IIRC the magnum engines used a 90 degree hole pattern on the flex plates.

 

whats the raw casting mount on the side of the timing chain cover. thats not stock for a magnum.

 

This may help.
http://sittingfox.tripod.com/smallblkcompare.htm

 

Stock Magnum 360's were externally balanced. Don't know how they balance the crate motors. You will need to know that before you choose a balancer and flex plate.

 

i know the magnum uses less weight on the dampener than the LA version 360
bought my 6500rpm dampener from performance specialties.
i still would like to know what that mount on the chain cover is?

 

Hi Spun!

Im thinking that opening is for the LA heater bypass, the magnums use a small tube on the other side instead.

I just pulled the pistons and there Sealed Power H116CP stock bore. Im going to pull the crank and have the balance checked.

 

good idea! lee.
a boss on the timing chain cover- wouldnt that cycle oil and not antifreeze?

 

That looks like a mounting boss for a fuel pump. Didn't some early magnums have that with a block off plate bolted on?
:gr_patrio

 

thats the fuel pump mount on the timing chain cover,,,, to me it looks like LA block
on the side of the block should be cast number 318,,340,,340 ta ,,360 think same with the roller motors also then there some were should be stamped a serial number

 

Im pretty sure I got this shortblock figured out. It is part# P4876913 10:1 hyper pistons uses LA balance.

Thin Crank Vibration Damper -- Externally Balanced (1971-92 360, Short Blocks P4876906-08, P4876913)

I now need to figure out the flexplate balance, maybe I can get a new converter weighted for the 92 LA 360 and use 318 flexplate. Mopar sells a Performance Balance and Positioning Template Package for torque converters

 

if it is still availible the direct connection racing manual would have all the info you need
was our old school bible,,, and never loan it out ,, it will not come back

 

360' s are all externally balanced, as mentioned the weight size changes between The LA series and Magnum engines. The weight(s) on the converter moved to the flexplate starting in 96 along with the square mounting pattern to the converter. This was done so the same converter could be used on all engines and the flexplate would be bolted to the engine already making assembly of correct parts easier on the assembly line.