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Re: From 273 to 360 engine in a 65
[Re: cudaman1969]
#3215313
02/22/24 09:40 AM
02/22/24 09:40 AM
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Joined: Dec 2004
Posts: 801
central CT
cudazappa
super stock
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super stock
Joined: Dec 2004
Posts: 801
central CT
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I did the flexplate on my 360 swap. Less headaches = worth the money to me.
1971 Challenger
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Re: From 273 to 360 engine in a 65
[Re: poorboy]
#3215331
02/22/24 11:47 AM
02/22/24 11:47 AM
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Joined: May 2019
Posts: 6,241
nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,241
nowhere
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From my experience, if the crankshaft hub on the 360 is smaller then the hub on the converter, you are pretty screwed. A modern converter didn't fit in the trans, and the difference between the two hubs kept the flex plate too far away from the converter. That was years ago, things may be different now, but back then it couldn't be done with out changing the pump on the trans so the modern converter that fit into the crankshaft hub could be used. You have it backwards, the hub on the early torque converter is smaller than the ring on the later crankshaft. Wildcat Auto sells, or used to, an annular ring to address that. I bought one a couple years ago to stuff an 87 318 into my 65 Cuda. As for the engine mounting bracket, the ears on the 273 are wider than the 340/30 ears, on the driver's side. A couple of washers for a spacer fixes that. HOWEVER, there is a missing ear on the later blocks that the 273 bracket uses, you need that ear. Or you can buy a set of Schumacher mounts to address that, if they are being made anymore. I got a set out of Canada a couple years ago and it was hard to find.
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Re: From 273 to 360 engine in a 65
[Re: Sniper]
#3215335
02/22/24 11:53 AM
02/22/24 11:53 AM
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Joined: Dec 2013
Posts: 4,672
Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,672
Wichita
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The "notched" B&M flexplates make it to where you don't have to mess with the weights on the convertor for the externally balanced 360.
Last edited by GY3; 02/22/24 11:53 AM.
'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: From 273 to 360 engine in a 65
[Re: cudaman1969]
#3215451
02/22/24 06:45 PM
02/22/24 06:45 PM
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Joined: Jan 2003
Posts: 8,485
Candler,NC / Myrtle Beach, SC
JDMopar
master
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master
Joined: Jan 2003
Posts: 8,485
Candler,NC / Myrtle Beach, SC
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I'm pretty sure there are 2 different B&M flex plates for the LA 360. One for a 904 and another for a 727. The flex plates are engine specific, so they won't swap from a 360 to anything else without the engine you move it to shaking your teeth out. As mentioned about the exhaust manifolds, be sure to fit the drivers side manifold to the 360 head to make sure it will fit flat at the rear (#7) exhaust port. Most of the later 70's smogger heads have a bump on the head that keeps the early A exhaust manifolds from fitting flush. It's right at the back bottom edge of the drivers side head. If you don't notice it and start cranking down the exhaust manifold bolts, POW......you broke your manifold! If it hits, there might be a set of Doug's D450's in your future! As far as the drivers side motor mount goes, getting 340-360 mounts from Schumaker will be the Easy Button, but you can weld a triangle shaped piece to your existing mount and drill a hole so it fits the ear on your 360 block. I'll leave a link below about the rubber part of the motor mounts. Everyone with an Early A needs a copy....lol. Good luck with it! https://earlycuda.org/techdocs/JimBowenTheHolyGrailofMotorMounts.pdf
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Re: From 273 to 360 engine in a 65
[Re: JDMopar]
#3215453
02/22/24 06:57 PM
02/22/24 06:57 PM
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Joined: Jan 2004
Posts: 8,251
fredericksburg,va
cudaman1969
OP
master
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OP
master
Joined: Jan 2004
Posts: 8,251
fredericksburg,va
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I'm pretty sure there are 2 different B&M flex plates for the LA 360. One for a 904 and another for a 727. The flex plates are engine specific, so they won't swap from a 360 to anything else without the engine you move it to shaking your teeth out. As mentioned about the exhaust manifolds, be sure to fit the drivers side manifold to the 360 head to make sure it will fit flat at the rear (#7) exhaust port. Most of the later 70's smogger heads have a bump on the head that keeps the early A exhaust manifolds from fitting flush. It's right at the back bottom edge of the drivers side head. If you don't notice it and start cranking down the exhaust manifold bolts, POW......you broke your manifold! If it hits, there might be a set of Doug's D450's in your future! As far as the drivers side motor mount goes, getting 340-360 mounts from Schumaker will be the Easy Button, but you can weld a triangle shaped piece to your existing mount and drill a hole so it fits the ear on your 360 block. I'll leave a link below about the rubber part of the motor mounts. Everyone with an Early A needs a copy....lol. Good luck with it! https://earlycuda.org/techdocs/JimBowenTheHolyGrailofMotorMounts.pdf Great, I found two new mounts like that in the back of a van at Pic-a-part, so I lucked out for once!
