I've got a stock '69 Chevy C-10 with original 250. Upgrades are HEI and soon to be Clifford intake, Clifford headers, and Holley 390. I've got jetting "start here" instructions from the Clifford guys, but didn't really get a sense on where to go with exhaust.
For logistics reasons, I need to run a single exhaust, so I plan to Y the pipes together soon after the header collectors. I anticipate this will also give me a "tri-y" effect and get me more midrange scavenging.
What I'd like to know is what size pipe should I use off the collector and what size should I run out the back. Truck is a "driver" (it doesn't carry or tow anything).
Experts... I await your golden words!
