Working on a 360 that was a crate motor from Chrysler # on block 53020006-360 Has a cast damper on front. the flex plate is nothing special and there are no weights on converter, 904 trans. Engine has bad vibration. any ideas?
360 crate motor
- Thread starter EARLY B
- Start date
66Satellite47
Well-Known Member
Pretty sure you need weights on the converter. Not sure what a "crate motor" had for a crank. All OEM 360's were external balanced. Damper & converter.
If it was a stroker.... ??
Yeah you need more info about what you have there
Yeah you need more info about what you have there
Balanced flex plate for a neutral converter
https://www.summitracing.com/parts/...MI79Wh-Nur8AIVAG1vBB3GHQi_EAQYASABEgKUjPD_BwE
https://www.summitracing.com/parts/...MI79Wh-Nur8AIVAG1vBB3GHQi_EAQYASABEgKUjPD_BwE
Thanks for the replys. Will try the flex plate.
1toolguy
Well-Known Member
I've been using an "LA" balancer on my Magnum based 360 for almost 15-years with no problems. I've used that exact flexplate for just as long. First thing I suggest checking is the converter, if it doesn't have any balance weights, most aftermarket units don't, this flexplate is the way to go.
4406bbl
Well-Known Member
Just do a search on the a-bodies only site before you buy anything, there is a thread in 2019 that shows pictures of the flexplates. Magnum and la are not the same, close but not the same.
1toolguy
Well-Known Member
Actually the flexplates, balancers and everything else on the bottom end are the same, the only real differences are the provisions for a roller cam, lack of oiling for the LA rocker shafts (these are drilled on a crate short block, I can only assume that they are for the long block too) and the extra motor mount location (Mopar wisely set the Magnum block up for both LA and Magnum mounts). I have been running LA heads, balancer and flexplate since I put the new engine together 15 years ago.
NOTE: I went with the crate short block because, at the time, it was cheaper than having my block machined and built with the exact same parts AND it came with a warranty (how many machine shops do that?).
NOTE: I went with the crate short block because, at the time, it was cheaper than having my block machined and built with the exact same parts AND it came with a warranty (how many machine shops do that?).
Thanks guys, Looking for a B&M 10241 flex plate if anyone has one?
4406bbl
Well-Known Member
I disagree that la and magnum are the same, swapped a few, but if yours worked out that is great, the balance would have been close. Mopar p5249843 is the weight package for a 360 magnum. Maybe there is a few still out there. Bigblockmopar.com has a diagram of that kit showing where they go for the 360 magnum, both 11"and 10"converters. If you look around you can find the weight size and make your own in a pinch, 1/2"x3/4" comes to mind but it has been 20 years.
4406bbl
Well-Known Member
rolling_Thunder
Well-Known Member
The Crate 360 engines from MP came with the instructions shown above - I had to weld those weights onto my TC back when I put the MP360 300hp crate into my Charger... but I believe now you can get a magnum balanced flexplate
1toolguy
Well-Known Member
If you are using a "factory" style flexplate you need the weights but, using the weights with the flexplate above will result in an imbalance. Both Mancini Racing, who I bought my original 2200 RPM converter, and Hughes, when I upgraded to 3500 RPM, confirmed this.
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