The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Thompson power blast plate- Carb innovation?

tim_mc · 02-27-2020, 10:26 PM

No argument here. The blast plate atomizes the fuel better than the straight stream from the accelerator pump, and directs the fuel spray downward - would likely help Holleys too. Also regarding my Edelbrock 1405, I installed an old school Mr. Gasket 9710 regulator to keep the fuel pressure around 5psi. That really seemed to eliminate the extreme gas smell after a drive as I've read that the CarterAFB/Edelbrock carbs can't handle more than 5psi of fuel. I also changed the metering rods to the #1459 rods that are on the 1406 to lean out the cruising stage two steps, but keep it about the same on the power stage.
1405: 1428 (.100") main jets, 1451 (0.70" x .047") metering rods
1406: 1427 (.098") main jets, 1459 (0.75" x .047") metering rods

02-27-2020, 10:26 PM	#6
tim_mc Registered User Join Date: Jan 2019 Location: St Peters, MO Posts: 436	Re: Thompson power blast plate- Carb innovation? No argument here. The blast plate atomizes the fuel better than the straight stream from the accelerator pump, and directs the fuel spray downward - would likely help Holleys too. Also regarding my Edelbrock 1405, I installed an old school Mr. Gasket 9710 regulator to keep the fuel pressure around 5psi. That really seemed to eliminate the extreme gas smell after a drive as I've read that the CarterAFB/Edelbrock carbs can't handle more than 5psi of fuel. I also changed the metering rods to the #1459 rods that are on the 1406 to lean out the cruising stage two steps, but keep it about the same on the power stage. 1405: 1428 (.100") main jets, 1451 (0.70" x .047") metering rods 1406: 1427 (.098") main jets, 1459 (0.75" x .047") metering rods __________________ 1967 C20, 350 SBC w/Comp roller cam, 700R4 w/3.42 posi, PS, 4-wheel PDB, Old Air AC & GM Tilt column. Last edited by tim_mc; 02-27-2020 at 10:38 PM.