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Small block head #2706442
10/13/19 03:33 PM
10/13/19 03:33 PM
Joined: Mar 2008
Posts: 47
TX
RiskyRickey Offline OP
member
RiskyRickey  Offline OP
member

Joined: Mar 2008
Posts: 47
TX
Where do you find the markings to find out if they are j /x heads ? pic would be helpful . Thanks in advance

Re: Small block head [Re: RiskyRickey] #2706966
10/15/19 10:57 AM
10/15/19 10:57 AM
Joined: Sep 2003
Posts: 11,891
north of coder
moparx Offline
Dreaming of implants
moparx  Offline
Dreaming of implants

Joined: Sep 2003
Posts: 11,891
north of coder
i think there is a cast X or J under the valve cover, somewhere close to the head casting number.
beer

Re: Small block head [Re: moparx] #2706980
10/15/19 11:30 AM
10/15/19 11:30 AM
Joined: Aug 2003
Posts: 33,630
Bend,OR USA
C
Cab_Burge Offline
I Win
Cab_Burge  Offline
I Win
C

Joined: Aug 2003
Posts: 33,630
Bend,OR USA
Originally Posted by moparx
i think there is a cast X or J under the valve cover, somewhere close to the head casting number.
beer

Those letters are cast into the head by the spark plugs, #7 on the drivers side and #2 on the other side, the head casting number is cast on them near the 2nd rocker arm stands scope
BTW the 1970 to 1973 340/360 915 heads came in two different valve sizes as well as several different letters cast on them not just the J shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Small block head [Re: Cab_Burge] #2706996
10/15/19 11:53 AM
10/15/19 11:53 AM
Joined: Sep 2003
Posts: 11,891
north of coder
moparx Offline
Dreaming of implants
moparx  Offline
Dreaming of implants

Joined: Sep 2003
Posts: 11,891
north of coder
thanks for correcting me cab ! up
it's been a LONG time since i played with a small block. if i remember correctly, it was around 1983 or so.
beer

Re: Small block head [Re: Cab_Burge] #2707000
10/15/19 12:06 PM
10/15/19 12:06 PM
Joined: Aug 2005
Posts: 234
Hinckley, Ohio
KWF340 Online content
enthusiast
KWF340  Online Content
enthusiast

Joined: Aug 2005
Posts: 234
Hinckley, Ohio
The photobucket watermark is exactly where I don't want it for the J head, but there's enough there to see where they are..

[Linked Image]

[Linked Image]


1969 Super Bee, 383, 4-speed, T5;
1969.5 Road Runner, 440-6, 4-speed, 96;
1970 Duster 340, 4-speed, EV2;
1970 Charger R/T SE, 440 (496), Auto, EB3;
1970 Dart Swinger 340 (416), 4-speed, EV2;
1970 Corvette coupe, LS5, 4-speed, Daytona yellow;
2000 Corvette coupe, LS1, 6-speed, TT, Torch red.
Re: Small block head [Re: KWF340] #2707259
10/16/19 11:19 AM
10/16/19 11:19 AM
Joined: Sep 2003
Posts: 11,891
north of coder
moparx Offline
Dreaming of implants
moparx  Offline
Dreaming of implants

Joined: Sep 2003
Posts: 11,891
north of coder
i uncovered the only small block i have just to see, and yep, a big fat J was where it was shown in the pics.
now if i can just remember ! spank
1983 till now. 26 years. wow.
beer

Re: Small block head [Re: moparx] #2707429
10/16/19 09:38 PM
10/16/19 09:38 PM
Joined: Dec 2007
Posts: 54
Long Island, New York
57Fury440 Offline
member
57Fury440  Offline
member

Joined: Dec 2007
Posts: 54
Long Island, New York
1983 is 36 years ago.

Re: Small block head [Re: 57Fury440] #2707581
10/17/19 09:54 AM
10/17/19 09:54 AM
Joined: Sep 2003
Posts: 11,891
north of coder
moparx Offline
Dreaming of implants
moparx  Offline
Dreaming of implants

Joined: Sep 2003
Posts: 11,891
north of coder
Originally Posted by 57Fury440
1983 is 36 years ago.


see, i can't count either ! laugh2
CRS and "oldtimers" disease are serious medical conditions !
beer

Re: Small block head [Re: moparx] #2707587
10/17/19 10:09 AM
10/17/19 10:09 AM
Joined: Jan 2003
Posts: 28,374
Hamtramck, PA
Alaskan_TA Offline
Fluffy Balladeer
Alaskan_TA  Offline
Fluffy Balladeer

Joined: Jan 2003
Posts: 28,374
Hamtramck, PA
You are better off looking for the casting numbers for J heads.

The 1970 up 915 heads can be J, O, U or Z.

Around 1974 or so, another J head came on the scene, it is a 974 casting.


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