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312 and 902 heads...what's the difference??? #1415063 04/06/13 01:56 AM 04/06/13 01:56 AM
Joined: Dec 2011 Posts: 120 Vancouver,Canada 7 70 Roadrunner* OP member
70 Roadrunner* OP member 7 Joined: Dec 2011 Posts: 120 Vancouver,Canada	Guys I'm wondering how similar 312 heads are compared to 902 heads and can they be run on the same engine? The 312 on one side and the 902 on the other?Identically prepped springs/valves...etc. Maybe someone can help me out...thanks Dave

Re: 312 and 902 heads...what's the difference??? [Re: 70 Roadrunner*] #1415064 04/06/13 09:47 AM 04/06/13 09:47 AM
Joined: Jan 2003 Posts: 75,008 U.S.S.A. JohnRR I Win
JohnRR I Win Joined: Jan 2003 Posts: 75,008 U.S.S.A.	What is a 312 head ???

Re: 312 and 902 heads...what's the difference??? [Re: 70 Roadrunner*] #1415065 04/06/13 09:52 AM 04/06/13 09:52 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	312?? http://www.mymopar.com/headcastnumb.htm numbers http://www.moparmusclemagazine.com/techarticles/5115_cylinder_heads/viewall.html

Re: 312 and 902 heads...what's the difference??? [Re: Dodgem] #1415066 04/06/13 10:57 AM 04/06/13 10:57 AM
Joined: Dec 2011 Posts: 120 Vancouver,Canada 7 70 Roadrunner* OP member
70 Roadrunner* OP member 7 Joined: Dec 2011 Posts: 120 Vancouver,Canada	Ok you know you've been in the garage for too long when this sort of stuff happens.I got the numbers ass-backwards...the heads in question are 3751213 and 3769902...the 902 heads are from a 1974 400/440 and the 213 heads are from a 1973 400/440 motor home...(shaking my head at yet another mess-up)...thanks Dave

Re: 312 and 902 heads...what's the difference??? [Re: 70 Roadrunner*] #1415067 04/06/13 12:21 PM 04/06/13 12:21 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	vertually the same head will not make a difference to the motor.

Re: 312 and 902 heads...what's the difference??? [Re: Dodgem] #1415068 04/06/13 03:28 PM 04/06/13 03:28 PM
Joined: Jan 2010 Posts: 1,089 st.cloud fl D d-150 Smarter than a 5th grader?
d-150 Smarter than a 5th grader? D Joined: Jan 2010 Posts: 1,089 st.cloud fl	213 heads have extra cooling holes from block to head

Re: 312 and 902 heads...what's the difference??? [Re: d-150] #1415069 04/06/13 05:05 PM 04/06/13 05:05 PM
Joined: Jan 2003 Posts: 2,734 Charlotte, NC 4 446acuda master
446acuda master 4 Joined: Jan 2003 Posts: 2,734 Charlotte, NC	Also some 213's and some 452 heads use tapered seat spark plugs and will also have to extra cooling holes as mentioned above. These are usually found on 440-3 engines.

Re: 312 and 902 heads...what's the difference??? [Re: 446acuda] #1415070 04/08/13 02:25 AM 04/08/13 02:25 AM
Joined: Dec 2011 Posts: 120 Vancouver,Canada 7 70 Roadrunner* OP member
70 Roadrunner* OP member 7 Joined: Dec 2011 Posts: 120 Vancouver,Canada	Guys thanks for answering my questions...they both are for 400/440 plants so I should be ok I guess...what the hell,I'm learning!

Re: 312 and 902 heads...what's the difference??? [Re: 70 Roadrunner*] #1415071 04/08/13 12:43 PM 04/08/13 12:43 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Just use the heads, they will both respond to porting, even the MP porting templates will help. I have a pair of 213 heads from a Newport 2-barrel 400 and THEY DO NOT HAVE THE EXTRA COOLING HOLES. And they take regular spark plugs. I'd probably prefer that they used the peanut plugs, as those 3/8" reach gasketed plugs are not hanging on the wall at WalMart any more. As with everything else Mopar, never say never. R.

Re: 312 and 902 heads...what's the difference??? [Re: 70 Roadrunner*] #1415072 04/08/13 07:49 PM 04/08/13 07:49 PM
Joined: Jul 2008 Posts: 259 Khemi, Stygia Mebsuta enthusiast
Mebsuta enthusiast Joined: Jul 2008 Posts: 259 Khemi, Stygia	My 383 RR is like that; 213 on one side and 902 on the other. I pulled those heads off a 400 truck in a junkyard because that's what I could get to replace 906s. Mine has been like that(213/902)since 1995 or so and I have no plans to take them off. There are no extra holes or special plugs or anything. 68 Roadrunner. 383 4-spd. Beat up.

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