Classic Mustang General DiscussionMake your non-Technical threads/posts in here.
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Trying to tell if this is the original CJ in my Q code 73 Mach 1. Eyeballing looks to be a least a Cleveland. Has the 4 cast in the head upper corner and the water jacket for the heater hose is built into the block not the manifold. What do you think?
Not sure what this cast number is in the head. Date the head was cast maybe?
The 4 cast in the head near intake indicating V4.
Heater hose/thermostat in the block.
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Notes on 351C Block Casting Numbers
Be careful what you read on the internet. Boss 351s were produced with at least two different casting numbers, one of which is shared with 2-bolt main, non-Boss 351C engines of the era - casting number is DOAE-L. For the Boss 351, Ford drilled this 2-bolt block to accept 4-bolt main caps. Most DOAE-L blocks have 2-bolt main caps. For the 351-4V CJ engine, many websites will tell you that the block casting number is D2AE-CA. Indeed, every 351C-CJ I've seen used the D2AE-CA block, but I've also seen this same block in 2V 351C Torino station wagons, with 2 bolts on all five caps. Again, it's a case of Ford selectively drilling blocks to accept 4-bolt main caps. So if you find a D2AE-CA engine, remove the oil pan and inspect the main caps before purchasing it.
I find a lot of different information all over the Internet LOL.
I think the statement above is consistent with what I said.
Agreed. I just thought it was interesting that it says the Boss 351 also could have that casting number.
Form the Boss 351 Registry:
Boss 351 block cast numbers
Ford part Number
Block stamped number
The Earliest Date code you will find a for a stock engine would be April 1970 that would be" D " All boss blocks that were installed in cars were DOAE the nest casting was D2ae this is one year after the cars were built . No boss 351 had screw in freeze plugs and the two bolt blocks were no weeker than the boss blocks . We were told for a matching numbers block it needed to be with in 6 weeks of the build date of the car. The D1ZE-a or D1ZE-B was a part number stamped into the blocks a long with the build date. some people confuse this with the casting number.
Picture of the block cast numbers on a 71 R code Boss 351
You definitely have a 351C w/ obviously 4 bolt mains. As far as I know the only difference between a 351C and a 351CJ was the CJ came with a different intake & spread-bore carb. I just checked my 351CJ block and it has the same numbers as yours. I have owned this car/engine since 1977. That being said the 351C and 351CJ are not Boss 351 engines. The Boss 351 had solid lifters, shot-peened & magnafluxed rods.
I don't think Ford did the numbers matching thing to the extent of GM and maybe others.
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