I tried Holley's tech line, but couldn't get any answers from them. I have several spare metering blocks for 600 cfm carbs. In Holley's tech manual they do not list part numbers for the 570 Street avenger metering block.
Jegs and Summit show aftermarket metering blocks for sale. I'm just concerned about the big difference in jet sizes between the 570 and the 600, and if the metering blocks are different. I run 68-70 primary jets with the 600 carb. Factory sizes on the 570 are 54 and 65.
When the power valve is installed tight with the gasket, I can fit a .025 feeler gauge between the PV and the gasket/block. Gas is definately getting through into the well and directly into the manifold.
I may try the 600 metering block on the 570 this weekend ( the PV fits tight on it ), and use the recommended 54 jets...
