Posted By: EV2RUNNER
B engine to RB engine 71 B body.. - 03/02/17 06:35 AM
Hey guys I've decided to pull the original 383 out of my 71 Roadrunner and place it on a stand for safe keeping. I want to replace it with a 68 440. I plan to change out the torque converter regardless.. What else am I looking at changing to make the swap? Forgive me its been a few years and I forget half of what I knew about these cars. Thanks!
Posted By: ozymaxwedge
Re: B engine to RB engine 71 B body.. - 03/02/17 06:42 AM
Exhaust manifold/header will be going up and outward. You got space there ?
Posted By: EV2RUNNER
Re: B engine to RB engine 71 B body.. - 03/02/17 06:47 AM
Yes I should be good there. Thanks!
Posted By: EV2RUNNER
Re: B engine to RB engine 71 B body.. - 03/02/17 06:49 AM
Are the motor mounts different between B/RB ? I can't remeber for the life of me..
Posted By: RapidRobert
Re: B engine to RB engine 71 B body.. - 03/02/17 07:04 AM
the heads set 3/4" higher up at a 45 angle so anything bolted to the front of the heads (alt/power st) may need different brackets & of course the ex headers/manifolds will be raised that amt. Same mtr mts
Posted By: EV2RUNNER
Re: B engine to RB engine 71 B body.. - 03/02/17 07:51 AM
Cool thanks very much Rapid Robert. I have all the Bracketry still on the 440 so I should be good to go.
Posted By: moparmarks
Re: B engine to RB engine 71 B body.. - 03/02/17 08:21 AM
Motor mounts are the same. Could use the 383 torque converter too.
What is the 440 out of? If a C-body then you will need to change the oil pan. Unless you have 383/400 only headers then the exhaust is fine. Not much else to change.
Posted By: JohnRR
Re: B engine to RB engine 71 B body.. - 03/03/17 06:52 PM
Almost everything will swap over ... does the car have A/C or an air grabber hood , there are 440 or 383 specific parts associated with them ? The only thing bolted to the head without A/C is the long bolt thru the alternator and the bracket that is on the 383 has 2 holes , one for a 383 and the other 4 a 440. The power steering attaches to the water pump only so that is not an issue. If the 440 is from a C body the pan will fit in the 71 K with no issues, but it won't have an internal baffle like the Stock 402 pan on your 383. If it's from a B body it will have a 402 pan if stock.
Engine mounts are the same.
If you have Air grabber the air cleaner base is different.
Posted By: moparmarks
Re: B engine to RB engine 71 B body.. - 03/03/17 09:33 PM
"If the 440 is from a C body the pan will fit in the 71 K with no issues."
Will fit but will probably rub against the center link.