mopar guys, i need a torque spec answer...

I'm working on a 413 mopar motor, and have been able to find all the torque specs for the motor regarding the cylinder heads except for the rocker shaft ***emblies.

Anyone know what the torque specs for them is?

Thanks in advance!!

 

50 pounds. remember to work inside out step by step.

 

awesome man, thanks. I figured it was around there, just wanted a partner in crime!

 

i release myself from all liabilty as far as leaks though i will take credit for the cool-aid smile from finaly getting back on the road.

 

I'm not sure if the later model truck 413's are different, but the 65 & under p***enger 413RB motors have torque specs of 30ft lbs. I would double check the year of your motor before going too far. The attcahment is from the 65 technical sevice manual.

 

Oh yeah, I also sneak up on the 30 ft lbs by tightening 10 ft lbs at a time in the correct sequence (10-20-30ft lbs). It takes a bit more time, but I think your tappets will like you for it.

 

It is NOT 50 ft-lbs. Do not even try that on those old motors with stock bolts. My Motors manual says 30 ft- lbs. My Chiltons does also.

Those old bolts are prone to breaking also - replace them with new grade 8 bolts, especially if you have stiffer valve springs. Its cheap insurance. I have broken them a few times and they are hell to get out.

I have broken them twice on vintage mopars before they got anywhere near torque spec.

 

the dodge manual for 64 list 50 lbs the dodge manual for 60 list 50 lbs. i ran 50 lbs on my 383 and my 413. do what you wish

 

sounds like you should check the year of your motor & heads before you go and do what you wish - the hydraulic lifters lash is set by the torque of your rocker shaft. noisy valvetrains ****.

http://www.fortunecity.com/silverstone/chrysler/45/bigblock.htm

There's quite a few different heads that will fit the 413 RB's and it may be a late model industrial (motorhome, etc) motor as well - which may have different torque specs - not sure since I've only had a 65 413. I would ask this ? over at the moparts.com forum once you've found out what you're working with. I have a few Mopar tech manuals around and could look it up depending on the year.

 

I've got 30 ft/lbs, and my engine is running pretty damn good.

Also, you may not be able to replace those bolts with standard Grade 8 hardware. If my memory serves me correctly, there is a certain collar around those bolts and changing them might lead to oiling issues

 

I just checked an extra set of rockers that I have in the ba*****t (from a set of 906's from a RB440 though - my ***umption is that they are the same or similar) and I think 57JoeFoMopar may be right - There's 2 different sizes - short bolt with short collar for the outsides and middle, long bolt w/ long collar for the 2 inboard ones. I suppose you could locate the right hardware, but I also think that as long as the rocker shafts have never been overtightened, you should be OK since I don't see 30ft lbs stretching the bolts/threads much. I would give the threads a good cleaning and inspection though.