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#21
06-09-2009, 02:11 PM
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Am I measuring right? My pulley crank is 8" (part# 4810381B) but the water pump pulley size is 6.5" (part# 481040XT) O.D. and these are on my 68 GTO. They're stock, as far as I know. I'll measure the pulleys on my LeMans and Firebird when I get home tonight.
GTOJOE - that's a nice 67 RA you've got, I still drool over that article in HPP! PS - what does Nunzi charge for that thermostat, and would the Hi-Flow Robertshaw suffice?
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The Firebird, GTO & LeMans are gone...the garage is now occupied by 2005 Porsche 997 C2S and more guitars in the house... |
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#22
06-09-2009, 03:40 PM
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67BlackCherry,
The Thermostat was thrown in with the pulley for my test.....I don't know the cost and am not sure if Nunzi will be putting this together as a set....I would contact him. Thanks for the nice comments pal...
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1966 GTO Conv't, 4-speed, Tri-Power(sold) 1967 GTO Ram Air, PHS Doc. 4sp, #'s match, 15+ options 1 of 751 (Featured on Cover plus 6 page spread in May 2006 HPP) 1970 GTO Judge, PHS Doc. 4sp, #'s match, Ram Air III 2006 GTO Spice Red. M6,18" wheels, 400 HP LS2 richmondcountypontiac.com Need High Quality Printing fast and reasonable? www.farbetterprinting.com Since 1974 Quotes at: sales@farbetterprinting.com |
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#23
06-09-2009, 08:02 PM
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Quote:
 all over that car! Any idea how many of those original RA cars have been found?
__________________
The Firebird, GTO & LeMans are gone...the garage is now occupied by 2005 Porsche 997 C2S and more guitars in the house... |
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#24
06-10-2009, 03:04 AM
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Quote:
At the moment we have located at least 15......
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1966 GTO Conv't, 4-speed, Tri-Power(sold) 1967 GTO Ram Air, PHS Doc. 4sp, #'s match, 15+ options 1 of 751 (Featured on Cover plus 6 page spread in May 2006 HPP) 1970 GTO Judge, PHS Doc. 4sp, #'s match, Ram Air III 2006 GTO Spice Red. M6,18" wheels, 400 HP LS2 richmondcountypontiac.com Need High Quality Printing fast and reasonable? www.farbetterprinting.com Since 1974 Quotes at: sales@farbetterprinting.com |
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#25
06-10-2009, 09:27 AM
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Quote:
The pulley on my LeMans (455) is 6.5" and Firebird (400) is 7" - what now? With a smaller pulley, won't the pump move antifreeze through the radiator too fast?
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The Firebird, GTO & LeMans are gone...the garage is now occupied by 2005 Porsche 997 C2S and more guitars in the house... |
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#26
06-10-2009, 01:03 PM
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As I said before, Nunzi worked out these bugs so he would be the one to talk to. I have experienced no problems so far....
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1966 GTO Conv't, 4-speed, Tri-Power(sold) 1967 GTO Ram Air, PHS Doc. 4sp, #'s match, 15+ options 1 of 751 (Featured on Cover plus 6 page spread in May 2006 HPP) 1970 GTO Judge, PHS Doc. 4sp, #'s match, Ram Air III 2006 GTO Spice Red. M6,18" wheels, 400 HP LS2 richmondcountypontiac.com Need High Quality Printing fast and reasonable? www.farbetterprinting.com Since 1974 Quotes at: sales@farbetterprinting.com |
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#27
06-10-2009, 08:59 PM
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Cherry- divide crank pulley dia by water pump dia to determine amount of overdrive. Compare that to the ratios listed by B-man and GTOJOE to see where you fall.
I'm still wondering at what RPM do the water pump bearings give up?
__________________
I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#28
06-10-2009, 10:15 PM
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Quote:
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The Firebird, GTO & LeMans are gone...the garage is now occupied by 2005 Porsche 997 C2S and more guitars in the house... |
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#29
06-11-2009, 09:09 PM
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LOL...
Since I can't afford 200 bones for a pulley, can somebody tell me what factory pulleys (numbers and sizes) to use with a '68 timing cover to overdrive the water pump???
