Post 11 is as-if someone watched me doing builds and took notes. 100% on.
I have kept a "Gold-Reserve" known-good valve-body in the event of a whacked-out valve-body is suspected.
Longk ago early ~1980s i tore down about 3 valve bodies 67-70 vintage and took notes. Well i missed that the 1-2 or 2-3 shift Red valves may have a series of 3 diameter changes which allows a fella to find interference-fit, in 1 whereas the other fits with no suspect (a bad deal to operate). Therefore thou shalt keep the VB and valves matched.
The notes show that nearly half the VB bore-valves have no Variation, whereas the rest have wholesale changes which become obvious and beg the question of what's better? Easy answer is 68+ is better than 65-67 if there is a choice to make. 65-67 being good and equally responsive to "Recipe" mods that keep the VB valving stock.
68+ VB must have been done for cost-reduction or/and grit reduction/mitigation.
TH400 VBs are a design-Production-operational success story in Fluid-powered state machines.
|