jet recomendations

[terry]

hi folks, thought i'd get your 2 cents worth on jet sizing
holley 750 cfm vacume secondaries,dual feed single pump currently 72's all four corners.
car is 68 barracuda 360/380 crate engine,4 speed,4:10 rear.3350 lbs., 18 degrees intial and 34 at 3150 rpm. msd 6al box and plugs gapper at 45. elevation is about 500 feet here in southern ca.
hope this is enough input
thanks
terry

 

[388dart]

70/78 would be where I would start - power valve equals 8 higher for the secondaries.

 

[terry]

hi folks in my earlier post i questioned jet sizes. well now that i have removed my front fuel bowl and changed the 2 primary jets and on the the rear bowl removal i see i have no jets. i have no metering block there.just a metering body. is this normal? 750 cfm vacumme seconday dual feed.
thanks
terry

 

[70aarcuda]

you have a metering plate in the rear if you dont have a metering block that contains jets..

there is a number on the plate that you can look up on the holley web site and get what jet size it represents...

you can buy a kit and replace the metering plate with a metering plate that allows jet changes...