[cam1968ss]

Hello, have question someone hopefully can answer. Have one good 291 (2.02/1.6) head 1967 casting. Also have a 461 (2.02/1.6) head 1966 casting. Would there be any problems using these two different castings on my 327 engine? My engine has 30 over dish top pistons, I am using a comp cams extreme energy cam. about 448 lift. Also, on these heads can the presses in rocker studs be replaced, as I have a couple with some bad threads, or is it terribly pricey to have screw in rocker studs put in?

Thanks

[JohnZ]

The 461 and 291 heads are pretty much identical except for the boss for the temp sender. The press-in studs can be replaced, but you'll need .003" oversize studs and the holes need to be reamed to accept them. Screw-in studs without the hex (no machining required other than tapping the holes) are available and inexpensive, or you can have the bosses machined to accept the conventional hex screw-in studs.

[elcamino72]

My father has one "461" and one "462" head on his 1968 327cu Camaro. The engine builder flowed them they came out very similiar so we decided to run them as a pair. The car runs great with absolutely no problems. Pulls well past 4000rpm too.

[oger]

John, you sure about the heads being the same? The 461 is the early shallow chamber and the 291 is changed design that have a much better combustion chamber. It will run fine you really won't notice anything wrong.

[JohnZ]

Originally Posted by oger

John, you sure about the heads being the same? The 461 is the early shallow chamber and the 291 is changed design that have a much better combustion chamber. It will run fine you really won't notice anything wrong.

Chamber shape is slightly different, but there's only about one cc difference in size.

[cam1968ss]

Thanks, will run the heads and let you know how everything works out.

[bilodeaulynn]

Should be fine. I know of a factory 295/350 engine built with one 186 head and one 041 head, assembled Jan of 69. I also have some of each and never can tell a difference in the casting.