1972 340 stock motor
#2630635
03/09/19 04:55 AM
03/09/19 04:55 AM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
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robin hood country
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From what i've read, the 72 340 motor had the comp dropped 2 points, the 1.88 valve heads and is rated at 240 net HP, which, when converted, is not very far behind the 71. Has anyone on here had, or has a 72 340 A body and what sort of performance should i expect in comparison to the earlier motor ? Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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Re: 1972 340 stock motor
[Re: deaks]
#2630636
03/09/19 05:40 AM
03/09/19 05:40 AM
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Joined: Feb 2006
Posts: 608 TN
1DGEMAN
mopar
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mopar
Joined: Feb 2006
Posts: 608
TN
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Back in 72 when I first ran NHRA stock eliminator I had a 71 Duster 340 4sp it set the record in E/S at 11.97 at 112.92 it weighed 3290. in 73 I bought a 72 Demon it set the record in H/S at 11.96 at 113.35 it weighed 3380. Both of these engines had the same technology in them at the time. The compression was not a big deal and the 1.88 intake didn't hurt it either. With the gas we have today the 72 with iron heads works just fine.
Real Men shift for themselves
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Re: 1972 340 stock motor
[Re: deaks]
#2630671
03/09/19 10:01 AM
03/09/19 10:01 AM
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Joined: Aug 2006
Posts: 2,525 God's Country Maryland
GODSCOUNTRY340
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master
Joined: Aug 2006
Posts: 2,525
God's Country Maryland
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This is my real world experience. In 1979 I had an original '69 340 Swinger with the 10.5 engine. I added a cheap JC Whitney .500/300 hyd. cam, headers, 3500 B&M Super Holeshot converter, 513 gears, Holley 800 spread bore carb (with adapter), X heads. The Dart ran a best of 12.88 @ 112 mph. I blew that 340 up, found a '72 short block and put the cam, distributor, X heads, headers, carb & intake from the blown up 340 on it. The best that engine would do was 13.44 @ 108mph.
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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Re: 1972 340 stock motor
[Re: GODSCOUNTRY340]
#2630686
03/09/19 10:47 AM
03/09/19 10:47 AM
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Joined: Feb 2005
Posts: 20,186 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,186
PA.
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Sorry I had a 1972, 340, 4 speed and it was fun but wasn't what I wanted so I modified it. It was kinda cool hearing the thermaquad opening up but the fun was short lived. I made it even more FUN.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 1972 340 stock motor
[Re: pittsburghracer]
#2630690
03/09/19 10:55 AM
03/09/19 10:55 AM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
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Posts: 3,210
robin hood country
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My race car was originally a factory 340 4 speed, i'm looking at a matching numbers 72 A body, would like to think it would turn at least high 14's without pulling the engine apart.
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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Re: 1972 340 stock motor
[Re: deaks]
#2630692
03/09/19 11:01 AM
03/09/19 11:01 AM
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Joined: Feb 2005
Posts: 20,186 PA.
pittsburghracer
"Little"John
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"Little"John
Joined: Feb 2005
Posts: 20,186
PA.
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My race car was originally a factory 340 4 speed, i'm looking at a matching numbers 72 A body, would like to think it would turn at least high 14's without pulling the engine apart. For sure. And 13's with a GOOD tune and some track testing.
1970 Duster Edelbrock headed 408 5.984@112.52 422 Indy headed small block 5.982@112.56 mph 9.42@138.27
Livin and lovin life one day at a time
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Re: 1972 340 stock motor
[Re: pittsburghracer]
#2630735
03/09/19 12:53 PM
03/09/19 12:53 PM
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Joined: May 2004
Posts: 3,210 robin hood country
deaks
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OP
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Posts: 3,210
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Setting the car up won't be a problem, i'd be happy with mid low 14's if it's stock.
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200# best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft best 60ft 1.36
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