austinsailor Posted June 20, 2018 Report Posted June 20, 2018 Still trying to figure out what this motor is. I believe it's a 413 but can't find it listed anywhere. It's in about a 55 wrecker, may or may not be original. Quote
wayfarer Posted June 20, 2018 Report Posted June 20, 2018 What makes you think it is a 413? Valve covers? color? Is It an RB? How about a block casting nunber? Photos? Quote
austinsailor Posted June 20, 2018 Author Report Posted June 20, 2018 Flathead 30" dodge molyblock. I'm 1500 miles away, so more details would be hard to get. I thought at the time the motor number would be sufficient, but it doesn't turn up anywhere. dual carbs, dual exhaust. don't know what an "Rb" is. Quote
Flatie46 Posted June 20, 2018 Report Posted June 20, 2018 Flathead 6, 413 truck engine, wow! That would be a score! Quote
Plymouthy Adams Posted June 20, 2018 Report Posted June 20, 2018 (edited) I believe the 377 and the 413 were basically the same block whereas the factory did a bore and stroke the get the larger cubes..similar to the 218/230 251/265 and about a dozen other mopar engines that right up to the current models are bore and stroke combos..you may have to do the storke deal...377 was 5 inch I think and the 413 was 5 5/16 this is not a very commonly discussed engine...data hard to find...even allpar does not go into many details on the larger powerplants Edited June 20, 2018 by Plymouthy Adams Quote
Dodgeb4ya Posted June 20, 2018 Report Posted June 20, 2018 As far as I know all the 413's used the SAE style bell housings ... but the timing plug in #6 is the only positive way to be sure of the 5-5/16" stroke. The twin carb intake manifolds are a bigger bore than the 377 and smaller Moly Block engine's too. They start out with a 1484... part# ..the smaller engines intakes start out with a 1112 part # as I recall. A pic of a typical up through 55 413 SAE bell housing.... 1 Quote
austinsailor Posted June 20, 2018 Author Report Posted June 20, 2018 The 413 block is a bit wider than the 331, although it's close enough you'd have to put a tape on it to tell. Not sure about a 377, never saw one to tell. when I saw this motor I thought it would be simple enough with the factory motor number, so I didn't check other details. I regret it now! not sure if it's stuck, so even if I was there checking the stroke might be a challenge. i asked here a few months ago and got no answer, was hoping someone new would see this and have some info. I suppose if I get serious enough I'll just have to make a trip. Quote
Frank Elder Posted June 21, 2018 Report Posted June 21, 2018 Isn't the 413 the only 6 with 12 ports? Or does the 377 have 6 intake and 6 exhaust also ??? Quote
austinsailor Posted June 21, 2018 Author Report Posted June 21, 2018 All the 30" motors had 12 ports. I have a couple 331 ci motors, 12 ports. 1 Quote
Dodgeb4ya Posted June 21, 2018 Report Posted June 21, 2018 8 hours ago, austinsailor said: "The 413 block is a bit wider than the 331, although it's close enough you'd have to put a tape on it to tell. Not sure about a 377, never saw one to tell." All the 30" Moly Block head widths are exactly the same including the 413...all measure nine inches"... 281, 306, 331,377 and 413's. I just measured a 377 head in a 1951 4 tonner to be sure. Same as a 413. Quote
Flatie46 Posted June 21, 2018 Report Posted June 21, 2018 What kinda torque does a 413 put out? Quote
austinsailor Posted June 21, 2018 Author Report Posted June 21, 2018 Brian has a selection of molyblocks in his yard, including the 413 industrial in his truck he uses regularly. When he replaced the original 331 many years ago he found his starter pedal rubbed the block because it was wider. He and I measured several motors and found his industrial 413 was a bit wider, I think about 1/4". Head bolt to head bolt, where we measured them, were not the same. Quote
Dodgeb4ya Posted June 21, 2018 Report Posted June 21, 2018 (edited) Not to start an argument here Gene...Please don't kick me in the arse for this!? I just pulled out all the different 30" head gaskets for all sizes of these engines and I did learn that the 281 CI engine head gasket is 1/4" narrower than all the other larger bore head gaskets. Head stud holes are off by 1/4" along drivers side of block too. I did measure head widths on a 306/377/ and a 413 industrial engine.Both Gaskets and head widths are exactly nine inches. All cooling and head stud holes align properly. The blocks in all my B-series 1951 to 53 big trucks all all have the same recess in the block for the starter to fit back into. I don't have a 281 engine so don't know on that engine. 1941-47 engines could be cast different... I don't know There are several different head gaskets because of bore size differences. Anyway 413's have bigger rod journals, hydraulic lifters ( 377's too) on the truck engines, industrial engines use solid lifters with valve rotators, and different cams of course...there are some other unique things about the 413's but I am forgetting those... Stroke and bore is the only positive way to be sure of a certain displacement. 413 Head # is1483668 Block # 1320629 Edited June 21, 2018 by Dodgeb4ya Quote
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