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Re: From 273 to 360 engine in a 65
[Re: JDMopar]
#3215461
02/22/24 07:25 PM
02/22/24 07:25 PM
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Joined: May 2019
Posts: 6,241
nowhere
Sniper
master
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master
Joined: May 2019
Posts: 6,241
nowhere
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I'm pretty sure there are 2 different B&M flex plates for the LA 360. One for a 904 and another for a 727. The flex plates are engine specific, so they won't swap from a 360 to anything else without the engine you move it to shaking your teeth out. As mentioned about the exhaust manifolds, be sure to fit the drivers side manifold to the 360 head to make sure it will fit flat at the rear (#7) exhaust port. Most of the later 70's smogger heads have a bump on the head that keeps the early A exhaust manifolds from fitting flush. It's right at the back bottom edge of the drivers side head. If you don't notice it and start cranking down the exhaust manifold bolts, POW......you broke your manifold! If it hits, there might be a set of Doug's D450's in your future! As far as the drivers side motor mount goes, getting 340-360 mounts from Schumaker will be the Easy Button, but you can weld a triangle shaped piece to your existing mount and drill a hole so it fits the ear on your 360 block. I'll leave a link below about the rubber part of the motor mounts. Everyone with an Early A needs a copy....lol. Good luck with it! https://earlycuda.org/techdocs/JimBowenTheHolyGrailofMotorMounts.pdf Dude, you rock. Those motor mounts are the bomb. lol I forgot about he bump on the head, you are right. I ran into that test fitting the manifold on the stand, ground the bump down.
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Re: From 273 to 360 engine in a 65
[Re: cudaman1969]
#3215593
02/23/24 12:33 PM
02/23/24 12:33 PM
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Joined: Jan 2003
Posts: 4,145
Canada -- Posts: 4034 -Registe...
5thAve
Doesn't care what this says anyway
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Doesn't care what this says anyway
Joined: Jan 2003
Posts: 4,145
Canada -- Posts: 4034 -Registe...
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I want to use the 904 trans that’s behind the 273. I know the converter alignment snub is smaller, (I can make a spacer) but should I get the off balanced flex plate or weights to weld on vert? Do whatever is easiest. For me I've always had a local transmission shop add the weight on to the torque converter.
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Re: From 273 to 360 engine in a 65
[Re: 5thAve]
#3215627
02/23/24 03:04 PM
02/23/24 03:04 PM
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Joined: Jan 2004
Posts: 8,251
fredericksburg,va
cudaman1969
OP
master
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OP
master
Joined: Jan 2004
Posts: 8,251
fredericksburg,va
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I want to use the 904 trans that’s behind the 273. I know the converter alignment snub is smaller, (I can make a spacer) but should I get the off balanced flex plate or weights to weld on vert? Do whatever is easiest. For me I've always had a local transmission shop add the weight on to the torque converter. I’m thinking the easiest way myself. I more than likely will use the 360 engine again but not that 65 cable type 904 trans. So the plate or that add on crank weight will be the way I go. Down the road after I find a 426 wedge the 360 and trans will come out. PS. I need some 426 pistons btw
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Re: From 273 to 360 engine in a 65
[Re: cudaman1969]
#3215648
02/23/24 05:35 PM
02/23/24 05:35 PM
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Joined: Aug 2003
Posts: 43,161
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,161
Bend,OR USA
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[
PS. I need some 426 pistons btw
wedge or hemiroid?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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