Author Topic: Secondary metering rod suggestion  (Read 2157 times)

Offline Zac Agee

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Secondary metering rod suggestion
« on: February 25, 2014, 07:21:13 PM »
So here is what I got. A 84 chevy 3/4 ton 4x4 on 35 inch tall tires (upgrading to 37s soon) with 4:10 gears and a 4 speed. The engine is a 454 bored .060 fully balanced with a pair or iron 98cc large oval port heads that have been fully ported and polished and some un shrouding around the exhaust valves and larger exhaust valves then stock compression is 9.7:1  cam is a lunati voodo hydraulic flat tappet cam 112 lobe separation advertised duration is 262(intake) 268(exhaust) lift is .530(intake) and .542(exhaust). I got the primary circuit running great and decent mileage about 14mpgs but the secondary's seem lean at WOT when they first come on about 2700rpms the power doesn't seem to be there as much gets better around 3500rpms but not as strong as it should be and after looking at my thermal coated headers after a good WOT run they started to turn white on all 8 tubes and the plugs are paper white that tells me with the lack of power it's probly lean on the secondary's. Plus when I add the new tires gonna be worse.
Ok carb is a 17058212 rebuilt to cliffs specs he gave me with his kit and DA secondary metering rods and a J hanger
Would like a suggestion on a pair of metering rods to start tuning with

Offline Cliff Ruggles

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Re: Secondary metering rod suggestion
« Reply #1 on: February 26, 2014, 05:04:55 AM »
Those metering rods should be plenty of fuel at WOT for what you are doing, based on that carb number.  Even with that said, in any and all cases, I'd tune for best WOT power even if you have to get smaller on the metering rods.

I can custom machine a set to whatever size you want to try. 

I'd also make sure that you don't have a fuel delivery issue causing the engine to lean out (low fuel level at full throttle) instead of the metering rods not letting enough fuel to the engine......Cliff