Whipple Pulley 4.250" 6 Rib Does It Clear the Gen5 3.0L on 15-17 GT

[ALLKHEINZ]

im trying to determine if a 6 rib 4.250 pulley will fit on my gen5 3.0l 17gt. probably not done much or ever but i cannot see anything bigger then a 4.00' in the install guides boost chart on last page of my kits instructions, i googled and weir racing shows it and whipples own site actually offers that specific 4.250 6 rib in 4 bolt t.....dont want to drop the $140+ on the pulley only to find out there isnt enough clearance on my application for that size

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[engineermike]

Curious why you are wanting the 4.25” pulley.

 

[ALLKHEINZ]

car has a 10rib setup, its currently tuned for only e85 and i have a 20% lower, ive run it with a 3.5 pulley and it makes 18.36lbs….my area its hard to get e85 so inwanna run pump gas, the shop i deal with suggested just for street use and light dury try a 6 rib because they also saw both a 4.125 and 4.250 showing available…..plan is tonreduce the boost substantially enough to safely run 93 pump gas….whipples boost chart shows 15lbs with a 4.00 and 20% combo so a 4.250 would droo it to 13lbs and i should be ok to run a low timing conservative 93 tune for getting around and the odd single gesr pull.

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