Hello friends! Some may have read about the Leadfoot Rally Duster build here.
We put a 340 into a '73 Duster, and it's a pooch. Engine was built 10 years ago, but not wanting to put another motor in the machine shop at the time, we decided to use the 340 for the Leadfoot Rally. When we drag raced the car for the compeitition, it only went a 15.08 at 91 mph best (4800 feet). It did go 130mph on the front strait of the road course.
I'm looking to get the car into the high 13's to race in the Fall Series here in Denver (plan to drive it to the track). I have SS springs, drag race torsion bars (to replace the 383 bars), and either 3.91 or 4.11 gears (to replace the 3.23's). Ordered a 10 inch MP 2800-3000 converter to replace the stock one. Got a 750 HP main body to replace the 650 dbl. pumper.
I fear the MP 509/292 cam (yeah I know, but it was built 10 years ago .. haha) and probably the intake might be costing power. But would like your opinions--comp cam & air-gap?? Here's the combo:
'71 340 .040 over 346cid
KB hyper pistons aprox. 10.25:1 compression
360 J heads 2.02/1.60, bowl blended & port matched (no flow #'s)
M1 single plane intake--too much for this little motor I'm thinking
Hooker super comp headers (1 5/8"), dynomax bullets with turndowns
Mechanical 120gph pump
MP dizzy, msd coil and wires, orange box (have MSD 6al on hand here).
Race built 904 trans, reverse manual valve body (about the only thing that works good on the car .. haha)
I figure the thing can't weigh more than 3000lbs.
I don't currently have a tach in the car, but at about 80-90mph it'll misfire pretty bad. Thing makes alot of noise, which is cool and all, but it's a dog. I'm used to ten second 440's ... 8)
TIA for any advice!
We put a 340 into a '73 Duster, and it's a pooch. Engine was built 10 years ago, but not wanting to put another motor in the machine shop at the time, we decided to use the 340 for the Leadfoot Rally. When we drag raced the car for the compeitition, it only went a 15.08 at 91 mph best (4800 feet). It did go 130mph on the front strait of the road course.
I'm looking to get the car into the high 13's to race in the Fall Series here in Denver (plan to drive it to the track). I have SS springs, drag race torsion bars (to replace the 383 bars), and either 3.91 or 4.11 gears (to replace the 3.23's). Ordered a 10 inch MP 2800-3000 converter to replace the stock one. Got a 750 HP main body to replace the 650 dbl. pumper.
I fear the MP 509/292 cam (yeah I know, but it was built 10 years ago .. haha) and probably the intake might be costing power. But would like your opinions--comp cam & air-gap?? Here's the combo:
'71 340 .040 over 346cid
KB hyper pistons aprox. 10.25:1 compression
360 J heads 2.02/1.60, bowl blended & port matched (no flow #'s)
M1 single plane intake--too much for this little motor I'm thinking
Hooker super comp headers (1 5/8"), dynomax bullets with turndowns
Mechanical 120gph pump
MP dizzy, msd coil and wires, orange box (have MSD 6al on hand here).
Race built 904 trans, reverse manual valve body (about the only thing that works good on the car .. haha)
I figure the thing can't weigh more than 3000lbs.
I don't currently have a tach in the car, but at about 80-90mph it'll misfire pretty bad. Thing makes alot of noise, which is cool and all, but it's a dog. I'm used to ten second 440's ... 8)
TIA for any advice!
