Author Topic: What size Holley jets to use?  (Read 1961 times)

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jholmes217

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What size Holley jets to use?
« on: May 10, 2017, 10:30:57 AM »
A few days ago another member asked what size jets to use in the heads, and another member (Barry?) said it can depend on the rocker system and oil pump used.  I currently have my rockers off, so this is the perfect time to ask the forum.

My car is a street cruiser, with occasional "spirited" driving.  I have the POPs rockers system and stands, along with a POPs high volume oil pump.  Engine is a 428 Cobra Jet with stock heads and the pointy oil drain-back tins.  I currently have size 70 jets.  Should I stay with that, or go smaller or larger?
Jeff
1969 Mach 1 Q code 428 Cobra Jet
4 speed, 3:50 traction lock
Olympia WA. area

jayb

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Re: What size Holley jets to use?
« Reply #1 on: May 10, 2017, 11:12:33 AM »
I think #70 jets are fine, that's what I always use...
Jay Brown
- 1969 Mach 1, Drag Week 2005 Winner NA/BB, 511" FE (10.60s @ 129); Drag Week 2007 Runner-Up PA/BB, 490" Supercharged FE (9.35 @ 151)
- 1964 Ford Galaxie, Drag Week 2009 Winner Modified NA (9.50s @ 143), 585" SOHC
- 1969 Shelby Clone, Drag Week 2015 Winner Modified NA (Average 8.98 @ 149), 585" SOHC

   

jholmes217

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Re: What size Holley jets to use?
« Reply #2 on: May 10, 2017, 03:10:40 PM »
Thanks Jay! 
Jeff
1969 Mach 1 Q code 428 Cobra Jet
4 speed, 3:50 traction lock
Olympia WA. area