Anybody know the bore and stroke of the 254 inline flathead six? Just curious. I know this engine was in use thru 1948 and assume it was avail in light pickups (it has a smaller displacement brother too). My books show 104 hp at 3000 rpm and 212 ft lbs at 1200 rpm, but I cannot find the bore and stroke. Any other info on this engine would be appreciated, such as no of main bearings (assume 4).

 

The 'M' series engine had a bore of 3.50 and stroke of 4.40. My shop manual shows hp of 110 @ 3400 rpm. Firing order and compression ratio were the same as the 'H' series (226).

 

Thanks, Upon further research I found the 110 hp figure, but didn't have the rpms. Either my 104 hp is a mistake or it varied over the several years. I also read that Ford made an inline six in 1908. Other than that, it seems the 226 and 254 (a.k.a. "Big Six" or "Rouge 254") are the only flathead inline sixes Ford ever made.

 

 

I just purchased a ford 9N with this engine, the motor runs fine but the carb leaks like a sieve. So first off I want to rebuild the carb. In addition I am trying to find as much information about this motor as possible so that I can check all critical values and possibly do a rebuild at some point. My main concern with the motor is that the oil pressure is showing as ~20psi. Is this normal for this motor? Also would like to know what weight of oil I should use.

The motor is 8MHT-6015

The number on the side of the carb is 0-1533. Does anyone know how to determine the carb model number and if there is a rebuild kit available?

Thanks,
Ethan

 

Henry did not like inline six motors after his experience with the model K (make in 1906 an 1907 I think). Edsel convinced him to bring out the new flathead six in 1941, kind of sneaking it through as a truck engine first. It was labeled the G series and had 226 cubic inched from a 3.3 bore and 4.4 stroke. In late 1947 the engine was updated with a conventional distributor and oil pump among other things and labeled the H series. About that time Ford needed a power plant to put in city buses, so they cast a large bore version of the H motor. This big bore six, labeled the M series, had a 3.5 inch bore and shared pistons with the big 337 cubic in Lincoln / F-7 & F-8 motor. The M proved such a good engine they soon made it available in F-6 duty trucks. This worked so well they kept the M as an option through 1953 even though production of the H series it was derived from ended with the 1951 model year! Horsepower varied somewhat throughout production with camshaft changes and different intake manifolds for updraft carburetors on the cab over trucks. 110 horsepower at 1800 rpm and 212 foot-pounds of torque at 1200 rpm are fairly representative. The 1953 manuals claim to have a flat torque curve from 1200 to 1700 rpm, but how different this really was from previous years is anybody's guess. Ethan - I think the relief valve in the oil pump opens around 30 psi, so unless you are really beating on it, 20 is probably fine. I really like the way 15-40 diesel oil runs in my flatheads. It holds better oil pressure when hot.

 

Auto zone , Oreillys , Advanced Auto all have parts for a 1950 Ford Pick up with the 226 flat six .

Water pump , carb kit , tune up , fuel pump , lots more .

Need help with the 9N come on over to the ntractorclub.com