning you and your sons 496 if no one snaps up the new 310's I have for sale. :)

P.S. - While I have you. What did you do for pushrods? I know I have to check but just curious what you ended up with.

Steve, Thanks! I may be cloning you and your sons 496 if no one snaps up the new 310's I have for sale. :)

I have the pistons and intake here for you,cheap!:D

Steve, Thanks! I may be cloning you and your sons 496 if no one snaps up the new 310's I have for sale. :)

P.S. - While I have you. What did you do for pushrods? I know I have to check but just curious what you ended up with.

I ordered a set from Trend..Off the top I can`t remember. I know the deck was 0 and the heads milled .050. The motor is coming apart soon, If you`re not in a rush.

Thanks...that`s quit a compliment !

Thanks again. I should have asked you to list the full valvetrain :D but I just sold the heads. (I still may duplicate what you guys have done and I want to do it exactly so as not to miss a beat!) I do have another set to build later, so that's fine, I can wait for the info. I will measure for mine when the time comes and it would be interesting to see how they compare to yours. As a matter of fact, I will try to stay in touch with the forum member who bought them from me to see what he comes up with on lengths, too.