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Author
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Topic: Size jets for 289 with 650 Holley DP
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662+2
Gearhead Posts: 124
From: Ontario, Canada
Registered: Jan 2003
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posted 09-12-2003 10:55 AM
   
I am guessing that my car has about 280-300 hp I am currently running 13.3 @ 102 mph I have taken the Power valves out and installed plugs then I installed 72 jets square do you think I should jet up?
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70coupe
Gearhead Posts: 459
From: Toronto,Ontario,Canada
Registered: Aug 2000
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posted 09-12-2003 09:59 PM
No,your plugs tell the tale they're rich!
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662+2
Gearhead Posts: 124
From: Ontario, Canada
Registered: Jan 2003
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posted 09-15-2003 10:33 AM
I have never checked the plugs right after a race or TT so I wouldn't know about the plug colour
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Tbird
Gearhead Posts: 298
From: USA
Registered: May 2003
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posted 09-15-2003 11:04 AM
http://www.strappe.com/plugs.html
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 09-15-2003 11:05 AM
Try 75's square and see if it picks up e.t./mph. If it helps then go up to 78's, etc., etc....until 60' or mph start to suffer, then go back to last jetting and try changing one set at a time for finetuning.------------------
1966 Mustang Coupe: Custom glass hood and BIG scoop sits atop a 289 stroked to 331 c.i., Steel crank and girdle, 5.4 H-beams, Forged slugs, TFS alum. heads, ported Stealth 8020 intake, Xtreme 274 Solid Roller, Holley 750 HP, long tubes, 4speed, 9" 3.50 posi.
11.86 @ 116 mph (7.62 @ 93 mph)full street trim!
DanH
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662+2
Gearhead Posts: 124
From: Ontario, Canada
Registered: Jan 2003
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posted 09-19-2003 07:18 AM
Thanks for the advice I will try a few things this Sunday 
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