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#1
09-11-2021, 11:06 AM
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Need standard crank pulley for ATI damper.
I am trying to find a 3 bolt crank pulley that fits a Pontiact ATI damper but is not an under drive pulley. I have a 2 grooves BBC pulley but that does not extend enough and I would need a spacer. Any suggestions appreciated.
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1971 GTO Convertible 455 #64 Heads, HO intake and carb with MSD HEI, RAIII exhaust manifolds and 3:55 posi |
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#2
09-11-2021, 11:43 AM
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Extend enough to match the water pump pulley, or line up with the other accessories?
More info needed, please. ps I have been running ATI Dampers (best made) for many years. The water pump pulley location is key, the rest can be shimmed. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#3
09-11-2021, 12:19 PM
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Quote:
I to have the ATI balancer. I agree best one made. I just took my previous 4 hole pulley and aligned it on the balancer and drilled 3 new holes. Has been fine. I had a custom spacer made for shimming my water pump pulley. I also installed a MSD crank trigger which caused me to shim everything forward. I believe Butler sells a 3 hole pulley that Ram air restoration sells or manufactures. One thing to watch is when you install the balancer, I had to clearance the timing cover a bit. |
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#4
09-11-2021, 01:33 PM
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Ram Air Restoration has factory aluminum pulleys they can drill for 3 holes . Before that I also had a stock one I drilled. I found a SBC ring(like the one on our balancers on the outside) and used it for a template.
And yes the timing cover will need clearancing.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#5
09-28-2021, 07:13 AM
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Quote:
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74  2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
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#6
09-28-2021, 08:03 AM
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I ended up drilling three new holes but due to proximity I had to use the allen head bolts and notch the washers. All good now and working well.
__________________
1971 GTO Convertible 455 #64 Heads, HO intake and carb with MSD HEI, RAIII exhaust manifolds and 3:55 posi |
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#7
09-28-2021, 09:40 AM
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Hi Darby: I had to remove material of the timing tab and a bit of the bottom tabs. I drilled a couple 6/32 blind holes and tapped them then had my son make me a custom pointer for TDC.
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#8
09-28-2021, 11:52 AM
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Quote:
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
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