Holes in the intake ports that run into the rocker stud bosses?

tfs a460 heads.... what are these for?... just curious... and if the intake ports are that thin how can they be safely ported or cnc'd?

my A460's are the same way.you wont have any problems with them.very little cutting in that part of the head for cnc anyway.

cool thanks...I figured they were "supposed" to be there...they are in every intake port, on both heads, and have been hit with some kind of grinder...

Most heads i've seen are like that my scj's my world iron windsors and my kaase small block heads.

Those holes are on 90% of the BB Ford and BB Chevy aftermarket heads that are out there. The manufacturers have to tap the hole deep enough and it breaks through the roof of the intake port. Just make sure you use some kind of sealer, such as pipe dope or RTV on the intake rocker studs, or the engine will suck oil through those holes and put out blue smoke.

Hope this helps,

Charlie Evans

Good question, and thanks for the tip Charlie. A friend of mine (chevy guy) was fingering my A heads and told me they were F'ed up because of those holes. I told him i'm sure theres a reason for them. He then proceeded to assure me his Pro Comps didn't have them . Needless to say I was no longer worried.


Dave S.

c.evans wrote:Those holes are on 90% of the BB Ford and BB Chevy aftermarket heads that are out there. The manufacturers have to tap the hole deep enough and it breaks through the roof of the intake port. Just make sure you use some kind of sealer, such as pipe dope or RTV on the intake rocker studs, or the engine will suck oil through those holes and put out blue smoke.

Hope this helps,

Charlie Evans

will do... thanks charlie...

Loctite is the best sealer...i.m.o.

Lem Evans wrote:Loctite is the best sealer...i.m.o.

use the red..........