CLASS RACER FORUM - View Single Post - 1957 283/270hp dual quads drag testing on a 350

Dragsinger · 09-04-2009, 11:45 AM

while testing, another option is to completely remove the metering rods and change jets to allow the correct mixture.

This is common with Q-Jet racers. [it is called "no rod jetting"] You remove the rods, remove the power piston spring, then reinstall the power piston in it's original location.

Danny Ashley has a formula that will calculate the need jet size. From memory, I "think" the primary jets will need to be about 7 - 8 numbers smaller. Another source of info is Oliver Race Carbs in Arkansas. Both of those builders have extensive experience with all the Rochester and Carter combinations.

09-04-2009, 11:45 AM	#8
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: 1957 283/270hp dual quads drag testing on a 350 while testing, another option is to completely remove the metering rods and change jets to allow the correct mixture. This is common with Q-Jet racers. [it is called "no rod jetting"] You remove the rods, remove the power piston spring, then reinstall the power piston in it's original location. Danny Ashley has a formula that will calculate the need jet size. From memory, I "think" the primary jets will need to be about 7 - 8 numbers smaller. Another source of info is Oliver Race Carbs in Arkansas. Both of those builders have extensive experience with all the Rochester and Carter combinations. __________________ Larry Woodfin 471W