1stcharger

I'm new to mopars, I have a 71 charger with a 400 that's runnin pretty rough has a low end knock and lifters are rattling, I'm thinking about pulling the 400 and putting a 440 in, the 440 is out of a rv so from what I read it has crappy heads. Will the 400 heads fit in the 440? is it worth the effort to swap it or should I just keep and fix the 400

Iowan

You got oil in the pan?

1stcharger

Yea just put the pan back on after checking the bearings and a new oil pump becuase I'm getting no oil pressure, nothin to the sending unit, and nothing splashing on top of the motor

NCC1968

Is the shaft and pump actually turning?

1stcharger

I took the cap off and spun the shaft from the pan and the rotor turned

NCC1968

You may have a bad pump.........it happens. You can take it off and spin it with a drill.......check 'er out.........

Iowan

The only time I've had a big block with no oil presser was when the presser relief valve stuck open in the oil pump, broken spring behind the piston.

1stcharger

I'm counting on it shouldn't be that it's a brand new high wolume oil punp

NCC1968

That can happen too. I've had some low b/c spring was crap.

Magoo

---- If the 440 is decent, low miles etc., I'd go with it. - Improve it over time, and your car will be worth more, come sale time. -- Good luck with whatever you choose.

dgbcharger

Pull the 400 and combine it with the 440 crank etc. etc. you'll have a whopper stroker motor.