I have to pull my heads this winter. When I rebuilt it last time I had the GMPP heads milled .010 just to make sure they were flat. I used a Fel Pro gasket with a .039 height. Since the heads and block are both milled I have had a hard time making my intake fit right. It bolts down but you guys know the story. I used the thinest intake gaskets I could find.

I see fel pro has a real thick gasket out a .051 height

( see link)


http://store.summitracing.com/partdetail.asp?part=FPP%2D1017%2D2

I dont mind losing a little CR , Im at 10.8 now but will these large bore gaskets work on my small bore 4.25 block ? I realy dont want to mill the intake. I may have use for it on another project.

Roger,
I dont know that the extra .012" thickness is going to make much difference. I almost sounds like the heads have been milled a bunch in the past, or the block decked down to "0" deck. If you dont want to mill the intake, and you are pretty sure that the heads are going to stay with that engine...have your machine shop take a cut off the intake surface of the heads instead. Its not that hard to do if they have any type of modern milling machine. Before you pull the heads, try the intake on the engine without the intake gaskets. If the bolt holes line up ok, then just mill the heads (intake surface) the thickness of the gaskets. By the way, I know a shop in Southern Maryland that can take care of it for you smile.gif

Im not sure how much has been been removed off the decks of the block. I got this block from Coleman Brothers machine shop back in 1980, It was dropped off for machine work but never picked up so I paid the bill and took it home. When I built it up I had the pistons about .005 down in the hole, with the .031 gasket I had my quench at .036. Maybe thats why it ran great on pump gas(?)

If I go to the thicker gaskets I think I would end up screwing things up. Im going to pull the heads and go from there. I dont have a decent machine shop around here so I looks like you have a new customer.

Bill,

Stock in the hole is .025" isn't it??? pdq67