__________________
I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#30
06-16-2009, 02:30 AM
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My testing reinforces what b-man stated. I ran about a half dozen pulley configerations, and the faster I turned the water pump shaft the better the cooling. Pontiac picked an 8" crank pulley and a 6.5" water pump pulley on their A/C cars -- and I'm sure it was because their testing said this was best.
Only thing I didn't try was the 8" bottom with the 5.5" top because the resulting math results were a little scary (about a 146% overdrive would have the water pump spinning over 8,700 RPM at a 6,000 RPM shift point).
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress. |
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#31
06-16-2009, 10:41 AM
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"the faster I turned the water pump shaft the better the cooling. "
More evidence that the idea of "keeping the coolant in the radiator longer" is a myth. George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum |
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#32
06-16-2009, 11:05 AM
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I just spoke to Nunzi and he says that pulley is for 64-68 Pontiac V-8s and he has no plans to make one for 69 and up motors. I would think someone out there could make a 5.5-inch pulley.
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#33
06-21-2009, 10:40 PM
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Still running cool.....no problems yet......Whether I hid the problem or not...it's the first time in 4 years that the temps are stable....I now can enjoy cruising..
Joe
__________________
1966 GTO Conv't, 4-speed, Tri-Power(sold) 1967 GTO Ram Air, PHS Doc. 4sp, #'s match, 15+ options 1 of 751 (Featured on Cover plus 6 page spread in May 2006 HPP) 1970 GTO Judge, PHS Doc. 4sp, #'s match, Ram Air III 2006 GTO Spice Red. M6,18" wheels, 400 HP LS2 richmondcountypontiac.com Need High Quality Printing fast and reasonable? www.farbetterprinting.com Since 1974 Quotes at: sales@farbetterprinting.com |
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#34
06-24-2009, 02:13 PM
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Are the 8" and 6.5" pulleys available? The chances of finding them in a recycle yard is nil. My stock '76 pulleys are 7.25" crank and 8" WP. If I could find a 6.5" waterpump pulley I'd be happier than with my current setup but getting an 8" crank pulley to go with it would be great.
Even if Nunzi was going to do a pulley for later engines the price is too steep for me. Stewart
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1976 TA, nose converted to 1970 style, 406, ported #13 Heads, '70 iron intake without crossovers, Q-Jet - Cliff style, RARE OS manifolds, Pypes duals w/crossflow, UD 230/238 custom HR 4/7 swap cam with solid roller lifters  , Hydro-Boost 4-wheel discs, 4 Speed, 3.23 posi.“Nothing in life is so exhilarating as to be shot at without result.” - Winston Churchill |
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#35
06-24-2009, 02:27 PM
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Stewart, chevy makes a 6.5 it looks like it might fit, not sure if my friend will let me have his.
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Conrad 79 Trans AM 406 #12 heads Torker II intake Crower 60210 750 holley vac. sec. T400 3500 Stall 3:73:1 rear.  ECMTTFMFers. IHTTFMFers.
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#36
06-24-2009, 03:02 PM
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Quote:
Summit Part # 13032 / that's a March Pulley, 6 1/8" for a later engine, $95.00. You're welcome. 
__________________
The Firebird, GTO & LeMans are gone...the garage is now occupied by 2005 Porsche 997 C2S and more guitars in the house... |
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#37
06-24-2009, 03:34 PM
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You think it's worth going from a 6.5" pulley to a 6 1/8" pulley?
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#38
06-24-2009, 04:32 PM
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Quote:
JMO, Stewart
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1976 TA, nose converted to 1970 style, 406, ported #13 Heads, '70 iron intake without crossovers, Q-Jet - Cliff style, RARE OS manifolds, Pypes duals w/crossflow, UD 230/238 custom HR 4/7 swap cam with solid roller lifters , Hydro-Boost 4-wheel discs, 4 Speed, 3.23 posi.“Nothing in life is so exhilarating as to be shot at without result.” - Winston Churchill |
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#39
06-24-2009, 04:37 PM
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Quote:
__________________
The Firebird, GTO & LeMans are gone...the garage is now occupied by 2005 Porsche 997 C2S and more guitars in the house... |
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#40
06-24-2009, 04:46 PM
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Easiest way to increase cooling is to use a crk and w/p plly from an a/c car.
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If you cant drive from gas pump to gas pump across the map, its not a street car. http://s207.photobucket.com/albums/b...hop/?start=100 |
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