B Sharp,
As noted in earlier posts, Power Blocks were sold by TSC. They are not in the 1955 catalog, but are in the Fall '57 catalog, and appeared at least until their 1968 catalog (last one I have). They were sleeved (wet) blocks with o-rings to seal, and used spun-cast sleeves with aluminum pistons. The unit came complete with block w/sleeves, pistons, rings, piston pins, and lock rings. The original head, rods, carb, and ignition systems were retained, and JD gaskets were used. In addition, LP pistons with 8-1 compression ratio were available for all power blocks (and cost an extra $5/pair). The units came with a 1 year guarantee.They were available for the following tractors:
'41-'46 B, which also required a cold manifold available from TSC
'47-'52 B
'52-'56 50
Advertised horsepower 36 for the B, and 38 for the 50. On these the bore was increased to 5", and compression ratio to 6.7-1. 1963 cost was $109.50, with $10 trade-in allowance '41-'46 A, which also required a cold manifold available from TSC
'47-50 A
'50-'52 A, which also fit the '52-'56 60
Advertised horsepower 47 for the A and 53 for the 60. On these the bore was increased to 6", and compression ratio to 6.5-1. 1963 cost was $152, with $12.50 trade-in allowance Model G, s/n 13000 up. Separate kits for old style 4 1/2" flat head and the later 5 1/2" head. Both resulted in 6.4-1 compression ratio. Advertised horsepower 63. The bore was increased to 6 1/2", and the 1963 cost was $214.50, with $15.00 trade-in. Model 70 (gasoline). Bore increased to 6 1/2" and the compression ratio increased to 6.5-1. Advertised horsepower 59. 1963 cost same as for the G. I find it interesting that the G has more advertised horsepower than the 70.
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