So last year I ran 2 6109's with Allstate Carb billet plates on my TR. The Engine ran good although the plugs seemed to always "read" rich.
On the Dyno the engine made more power the bigger we went on the secondary jets.
It was dynoed around 575 HP at Appr. 5500 RPM. (It did have a lifter issue at the time. After replacing with Morrells and fixing that, it never went back on the dyno)
I ran it last year with 74's on the primary sides, 65 power valves, and 76's in the secondaries. (Max power on the dyno was with the 74's, 65 PV's, and 80's in the secondaries.)
The Holley sheet says that 6109's came with 75's and 76's with an 85 PV.
Ok, having said all that, I have bought 2 Holley main bodies new ( 134-300) Here Holley Carburetor Main Bodies 134-300S - SummitRacing.com
The base plates I have are actually sold by allstate as replacements for 4779 carbs, as are the new bodies.
So in effect, I now have a set of 4779 carbs with side hung floats.
My question is this.
What would be a good starting point for jet size and with or without the power valves?
Holley lists the sizes all over the map as far as 4779's go.
The new bodies came with 72's and 84's...which seem pretty drastic a difference between primary and secondaries?
The engine is 454 with just under 10:1 compression, Brodix 280 cc Rectangles, Comp Extreme Marine Hyd. roller (Here COMP Cams Xtreme Marine Camshafts 11-456-8 - SummitRacing.com )
Power valves sort of confuse me ...(Yeah, I'm a little slow sometimes!!)
Does the 65 power valve make the engine run richer than an 85 with the same vacuum?
any help or advice is appreciated greatly!
I am thinking the 65 PV's, with 74's primary, and maybe 78's secondary?
I know that the old bodies did have a loose booster that could have been dumping fuel and causing the rich plug readings. (which was part of my my reason for replacing the bodies)
I usually go off the Holley data sheet, but like I said, every 4779 is way different for jetting.