I’m trying to confirm which is which.

The 1st head is 1 I pulled myself 10+ years ago off a 1g n/t, but can’t remember if it was 6 or 7 bolt. Was on car till I found some bad damage recently.

2nd is 1 I had got shipped to me for a spare bout 6 years ago. Planed on having work done to it for a rebuild. But had been packed badly and was badly damaged during shipping.

3rd is 1 I got shipped a few days ago.

So I’m seeing different markings on the 3 and other differences inside each. Looks like all 3 have the same size head stud holes. But what has me really asking is that I just pulled all the valves from 1 & 3 and I see as pictured. I see the runners at the cam caps go deeper on 1 but not on the other 2. Also 2 of them have an extra bolt hole net to the oil feed line

Anything big port intake is 1g both 6bolt and 7bolt. Head bolt holes are larger on 6 bolt. All 2g heads have smaller intake ports.

pauleyman said:

Anything big port intake is 1g both 6bolt and 7bolt. Head bolt holes are larger on 6 bolt. All 2g heads have smaller intake ports.

Click to expand...

Would like to say thank you. Made me go back out and do another look over. Intake is the same size so I figured I would go ahead and try drop the head on to my arp’s. Was told it was a 6 bolt head but do to it not going on the studs. More machine shop work

Take a half inch drill bit and open all ten of the holes. Done easily enough in less than two minutes. And. Ow your seven bolt head will slide right on.