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1970 340 heads (non-T/A) #2163056 09/27/16 07:21 PM 09/27/16 07:21 PM
Joined: Jan 2003 Posts: 17,514 Las Vegas, NV 6bblgt OP I Live Here
6bblgt OP I Live Here Joined: Jan 2003 Posts: 17,514 Las Vegas, NV	how far into the model year did left over "X" heads * 2.02"/1.60" (cast #2531894/part #2531902) get used? how to ID an authentic "U"/"O" head * 2.02"/1.60" (cast #3418915/part #3577053) used for a '70 model year car? were there other letters used "J"/"Z" in '70? when did the "360" casting start to show up on #3418915 heads?

Re: 1970 340 heads (non-T/A) [Re: 6bblgt] #2163113 09/27/16 08:59 PM 09/27/16 08:59 PM
Joined: Jan 2003 Posts: 43,512 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,512 Round Lake Beach, Illinoisy	I have a 70 340 for sale and it has O heads with 360 cast into them. The block was cast 11-17-69 and I forgot when the heads were cast, but they were close to the date of the block. I will check it again tomorrow and let you know! The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

Re: 1970 340 heads (non-T/A) [Re: Rhinodart] #2163119 09/27/16 09:15 PM 09/27/16 09:15 PM
Joined: Jan 2003 Posts: 17,514 Las Vegas, NV 6bblgt OP I Live Here
6bblgt OP I Live Here Joined: Jan 2003 Posts: 17,514 Las Vegas, NV	VIN #?

Re: 1970 340 heads (non-T/A) [Re: 6bblgt] #2163120 09/27/16 09:17 PM 09/27/16 09:17 PM
Joined: Jan 2003 Posts: 43,512 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,512 Round Lake Beach, Illinoisy	I'll get that too... The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

Re: 1970 340 heads (non-T/A) [Re: 6bblgt] #2163183 09/27/16 10:29 PM 09/27/16 10:29 PM
Joined: Jan 2003 Posts: 6,840 The Swamp S Sixpak master
Sixpak master S Joined: Jan 2003 Posts: 6,840 The Swamp	AFAIK, 915's were always 360 heads. I've never seen an O, J, Z or U head with anything but 360 cast into them. Also seen 587 J heads with the hardened exhaust seats in 73. But I'm sure someone will prove me wrong..lol

Re: 1970 340 heads (non-T/A) [Re: 6bblgt] #2163203 09/27/16 10:54 PM 09/27/16 10:54 PM
Joined: Feb 2015 Posts: 2,070 CA C crackedback top fuel
crackedback top fuel C Joined: Feb 2015 Posts: 2,070 CA	Mid-December built 1970 Dart had X heads. Probably more a function of what was on the shelf when heads were pulled. Inventory control then is nothing like it is now.

Re: 1970 340 heads (non-T/A) [Re: crackedback] #2163679 09/28/16 02:31 PM 09/28/16 02:31 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	They all had the 360 (although Mopar never say never). It didn't mean the head came on a 360. I have never heard of an explanation from someone who would actually know. R.

Re: 1970 340 heads (non-T/A) [Re: dogdays] #2164051 09/28/16 11:48 PM 09/28/16 11:48 PM
Joined: Aug 2005 Posts: 299 Hinckley, Ohio KWF340 enthusiast
KWF340 enthusiast Joined: Aug 2005 Posts: 299 Hinckley, Ohio	My late September built '70 Dart had X heads. My '70 Duster did not - unfortunately I don't know the build date of the Duster but it was not before early January of '70. Last edited by KWF340; 09/28/16 11:59 PM. 1968 Charger R/T, 440 Auto, GG1; 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, Twin Turbo, Torch red.

Re: 1970 340 heads (non-T/A) [Re: 6bblgt] #2167623 10/04/16 11:43 AM 10/04/16 11:43 AM
Joined: Jan 2003 Posts: 43,512 Round Lake Beach, Illinoisy Rhinodart Rhinotruck
Rhinodart Rhinotruck Joined: Jan 2003 Posts: 43,512 Round Lake Beach, Illinoisy	The heads on my engine were cast on 11-4-69 and 12-2-69 and have large "O" on them. VIN on the block is 0B423350. The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it. JB Rhinehart, Realist A-Body's RULE!

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