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Small Block heads for sale, U and X head

Started by Cbridgewater, July 31, 2019, 07:15:14 PM

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Cbridgewater

Bought these heads for my 340, found out after magging that the U head has some cracks that I really don't want to mess with. The X head is crack free. Both are 2.02/1.60 valves. Again, U head has some cracks between valves and between plug and valve. Make me an offer! Buyer will of course pay all shippings costs.

Cbridgewater

Here is the X head

Cuda_mark

I've never owned a small block but I always wondered what the difference was with U vs X.

Did the TA's and AAR's come with the X heads?


blown motor

I've never heard of U heads. Were they very common? What engine and era?
Who has more fun than people!
68 Charger R/T    74 Challenger Rallye 
12 Challenger RT Classic    15 Challenger SXT
79 Macho Power Wagon clone    17 Ram Rebel

formula_s

Quote from: Cuda_mark on August 01, 2019, 05:47:39 AM
I've never owned a small block but I always wondered what the difference was with U vs X.

Did the TA's and AAR's come with the X heads?



J heads.





Cbridgewater

Took another look this morning. The U head has a 360 stamp on it, while the X head has a 340 stamp. From what I understand, both can be used on a 340.

6bblgt

1968-1969-(first half) 1970 model year 340s used "X" heads cast # 2531894 with 2.02"/1.60" valves

(second half) 1970-1972 model year 340s used "J", "O", "U", "Z" heads cast # 3418915 with 2.02"/1.60" valves (at some point & on 360s with 1.88"/1.60" valves)

340+6 T/A heads are "J", "O", "U", "Z" heads cast # 3418915 with offset intake pushrod holes and 2.02"/1.60" valves

1973 model year 340s used heads cast # 3671587 with 1.88"/1.60" valves (also used on 360s)





kawahonda

6bblgt, can you elaborate a little more?

What would a November '69 built Challenger 340 have?
1970 Dodge Challenger A66

6bblgt

IMO the transition from "X" to the 915 head was somewhere around the end of calendar year 1969 (I'd expect "X" heads on a Nov. '69 car)

@Cbridgewater can you post pics of the cast date codes?  & where's your location?

anyone have a "915" head with a 1969 date on it?

Cbridgewater

Located in California near Modesto. I'll get a photo this afternoon.

kawahonda

Yep, I think you're right. My J heads were made July 8th, 1970.

No one has been able to produce a photo of a 69' built J head (915) that I've seen.

1970 Dodge Challenger A66


Teslasbrain


Cbridgewater

Here are pictures of the stamping on the head.

kawahonda

1970 Dodge Challenger A66

1 Wild R/T

How about a 70 Cuda?  Got one in my shop right now with J heads...  Prior to me it was un-molested... I on the other hand have molested it.... Just call me Chester...