I don't have a mic/caliper at the house so I use a regular ol' measuring tape and here's what I found. Intake measured about 1 7/8" and exhaust measured about 1 5/8". I'm guessing that I have the earlier heads.

Secondly, I'll be running either 10.2:1 or 10.7:1 compression ratio depending on whether I use thick or thin head gaskets. Which gasket should I use if I want to run 97 Octane pump gas and occasionally run something higher?

Last but not least, if I have these heads rebuilt, should I have hard valve seats put in them and would you recommend a 3 angle valve job?

As I understand it, 69-74 351W heads have larger intake and exhaust valves than 75-77 heads. On the bottom of the heads I have is a p/n DOOE......does this mean 1970?

(YES IT DOES)

I don't have a mic/caliper at the house so I use a regular ol' measuring tape and here's what I found. Intake measured about 1 7/8" and exhaust measured about 1 5/8". I'm guessing that I have the earlier heads.

(YES AGAIN)

Secondly, I'll be running either 10.2:1 or 10.7:1 compression ratio depending on whether I use thick or thin head gaskets. Which gasket should I use if I want to run 97 Octane pump gas and occasionally run something higher?

(10.7-1 is fine if you can get 97+ octane fuel)

Last but not least, if I have these heads rebuilt, should I have hard valve seats put in them and would you recommend a 3 angle valve job?

(A 3 angle valve job is standard now a days, and hardened seats are the way to go)

Thanks for all the suggestions and expert advice. I love this site and have told several friends who also own Mustangs about it.

You're welcome, sorry about the impersonal way I replied to your questions, but it seems to work out better for me. Welcome to M&M, the best Ford site on the net! Post often and you won't be disappointed.

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SteveW

I like asking bunches of questions all at the same time, so it's much easier for me.