Build Thread Jr's 74 CJ5 "fix" and build as I go...
Posi
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Yes, 360 specific.
Build Thread Jr's 74 CJ5 "fix" and build as I go...
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Posi
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Today I found a Willys L-134, AMC 258, (3) AMC V8 flywheels.
What I found interesting was all 3 v8 flywheels had the counter weight at 4:30 and all with with the same part number 321297219
However, I previously marked the flywheels 304, 360 with a ?, and 360.
Above the counter weight all three has additional casting numbers
The 304 and 360 w/? had L246. The 360 had A317.
After inspected the bore holes and casting numbers I believe I have is 2 304, and 1 360.
I removed the 360 flywheel from my 77 CJ5 w/360 engine (year unknown) Engine paint color 70s
It will be sometime next week for me to package it for shipping.
What I found interesting was all 3 v8 flywheels had the counter weight at 4:30 and all with with the same part number 321297219
However, I previously marked the flywheels 304, 360 with a ?, and 360.
Above the counter weight all three has additional casting numbers
The 304 and 360 w/? had L246. The 360 had A317.
After inspected the bore holes and casting numbers I believe I have is 2 304, and 1 360.
I removed the 360 flywheel from my 77 CJ5 w/360 engine (year unknown) Engine paint color 70s
It will be sometime next week for me to package it for shipping.
Last edited:
Posi
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Posi
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I measured the crank flange recess on the flywheel and found 4.250"
The 2 measuring points were not down to metal clean surfaces.
The 2 measuring points were not down to metal clean surfaces.
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- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
Looking through this I can't tell for sure what version it matches best with...
http://www.planethoustonamx.com/main/amc_flywheels.htm
Best I can tell it should work for a 360, but nothing matches exact to above specs i see on the fw.
I've read some people are saying after a fresh rebuild with new pistons you should have it re-balanced anyways... Wasn't planning a racing 6k rpm engine, so wasn't planning to re-balance it after the fact...
I'll need to do some more research and see what I need to do. I don't want a paperweight 360 after a few uses...
http://www.planethoustonamx.com/main/amc_flywheels.htm
Best I can tell it should work for a 360, but nothing matches exact to above specs i see on the fw.
I've read some people are saying after a fresh rebuild with new pistons you should have it re-balanced anyways... Wasn't planning a racing 6k rpm engine, so wasn't planning to re-balance it after the fact...
I'll need to do some more research and see what I need to do. I don't want a paperweight 360 after a few uses...
Posi
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I wouldn’t put 100% stock into that website. Some good info, but they state a 304 does not come with a counter weight when I know in fact some do.
Include measuring your crank end in your research.
Include measuring your crank end in your research.
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- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
Sounds good - I'll believe you over a random website any day lol.
I'll get the crank end measurement ASAP.
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- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
Well it's only been over a year...
Here's the recent progress getting ready for the Colorado Trip this year again.
Got everything together I needed for the 360 build, except what I was scavenging from the current 304 - so under the knife she went:
Started clean up and refinishing stuff - I used Metalcast paint for a lot of the accessories. The block is just semi-gloss black engine enamel.
Here's the recent progress getting ready for the Colorado Trip this year again.
Got everything together I needed for the 360 build, except what I was scavenging from the current 304 - so under the knife she went:
Started clean up and refinishing stuff - I used Metalcast paint for a lot of the accessories. The block is just semi-gloss black engine enamel.
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- Plumas Lake, CA, USA
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- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
Now we've got the new block in and are working on finishing touches! Let me know what you all think!
and a mock up of finish:
and a mock up of finish:
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Looks awesome! I have a 351w swap that I'm working on, and I don't think I trust myself enough to leave the front clip on while doing the swap...
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- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
I did because it was essentially the same block (mount location and clutch etc) swap between 304 and 360. So with the radiator out, I was able to get the cherry picker high enough to pull it over the grill and put back the same.
If i had to do any motor mount work, or had more time I wanted to spend on it, it could have made for a cleaner finish.
