Posted By: GTSDart340
72 360 head ID - 01/17/15 08:18 PM
I have a 72 motorhome 360, 2 barrel. The casting number on the heads is 34189156. I found the number 3418915, which says it's a 71-2 360 head, but I can't find any with the extra 6 on the end. Would these be "j" heads? Thanks.
Posted By: RapidRobert
Re: 72 360 head ID - 01/17/15 08:21 PM
is that number a 3418915-6.
Posted By: GTSDart340
Re: 72 360 head ID - 01/17/15 08:22 PM
Its hard to tell, as the engine is still together. It probably is. It's in a shed, so it's kinda difficult to get to.
Posted By: ademon
Re: 72 360 head ID - 01/17/15 09:54 PM
Probably just a J head with 1.88 intake valves
Posted By: vdriver
Re: 72 360 head ID - 01/18/15 03:41 AM
Yep, 915 J heads. Note the big "J" in the casting below; there should also be one on the outside between the spark plug holes. Don't be surprised if they're cracked.
Posted By: dogdays
Re: 72 360 head ID - 01/20/15 08:06 PM
Yeah, it's a "magical" J head, pull'em and sell to some fool who thinks they are trick. They were used on 340s back in the day, so they have street cred. The fact that Mopar engines many times used exact same components across the performance range seems to have escaped the hoi polloi.
R.
Posted By: Alaskan_TA
Re: 72 360 head ID - 01/20/15 08:31 PM
The 915 castings can be J, O, U or Z heads, the letter itself means nothing.
Posted By: Alaskan_TA
Re: 72 360 head ID - 01/20/15 09:33 PM
They can also be T/A heads.
The 915s were pretty popular.
Posted By: GTSDart340
Re: 72 360 head ID - 01/21/15 01:38 AM
They are going to be used on my 408 project, at least until I can afford some aluminum heads. I will put the 2.02 valves in them.
Posted By: dogdays
Re: 72 360 head ID - 01/21/15 06:51 PM
I believe there are several articles floating around on productive modifications to the intake ports and it is possible to get 250cfm from them with basic porting.
I'd more suggest you use the $ you would have spent on the larger valves and put it towards porting and a competition valve job. There's more hp in that.
R.
Posted By: MoparforLife
Re: 72 360 head ID - 01/21/15 11:34 PM
What do you want more low end torque or top end. If you want more low end I know some circle track guys that have gone back to the 1.88 valve over the 2.02 and have gained a lot of low end coming out of the turns. Personally I switched from 1.88 to 2.02 and gained absolutely nothing when I had my duster. Both set had the same cut to the same CC other than that were in stock form.
Posted By: GTSDart340
Re: 72 360 head ID - 01/22/15 12:12 AM
It's going to be a mostly street but occasionally strip car. I want it (68 Dart) to be able to take down a 69 Skylark with a 455... So I'm looking at low 12s high 11s. I want it on the edge of being legal without a cage. At this point, it's all in the planning stage. Thanks guys!
