roscoe69

Thanks to all you guys ( and my local car quest guy ) I got all of the ignition parts and got her running, I had to get a little ceative to get the B421 home though; the old stewart-warner electric fuel pump was shot so I rigged up a el cheapo one, strapped the safety can of gas down on the floor on the passenger side (tanks need cleaning) put some spring time air in the tires, installed bubble wrap seat cushion, checked one more time for snakes under the seats and we were off! got ready to enter the main road and the foot valve got stuck; used emergency brake release tool aka ball peen hammer and we were going again, the truck suprisingly shifted well and the old flathead 402 brought the whole works (20'flatbed dump) up to a comfortable crusing speed of 50 mph wide open. I can tell I have caring people in my local community as I had at least 15 kind and patient citizens follow me home; I can tell they cared by the frantic waves and gestures indicating I was number 1 they gave me as I turned in the driveway! but the truck ran fine, made a bunch of racket with no exhaust and added excitement to an otherwise average saturday afternoon. God old trucks are fun!

Ross

Name: Mack B 421 (1963)

Date Added: 29 April 2011 - 08:09 AM

Owner: roscoe69

Short Description: 20' flatbed dump

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I can only imagine the lack of power out of this thing! I got it from my wifes boss, it's been sitting a few years but overall in good condition. It has a long frame with a 20' flatbed dump on it, the flathead is probably loaded carrying the truck around empty! Question; the shift pattern plate indicates a Mack 10 speed direct, do you split this trans or is it a 5 speed hi and lo?

Thanks,

Ross

Thanks for everything!! this will get me started anyway.

Ross

Thanks for the reply! Any idea what would be a good spark plug to try in it? it has RJ19YLM lawnmower plugs in it now.

Ross

Hello ! Does anyone know what is the proper spark plug for the 402 flathead? and any part number for points?

Thanks!

Ross

dang! I must have one of a kind!

Hello everyone, I've just acquired a B-421 with the 402 flathead in it and was wondering if anyone had some part numbers or where the best place to locate points and plugs for this engine. Info seems to be pretty scarce.

Thanks !!!

Ross

Thanks Man! I'll check it out!

Hi, It does have ENDT 673 stamped on it, but I can't really tell if there is a "C" on the end. Are there any other determining factors to determine the horsepower or vintage? it looks to have the original gray Mack paint.

Thanks, Ross

The numbers are stamped in the block, just ahead of the inj. pump, on that curved area right where the timing case cover bolts on, unless it was originally in a cabover truck, then the numbers could be on the rear of the block, just below the head gasket.

If it's a 250, the model numbers stamped in that area should be ENDT673C.

Thanks Man! I'll check it out!

Hi Everyone ! I bought 64' B61SX and was told the engine was a 250, it is a Mack engine and is turbo, it does look like a later model engine, has jakes, I can't find a plate or any simple indentification. The block casting # 239 GB5354 and are the only #'s I see. It does run strong and has a 13 sp od Roadranger behind it.

Thanks, Ross