05-04-2005, 06:13 PM
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6th Generation Texan
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Join Date: Feb 2002
Location: Devil's Backbone,RR 32,
TX
Cobra Make, Engine: Lone Star Classics #240,Candy Apple Red,Keith Craft 418w - 602 HP,584 TQ
Posts: 8,157
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Not Ranked
Diameter of Stock Pulleys ???
I'm trying to find out what the diameters are for stock pulleys for the water pump,crank and alternator.This is for a 351w,that is now a 418w.
Looking to figure out how much the factory overdrove the water pump and alternator.
While I had the 392w cooling was never a concern with the March performance pulleys.The Spal 16" fan and Griffin 2 row,1.25" tubes radiator did a fine job.
The radiator is rated for up to 600 hp.
I now have a 602 hp 418w and in slow traffic in 80's degree the water tempts go to 200 - 210*.
I have completely gone thru the cooling system and all is operating as they should.
I called Griffin and told the tech people the story. The first question they asked is "Are you running March pulleys ?".
They said that March performance pulleys were the #1 cause of low speed cooling problems when the radiator capacity is being pushed a little.
March perf. pulleys underdrive the pump 12 %.
I have ordered their Street Rod water pump pulley.It will overdrive the pump 5 % .
Any help with the diameters of stock pulleys would be appreciated.
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