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Author Topic:   351W Heads
Lennie_21
Journeyman

Posts: 92
From: Denton, TX
Registered: Mar 2001

posted 03-28-2001 09:10 PM     Click Here to See the Profile for Lennie_21   Click Here to Email Lennie_21     Edit/Delete Message   Reply w/Quote
Ok, couple of questions about 351W cylinder heads.

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?

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?

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

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steve'66
Gearhead

Posts: 6602
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-29-2001 12:37 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Ok, couple of questions about 351W cylinder heads.

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.


------------------
SteveW

Melissa's '66 http://content.communities.msn.ca/isapi/fetch.dll?action=show_photo_index&ID_Community=Tomsdragpix&ID_Topic=1&ID_Message=27
M&M
member #427

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Clark
Gearhead

Posts: 592
From: Rowlett,Texas
Registered: Aug 99

posted 03-29-2001 10:07 AM     Click Here to See the Profile for Clark   Click Here to Email Clark     Edit/Delete Message   Reply w/Quote
I like the way you answered Steve and I second the advice.
Also, make sure that you get these ported and polished, it's incredible how much improvement this will make.

------------------
69 351W Sportsroof Deluxe

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Lennie_21
Journeyman

Posts: 92
From: Denton, TX
Registered: Mar 2001

posted 03-30-2001 05:41 PM     Click Here to See the Profile for Lennie_21   Click Here to Email Lennie_21     Edit/Delete Message   Reply w/Quote
Excellent.......Thanks Steve and Clark. I was hoping I get a bunch of yes answers!!!
And you don't need to apologize for the way that you answered the questions. As a matter of fact it's easier to read the answers that way than to get a list of Yes, No, No, No, Yes, Yes.....

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

Thanks again guys.
Lennie

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steve'66
Gearhead

Posts: 6602
From: Sonoma,CA,USA
Registered: Mar 2000

posted 03-30-2001 06:32 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote

SteveW

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