I have an opportunity to purchase a 1968 Plymouth GTX, 440 with 727 trans. from my uncle's estate and doing some research on how to determine if the engine and trans. are matching numbers. I have been told that in the year 1968, there wasn't always an engine or trans. stamp. Can someone verify?

Thanks.

 

You're going to want to check two places on the engine, on the flat raised area behind the water pump housing on the top of the engine, as well as above the oil pan. I also believe there should be a flat spot above the oil pan on the trans, but I am not 100% sure on that.

 

2x on what he said
above the water pump, on the ridge, there will be a stamp, and the year the block was used in
on the side of the block, there will be casting numbers

 

Didn't some of the '68's have the sequence number stamped on a pad at the back of the block, near the top of the bellhousing mounting surface?

 

All very helpful info. Thanks. What I have determined so far is that the #2536430-6 is a 1968 440 block. There is another number below that number, S667D that I am unsure of what that relates to. Anyone know what this number means?

Also next to the distributor is stamped D 440.

 

The D440 is correct for a 68 440

 

Thanks.

 

It would not be unheard of... my understanding is that if it was an early 68 build Chrysler they would use the 67 parts up first. i still have my original 440 intake manifold sitting in a box with a 68 casting number on it, though im not sure what time of year my actual motor was assembled all of the parts say 68 although its not really relevant for my project lol. good luck friend.

 

I want to see more of this car. Have a 68 satellite convertible myself, wish it was a gtx.

 

who cares if its original as long as its a REAL GTX buy it buy it buy it

 

I have heard that prior to 1969 there were no true matching number cars as the VIN was not stamped on the engine and trans. There are date codes that would make it the likely original motor but that is as close as it gets. I hope this helps.

 

Condor, some of the '68's were numbered, some werent'. I don't know what the distinction was as to which got numbered and which didn't. The numbers for the 68 block were behind the intake, on the top edge of where the bellhousing bolted to the tranny. Not sure, but I think the number was coded to the sequence number of the build plate instead of the VIN, but it will be one of the two. I do know all the secret numbers stamped on the bodies are of the sequence number from the build plate, and not the VIN.

 

Thanks for the info BuckNeccid. I know for sure 67s were not numbered and they started stamping them some time in 68. I guess it would make sence if the vehicle was an early build date then it would be less likely to have vin or build plate number.