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My book says used on 352,390,410 and 428 w/o air, 71.2 to 74.2 cc chamber volume.I have personally seen them on a couple of 67 T bird 390 motors.I have heard some say they were used on Mustang 390's etc, but I think they may have been drilled with the extra holes.

1967 S code GT Deluxe Coupe 65B
1966 Convertible 76B 289 4 speed

Descendent of Francois Seguin dit Laderoute,
Soldier Regiment d' Carignan, New France 1665-1668
 

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I guess it could be correct for my 390GT motor then. I asked John who is working on my car how many bolt holes there were on each port and he said 2 but maybe he was speaking of the manifolds.

Mike
Cortlandt Manor, NY
'68 GT390 FB, 4spd bench seat
http://www.geocities.com/stangman39/stangsho.html
 

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How about 67 GT500 428 Heads!! According to the Ford Parts Identifier for 65/68 Mustang.(These have been used on other motors). Could be a PI motor I would think at least!! Ck that Crank. IU??
 

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If there are only two holes in the head for each port, you can drill and tap the other two. The head castings should have the bosses cast into them for the other holes.

68 GT500
68 1/2 CJ Coupe

MCA# 18519
 
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Let me know what you find out because I have been told that the reason I have 428 heads on my 390 is because Ford decided the earlier 390 heads didn't breathe well enough and installed the 428's on late production '68s. I have an April , San Jose car.
I've never seen any documantation to the fact.
Thanks

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"Sometimes a man's life can depend on a mere scrap of information."-The man with no name
 

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That's a nice Stang you got there :)
Funny you mention that about your car - I had a '68GT390 coupe that had CJ heads on it. It was also a SanJose built car. However, I think someone added them at one time. Who knows tho, anything was possible at the factory.


Mike
Cortlandt Manor, NY
'68 GT390 FB, 4spd bench seat
http://www.geocities.com/stangman39/stangsho.html
 

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One application was 67-68 390 4V installed in Mustangs. Got a NOS one out on the shelf. And the number matches the casting number on heads of each 67 390 Mustang I've owned

Jeff Speegle
MCA Shelby Gold Card

http://www.geocities.com/MotorCity/6473
Mustang & Shelby research, documentation

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Seeing your post I had a quesstion and thought

1. Never hear that story and really don't understand the logic but dod the casting dates on your heads "go" ith the rest of the engine

2. Ford's documents of the time don't mention such a change. The Technical Service Bullitens of the time would be the place things like this would have been share with the service department. Such a change would be a major item to mention considering that they even included very little detail changes in production. Examples in 68 included change in spark plug heat range, crank shaft pulley bolt change and so on

3.Another thought would be why would care if late 390;s didn't breath well? In fact this would be a great way to sel the CJ's in place of the 390's

Sorry but we hear tons of stories and few if ever pan out. ;)

Do always love hearing these though. Best one so far IMHO was the one where the 65 Shelbys were built with 6 cylinders (guy even claimed he had one of these rare engines ;) And Shelby swapped the K engines into the car while at his factory

Car looks great... always loved the 68 fastback GT's

Jeff Speegle
MCA Shelby Gold Card

http://www.geocities.com/MotorCity/6473
Mustang & Shelby research, documentation

http://albums.photopoint.com/j/View?u=1609818&a=12284202&p=44925357&Sequence=7&res=high.jpg
 
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