Thanks for looking
If i had to do any motor mount work, or had more time I wanted to spend on it, it could have made for a cleaner finish.
Thanks for looking
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- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
Last night was the home stretch, or so I thought 
Went to fill with coolant, poured out of the block - good news, it was just the block drain plugs being missing. Fixed that.
Back to filling the coolant - ran out of the water pump front or weep hole - couldn't tell for sure. So water pump and radiator hoses will be replaced tonight.
Distributor is ready to stab after oil prime (already @ TDC) and plugs / exhaust etc all hooked up.
This evening "should" be cam break in, as long as there are no more surprises...
Went to fill with coolant, poured out of the block - good news, it was just the block drain plugs being missing. Fixed that.
Back to filling the coolant - ran out of the water pump front or weep hole - couldn't tell for sure. So water pump and radiator hoses will be replaced tonight.
Distributor is ready to stab after oil prime (already @ TDC) and plugs / exhaust etc all hooked up.
This evening "should" be cam break in, as long as there are no more surprises...
lol always something
- Posts
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- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
Right? If this is (and I hope it is) the extent of my issues on getting this garage built 360 going, I'll be ok... I'm hoping to break in the cam, then break in the rings this weekend on a small trip.
So I'm shooting for no more hiccups!
Right? If this is (and I hope it is) the extent of my issues on getting this garage built 360 going, I'll be ok... I'm hoping to break in the cam, then break in the rings this weekend on a small trip.
So I'm shooting for no more hiccups!
good luck, im still fighting mine and its a new motor i rebuilt years ago and has been in storage for awhile, i also have water coming from the water pump weep hole lol
- Posts
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- Plumas Lake, CA, USA
- Vehicle(s)
- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
Got her fired up last night and cam broke in. Ran a bit hotter than I'd like, but was revving 2k to 2.5k RPM stationary to break in the cam. Put a fan in front of radiator to help with the airflow and seemed to help a bit. Was still touching on about 220 degrees F. Little hotter than I prefer, though a lot of friction in a tight new motor build start up.
Tonight is tuning and hopefully road trip to set the rings tonight / tomorrow.
After that a oil change and business as usual again with any luck.
Tonight is tuning and hopefully road trip to set the rings tonight / tomorrow.
After that a oil change and business as usual again with any luck.
coldair
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Got her fired up last night and cam broke in. Ran a bit hotter than I'd like, but was revving 2k to 2.5k RPM stationary to break in the cam. Put a fan in front of radiator to help with the airflow and seemed to help a bit. Was still touching on about 220 degrees F. Little hotter than I prefer, though a lot of friction in a tight new motor build start up.
Tonight is tuning and hopefully road trip to set the rings tonight / tomorrow.
After that a oil change and business as usual again with any luck.
When I break a cam in I have a garden hose ready to spray on the radiator. You don’t want to drench it just enough to cover the core.
Wow dude that’s awesome congrats nothing better than seeing all your hard work come to fruition
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I agree!
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- Plumas Lake, CA, USA
- Vehicle(s)
- 1974 CJ5 ~ Fresh built AMC 360 - SM420 - D20 - D30F with upgraded 30 spline shafts and knuckles & D44R - 4.27 Gears - ARB Lockers F/R - All chrome molly axles - on 33's - YJ 4" Lift Spring Conversion
It's a bit more vibrate-y than I remember... Checked motor mounts, checked all other bolts. Driving it for now. Really hoping it's not the aftermarket flywheel (yeah I know - shoulda / woulda / coulda - got impatient...).
I imagine if that flywheel / crank was out of balance, I'd already have thrown a rod or something... drove it about 50 miles so far.
Might just be the engine still running tad rough during breakin. Sounds great, runs great and strong, just vibrates me a bit. Got some stuff to check out...
I imagine if that flywheel / crank was out of balance, I'd already have thrown a rod or something... drove it about 50 miles so far.
Might just be the engine still running tad rough during breakin. Sounds great, runs great and strong, just vibrates me a bit. Got some stuff to check out...