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Power Valve Tuning? |
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woodsman1953 
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Joined: Sep/16/2015 Location: Kent, Ohio Status: Offline Points: 126 |
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 Posted: Apr/14/2019 at 8:04pm |
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From what I understand, put vacuum gauge on the engine, see what vacuum is at idle. If say you have 14 in.of vacuum, then use a 7.5 power valve. Rule of thumb is half of the vacuum reading.
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turbo
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Joined: Oct/26/2008 Location: chicago area Status: Offline Points: 2568 |
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Posted: Apr/14/2019 at 10:16pm |
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Motorcraft is lean garbage
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they call me Capt RETIRED!
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mixed up
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Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2177 |
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Posted: Apr/14/2019 at 11:17pm |
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there are books put out how to tune a holly carb very good read it tells step by step on tuning carbs jetting and power valve secondary springs
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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ChillyB
AMC Nut
Joined: Nov/14/2018 Location: PA Status: Offline Points: 371 |
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Posted: Apr/15/2019 at 5:10am |
As a production carb used during early emissions days thats to be expected. And easy to solve.
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SC397
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Joined: Apr/30/2009 Location: Michigan Status: Offline Points: 5476 |
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Posted: Apr/15/2019 at 7:14am |
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I think you should go with a dorF Variable Venturi carb. Now there is one of fords better ideas.. LOL!
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304-dude
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Joined: Sep/29/2008 Location: Central Illinoi Status: Offline Points: 9082 |
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Posted: Apr/15/2019 at 7:46am |
My cousin had dual preditor carbs (variable venturi) on his tunnel ram... though they cost a bit and look too good to cover, let alone are pretty tall on their own. |
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71 Javelin SST body
390 69 crank, 70 block & heads NASCAR SB2 rods & pistons 78 Jeep TH400 w/ 2.76 Low 50/50 Ford-AMC Suspension 79 F150 rear & 8.8 axles Ford Racing 3.25 gears & 9" /w Detroit locker |
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ChillyB
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Joined: Nov/14/2018 Location: PA Status: Offline Points: 371 |
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Posted: Apr/15/2019 at 8:00am |
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Dont get the VV advantage for a drag car. Concept is solid for a street engine. Poor design execution can eclipse even the best theory, though. Mikuni nailed it for bike carbs.
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xfactor
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Joined: Sep/09/2012 Location: Port McNeill BC Status: Offline Points: 478 |
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Posted: Apr/15/2019 at 10:08pm |
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Just go to Holleys site on utube and look for power valve choices . They will tell you every thing you need to know
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Ray Harper 69 AMX 401
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turbo wrote: