400 Connecting Rods

MH

Member
I have a 400 with a block casting # 35698DR2. I need to get a set of connecting rods for it, it currently has connecting rod 45750DAX in it. Are they interchangable with the 364920R11 Connecting rods? If not what is the difference, wrist pin size? other updates that I need to look for? It seems the 364920R11 are a fair amount cheaper than the 45750DAX rods.

(Engine has been apart and sitting for years and can only find 1 rod, no caps.)
 
Engine serial number break during 400 production divided your rods from the later ones also used on 450 engines. Small end of rod was smaller on later ones for use of a smaller piston pin bushing. They do make thicker bushings for your rod that lets you use pistons with small pins with your rods. Adapter bushings used to be higher than the small rod end bushing but I needed small end bushings for a C-175 engine this year and they really jumped the price. Have rods 45750, 10 each plus shipping if needed.
 
Ok, that is what I was thinking. It looks like the rod I have has an adapter bushing in it for the 1" wrist pin. Guess I need to figure out which kit to order and get the rods based on the wrist pins that will come with the kit.
 
If it's got the original block, the tractor serial number 31,329 and higher, had the small wrist pins,combined with the new camshaft 45955-DA, that was a 4.9 horsepower gain!
 
Fastfarmall where did that info come from. 400 were using the 45995DA or 48196DA camshaft from the beginning and resulted in around a 1.5 HP increase and the higher compression head change on gas engines resulted in rest of power change over than a SMTA from factory shipped. With the same compression and bore pistons the piston pin size had very little effect on HP. Small pin engines did seem to have less vibration. Also think you inverted some numbers on rod change.
 
I never talked about connecting rod number's, just serial number's. The 4.9 horsepower came from something official, i wrote it down years ago! So you think i got the serial number wrong? 31329 and later had the smaller wrist pins!
 
31239 should be it. Will check to be sure. Don't think Nebraska tests showed a 450 gas with 1/8 bigger bore than a 400 gas as built and tested before the serial as having the 4.9 power increase. Maybe a mistake on my part thinking you meant 400 after the connecting rod change had 4.9 more HP. Maybe a 400 with fire crater 4.125 pistons installed later resulted in a 4.9 HP increase could be what you noticed.
 
It was quite while ago i got that data from the Nebraska test, or IHC data but sure it was a later 400,but either way, i was around a 450 gas and it did seem a lot snappier than a 264's that i got so, would like to change one, a camshaft!
 

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