8 bolt vs 11 bolt water pump?
I have only worked with the 11 bolt pump, clearancing the plate, etc... are there any differences to be aware of with the 8 bolt pump? Next step is to remove pump and checkout out.
Helping a friend with his new 389 /66 gto running warm at 70mph highway speeds.
About the only thing we have not tested/tried is to check plate clearance with the cast iron flow cooler pump and trying the smaller pump pulley.
I would have to think the engine turning 3k rpm will be spinning the pump plenty fast, thus negating any benefit from the smaller pulley...?
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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