A
Anonymous
Guest
Not being a carb. guy, I took my '74 F-100 with a recently installed 300cid down to the Carb. shop to have it tuned to perfection. After slapping down the bucks for a diagnostic check, they determined it was running a bit lean and adjusted it accordingly. They ended up adjusting it out as best they could and determined that what it really needed was a different power valve. They didn't have time to complete the repair today as they did not have the correct power valve for my application.
But it is just as well, because despite my limited knowledge of carburetors, I DO know that Ford specifically installed 2-stage power valves on the Pickup Trucks because of the differing levels of load occurring when a truck is full or towing and when they are empty. However, the mechanic said he was installing a SINGLE-stage power valve on my truck, saying that the 2-stage power valves are not needed on the smaller engines (like my 300).
He was going to put a single "8.5" power valve on my Holley 600 because my engine pulls 19.5kg of vacuum at the manifold.
QUESTION: Should I take the advice of a Pro Carburetor guy in regards to this single-stage power valve in a TRUCK application, or should I have someone else install a 2-stage power valve in the carb?
Fresh 300cid, Holley 600 with Adjust-a-jet, K&N filter, Offenhauser intake manifold, RV Comp-cam, Melling HD Oil pump, Mallory Unilite Distributor, Accell Super Coil & wires, Ceramic Coated EFI exhaust manifolds, Custom Y-pipe and 2.5" exhaust w/ Dynomax muff.
But it is just as well, because despite my limited knowledge of carburetors, I DO know that Ford specifically installed 2-stage power valves on the Pickup Trucks because of the differing levels of load occurring when a truck is full or towing and when they are empty. However, the mechanic said he was installing a SINGLE-stage power valve on my truck, saying that the 2-stage power valves are not needed on the smaller engines (like my 300).
He was going to put a single "8.5" power valve on my Holley 600 because my engine pulls 19.5kg of vacuum at the manifold.
QUESTION: Should I take the advice of a Pro Carburetor guy in regards to this single-stage power valve in a TRUCK application, or should I have someone else install a 2-stage power valve in the carb?
Fresh 300cid, Holley 600 with Adjust-a-jet, K&N filter, Offenhauser intake manifold, RV Comp-cam, Melling HD Oil pump, Mallory Unilite Distributor, Accell Super Coil & wires, Ceramic Coated EFI exhaust manifolds, Custom Y-pipe and 2.5" exhaust w/ Dynomax muff.
