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304 vs 360 Crankshaft |
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waggygreen
AMC Fan Joined: Jul/22/2021 Location: Pa Status: Offline Points: 25 |
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Posted: Aug/04/2021 at 11:32am |
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Can anyone confirm what I have been told is that the AMC 305 and the amc 360 crankshaft are interchangeable. |
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mstrcrftr
Supporter of TheAMCForum Joined: Jul/12/2010 Location: houston Status: Offline Points: 2066 |
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yes they are. just make sure that you use one that fits your flywheel-flexplate.
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4867 |
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AMC 304 and 360 crankshafts are identical crankshafts year by year. 70 and 71 have a different flange than the 72 and later crankshafts.
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70 Javelin SST, second owner, purchased 1972
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waggygreen
AMC Fan Joined: Jul/22/2021 Location: Pa Status: Offline Points: 25 |
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Would they need any balancing difference then each other or is everything the same plug and play |
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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Yes they would need balancing. They are not balanced the same.
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waggygreen
AMC Fan Joined: Jul/22/2021 Location: Pa Status: Offline Points: 25 |
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Thank you for all the help. |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5787 |
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When you say that, I presume you just mean that you need to use the 360 harmonic balancer and flex plate, as far as I was aware, the crank itself is the same.
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I've finally given up drinking for good...........now I only drink for evil.
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tufcj
Supporter of TheAMCForum Supporter of TheAMCForum Joined: Jul/10/2007 Location: Watkins, CO Status: Offline Points: 4066 |
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Because the 360 pistons are bigger and weigh more, the 360 crank counterweights probably have less material drilled out so they are slightly heavier. It's always best to have the entire rotating assembly balanced when mixing/matching parts. Bob tufcj Edited by tufcj - Aug/04/2021 at 5:25pm |
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69 AMX
74 Javelin AMX 67 Rogue If you need a tool and don't buy it... you'll eventually pay for it... and not have it. Henry Ford |
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Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6762 |
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Just for reference I have 304 and 360 stock piston/pins/707 rods. The 304's are 1425g and the 360's are 1556g total.
A 707 rod - 686g and pin - 169g are the same for both. I left out the decimal places as these are averages. pistons and rods can vary up to 4g each.
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SC397
AMC Addicted Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5428 |
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The crank itself is the same but remember, each rotating assembly was balanced individually regardless of cubic in size. No two are the same. So regardless of the pistons and rods involved each engine needs to be rebalanced. Some Machinist leave the crank alone and balance the rest of the parts to match. Some do a combination of balancing the crank and rotating components to match.
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