Edelbrock head steam holes

[65fastbackresto]

Says on the info I got with the heads, on older style blocks you need to drill out an extra steam hole into the block and the heads. My engine guy is wondering about this, we even looked at some old style heads and they didnt have the extra steam hole either. Anybody know about this stuff?

The instructions aren`t real clear on this one actually, I`m kinda lost, calling Edelbrock tech, I`ll let ya know.

 

[coolblue65]

Yeah you are supposed to drill it.

If you do a search there was some discussion about this not to long ago.

 

[65fastbackresto]

Wow, Edelbrock thinks

They may have missed a step in the machining process, he said the heads should have the steam holes in them already, and they dont appear to have them. Got to email them pics so they can check it out. I`ll update yall later.

So if I understand this correctly, I have to drill only the block to get these holes to line up, right?

 

[Max Power]

Have you tried Edelbrock's tech line?

 

[65fastbackresto]

Yea Edelbrock is investigating the issue

They gonna call me back today.

 

[68keyblr]

They gonna call me back today.

How did this turn out?

 

[65fastbackresto]

It turned out

that only the 289 motors needed drilled to match. Apparently 289 blocks have some steam holes that you have to drill the head to match them. The lack of the steam hole in the head will cause a hot spot in that area from poor water circulation and possibly damage it over time.

This issue even stumped the tech line at edelbrock for about a week. I think they had to find some of the old school tech guys to find out.

I will add that if you happen to have a 302 manufactured before 1973, you better look real close at the block for the steam holes, because their was some debate on this subject, and it never really got cleared up. Mine was a 78 block, so once I knew what to look for, it was a non issue for me.