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What is the difference between an AMC 69 and 70 39 |
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69kermit
AMC Apprentice Joined: Oct/23/2014 Location: El Cajon, Ca. Status: Offline Points: 37 |
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Posted: Sep/17/2018 at 11:31am |
everything I have read that the bore and stroke for a 69 and a 70 390 is the same so what is the difference between piston themselves?
Edited by 69kermit - Sep/17/2018 at 11:50am |
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mmaher94087
AMC Addicted Joined: Apr/01/2008 Location: Arizona Status: Offline Points: 1690 |
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Pistons; not sure beyond the valve relief. '70 block is taller and the rods longer.
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Mike
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304-dude
AMC Addicted Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Different sized head bolts, a wee bit more beef in the main webbing, a taller deck height, and different crank, pistons and rods.
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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FSJunkie
AMC Addicted Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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Heads. The 1970 390 is a 1969 390 on Flonase. Less congestion.
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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ADAM12MATADOR
AMC Addicted Joined: Dec/03/2011 Location: New City, N.Y. Status: Offline Points: 518 |
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The 68-69 rods are 5.790 long and the 70 rods are 5.858 long. I believe the diff in the pistons are the location of the pins in regards to the piston height.
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