mopar flathead = lead????

these have hardened seats from the FACTORY?????????? just heard this from a close friend that has built and raced a few of these motors before.. just curious... cause i HATE having to add lead... he said he drove for 4-5 years on his w/o lead, and when he went to rebuild, no damage,.. anyone wanna chime in on this?? mopar guys??? plymouth52??

 

I've heard the same thing, but have never run one myself

 

Alos curious cause I have a 40-42 dodge 4-banger flattie that would be kinda cool in something.

 

anyoneelse??????????

 

Are you askin' about lead in the fuel? If so, don't sweat it too much. It wa basically just a cooling agent and didn't do that much to begin with. If you are truly worried about it I've heard that marvel mystery oil will make up for the unleaded fuels. You can't hjold me to that, but that's what I've haerd.

 

The big sixes, the ones in full sized trucks and othe commercial applictions, as well as the Industrial engines wuld ave had hardened seats and, in some cases, sodium-filled exhaust valves.

The small sixes, the short ones found in the Dodge and Plymouth p***enger cars and pick-ups, wouldn't have come with hardened seats.

 

all mopar flatheads have had hardened exhaust seats since 1935-1937 some where in there. when I had a 230 rebiult 3 years ago the engine Guy didn't believe it either. He does now....They are good and tough engines, keep the rpms reasonable, the will run along time. Waterboy.... .

 

I have been told not to worry about having hardened seats and or using the lead additive with fuel stops. I have been informed by many engineers and mechanics alike that this is only a problem with high RPM and very extended milage engines. How much do you plan to drive the engine and how hard is the question.

 

Waterboy is correct, both short and long block mopar flathead six engines have hardened exhaust seats from the factory.

This topic has been covered many times over on the P15-D24 site, with MoPar literature to back it up.

Pete

 

my 6 has harded seats and i have ben driving it for 8 yers no problems and i rase hell with it ie: floating the valves at about 105mph but then again i have a race balince on the rotating acembily with .030 over pistons and a shaved head