weber one
I have 67 cj5 304 cid got new 401 not sur year direct swop exsrpt fly wheel rite rong?
tufcj
Welcome to Bulltear.
It will be a direct swap if both engines are 73 or newer. The 304 and 401 have the same external dimensions and use the same accessories. AMC V-8s are externally balanced using the flywheel/flexplate and harmonic balancer. For the 401, you'll need a 401 specific harmonic balancer and flywheel. The only other differences are the harmonic balancer/lower pulley on pre-73 engines have 3 bolts, later engines have 4. Pre-72 engines have a shorter water pump/pulleys and the flange on the back of the crank is different so it will be important to know what range of years both engines fall in.
There are "stickys" here with a lot of the info on casting numbers and years. Take your time and look around.
Bob
tufcj
weber one
my cj is a 76 it is origeinl 304 the 401 is some thing I picked up I was told it was all rebilt then droped on concret then pased arond never put in vehikel I opened it up all new. looking for numbers or some way of telling what year of engine I got it with out fly wheell it has three bolt harmonic balanc and point dissturter.
tufcj
Your original post said 67. Look on the passenger valve cover. There should be a small plate with one screw. It will have 3 numbers, a letter, then 2 more numbers. This can be decoded to the month, year, and day of manufacture. Look on the side of the block under the motor mount, the displacement is cast into the side of the block. If you have the valve cover off, post the casting number, and also there MIGHT be a single or 2 digit year code on the end opposite the casting number.
You are right. Just get the right flywheel for the crank on your 401, and the rest will bolt in.
Bob
tufcj
weber one
yes I tiped in the year of my jeep rong it is a 1976 ok on the side of the block in big numbers cast 401 on the back of the block on bellhosing flange thare is a number cast thar it is 3198951 And in side the valve cover 3216090-1 and thar is all so what looks like a tag that was cast in the hed with numbers E-22.
tufcj
The 951 block is a 401 used from 1971-1978. The 090 heads were 360/401 from 1973 (very desirable heads). Since yours has a 3 bolt harmonic, I'd bet it's a 73. They went to 4 bolt harmonic in 74.
Bob
tufcj
weber one
Thank you this site has ben varry informetiv wish I had ran acrost your site wen I did the HEI on my jeep mine ran about six hours then striped disibeter gear on cam made shere that new gears meshed rilly well and put back to gether and havent had aney truble sence probly about 300 miles
