I've made 5+ of my own each time quite different in design to get a feel for what each change actually does as I could find any solid info on this after searching for hours and hours. (it's all a bit "black art")
Rough rule of the thumb
Shorter runners move the tq peak up
Longer runners...
HP has nothing to do with the belt's strength.
Valve Spring rate does though and I haven't had a single failure using std Gates belts with the Ferrea Dual springs running to 8300.
Having a new Idler and spring and running the Toyota covers plays a big part in this as the spring sets the...
My Crank shop here in Australia does custom billets (never priced one but I can ask during the week)
To save any embarrasement my Mom is long departed..
(she used to have no probs taking my 350sbc/th400 72 Monaro if it was in the driveway as all my cars are true streeters ;) )
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