Posted By: 411Dude
440 source heads on factory 440 Magnum block - 11/26/13 04:47 PM
I'm not sure if anyone has covered this question. I have an original 69 440 magnum factory pistons, etc. (Grandmas 69 Charger R/T) If I pulled the 906 heads off and put 440 source heads, on would there be any valve to piston problems, large compression ratio changes, or other issues. I was considering this for the weight savings, factory look, and a bit more hp. I have a mopar m1 factory style alum. manifold also. Has anyone done this?
Posted By: dogdays
Re: 440 source heads on factory 440 Magnum block - 11/26/13 04:53 PM
Well, the valves are in the same location or nearly so on both heads.
The compression ratio may increase by half a point but the engine should actually be able to use one grade lower gasoline.
Buy'em and have someone go through them and correct valve guide clearance, possibly do a better valvejob and you're set.
440Source springs should work just fine with a reasonable cam.
R.
Posted By: GTX MATT
Re: 440 source heads on factory 440 Magnum block - 11/26/13 05:21 PM
Depends on the cam, check it with clay its not too hard. You should be OK though if its a mild cam. You will get a compression increase for sure, my Stealths CCed between 78 and 81 CC.
Posted By: 68KillerBee
Re: 440 source heads on factory 440 Magnum block - 11/26/13 07:04 PM
Put them on my 383, straight out of the box along with a 383 rpm intake from a stock one. Took 1/2 second off my 1/4 and don't use oil anymore. If you buy them through 440, I would just have them add the better retainer/ locks.
These should be just the thing you are looking for along with a better than stock intake.
Posted By: dogdays
Re: 440 source heads on factory 440 Magnum block - 11/26/13 07:33 PM
If it's a stock shortblock and there's no V/P clearance now, there shouldn't be any with the new heads and same cam.
It never hurts to check, but don't let that worry stop you. You'll have about as much clearance as you have now. Think about it, the Source head is basically a copy of a 915, and the 906 is the same except for the open chamber. Valves are in the same location in space. You can usually run the stock rockers on the Source heads, too.
R.
Posted By: therocks
Re: 440 source heads on factory 440 Magnum block - 11/26/13 07:56 PM
The M1 wont like a pretty much stock motor.Its more of a race manifold.Better to sell it unless you are building a more radical motor.Buy a Holley intake.Rocky
Posted By: 411Dude
Re: 440 source heads on factory 440 Magnum block - 11/26/13 08:14 PM
Thanks guys that helps a lot on my decision. the intake I have is not an M1 its a P 4529118 mopar performance out of production. basically a rough copy of a 440 magnum original intake only aluminum.
Posted By: dogdays
Re: 440 source heads on factory 440 Magnum block - 11/26/13 08:14 PM
He said it was an M1 Street manifold, which I take to be dual plane. Not all M1s were single plane.
R.
Posted By: therocks
Re: 440 source heads on factory 440 Magnum block - 11/27/13 12:40 PM
Which Source heads do you have?If the early ones check the chamber close.Some gaskets overhang into them.I run the Marine gaskets on mine.Been on 4 years or so and street driven.No problems.Rocky