Join Date: Jan 2015
Location: Injun Territory, 'Merica!
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 121 Post(s)
Good to read you found a replacement!
In an effort to provide accurate information, the late '63- '65 timing cover uses the same timing cover, has a timing mark that is shaped like a small diam cylinder that comes to a point. Pontiac V8's with this timing cover were originally equipped wuth an 8 bolt waterpump which has a cast impeller with a very "lazy" impeller design. This was due to the cooling system design/early radiators having inlet & outlet on the passenger side. Pontiac Engineering did not specify the later '66-68 more agressive style impeller in replacement waterpumps for the '63-65 V8's, as it moved the water through the radiator too quickly & heat was not exchanged as well.
Scott has it correct, the '66 & '67 took a different casting number timing cover & have a numbered "stob" to ck the timing. Many in the hobby don't know this, thus many '66 & 67 timing covers have been interchanged over the years through the course of cooling system maintaince.
Having pulled & sold literally hundreds of nice clean original Pontiac timing covers, it seems over the last two decades it's been harder & harder to find high quality used no rot late '63-65 style timing covers than any of the later 8 bolt timing covers. I try and keep in stock, nice clean examples of each, though seldom get in a nice late '63-65 cover. If anyone subscribed in the early to mid 80's to Dr Phil Baughman's "Classic GTO Newsletter", Phil had a GREAT technical breakdown nearly every month. One month's newsletter had a very well written breakfown of the different Pontiac V8 timing covers compete with pictures. Of all the subscription type Pontiac newsletters of the 80's & 90's, it was by far the best. In respect to original waterpumps, have another original wp rebuild session going next week & can work in a few more pumps. As always, each pump is correctly rebuilt & turnaround is fairly quick complete with email, PM, or texts, whatever is preferred line of communication.
Last edited by Pinion head; 01-26-2018 at 02:19 PM.