67 Big Block water pump

[Philip C.]

Hi guys, got a call and I cant find in 67 JG maybe someone could help, on the back of the water pump is the rear plate held on with slotted pan head screws or 1/4 20 hex bolts? cant remember Thanks (this car is built in June 67 and a 435) Phil 8063

[Ridge K.]

Re: 67 Big Block water pump

Hi guys, got a call and I cant find in 67 JG maybe someone could help, on the back of the water pump is the rear plate held on with slotted pan head screws or 1/4 20 hex bolts? cant remember Thanks (this car is built in June 67 and a 435) Phil 8063

Phil, one of the very few original parts missing off my '67 bigblock car (built early April 1967) is it's original water pump, but I have examined many, many casting # 3856284 originals and they all had 1/4 hex head bolts on the rear cover.
Ridge.

[Wayne M.]

Re: 67 Big Block water pump

..... but I have examined many, many casting # 3856284 originals and they all had 1/4 hex head bolts on the rear cover.
Ridge.

Ridge, Phil -- not attempting to highjack the 1967 flavor of this thread, but here's the back of a '284' cast E_5_5. Plate is thick and perfectly flat. Pan head screws with star washers underneath. The '65 TIM&JG says the "[BB] pump backing plate is stamped metal held in place by pan-head screws". Soliciting opinions on what "stamped" means -- I think of "formed", ie. with an outer raised lip and a depressed "ring" about 4" dia., like an rebuilt early '66 unit I have.

Do the '66 and '67 manuals call for a back plate (and attaching bolts) that are different than that described for '65?

[Joe L.]

Re: 67 Big Block water pump

Hi guys, got a call and I cant find in 67 JG maybe someone could help, on the back of the water pump is the rear plate held on with slotted pan head screws or 1/4 20 hex bolts? cant remember Thanks (this car is built in June 67 and a 435) Phil 8063

Phil------


Attached are photos of an NOS big block waterpump with a date of July, 1966. You will note that it has the pan head, slotted screws with the lipped backing plate. However, I believe that the screw style changed to hex sometime in 1967.

[Philip C.]

Re: 67 Big Block water pump

Thanks guys for the info so far, I checked my two 67s ,the one built Fed. has the pan screws and my april car has the 1/4 hex bolts. So if my cars are correct (both restored) Joes guess about change over, flyes. Anybody else Thanks Phil 8063

[Ridge K.]

Re: 67 Big Block water pump

Joe L. is right about 99.9% of the time.
I also own a 45,000 mile 1966 Chevelle SS396, that still has it's original water pump. Car was built April 1966 at the Fremont, California assembly plant. That pump has the flat back plate, and pan screws. Pump dated 12/65.

Wayne's input and photo also was helpful and follows the majority of input I have gotten on 1965 bigblock pumps.
The only in question in my mind about the 1967 bigblock water pumps is ....... when did the change over occur (enbossed rear cover, and 1/4 hex bolts).
I'm hoping you get more comments/opinions from 1967 owners...
Ridge