Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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Two ways to solve this & retain a '60's Pontiac V8 accessory look under the hood.
1) Run all '65 accessorys. a '65 8 bolt timing cover & 8 bolt pump, correct '65 WP & crank pulleys & '65-66 PS pump.
If car has manual strg, the '64-67 single groove WP pulley is the same. correct '65-66 manual strg crank pulleys are a little harder to find, but can be sourced. I have a pallet rack section devoted to Pontiac V8 pulleys, PS pumps, accessory brackets & understand which pulleys & PS pumps line up, & which wont't
2) 11 bolt Conversion set-up. I've been putting these together since the early 90's, have put together multiple dozens of changeovers. This conversion allows use of the later 11 bolt timing cover & one piece '68+ damper (these were used originally on your 455). The PS version of this conversion incorporates a '67-70 PS pump, alum mtg bracket, & PS pulley, along with the correct WP pulley & correct crank pulley to line up. This set-up uses the tall 11 bolt WP & '69 alt straps. For those with '65 or '66 Tripowers, I've previously had correct strap style alt brackets cut out, locally, with a water jet.