lexoverrex

I have '83 c20 with 6.2 diesel '83 had early heads - fuel economy better than later - power lower.

Trivia: '83 6.2s with-the-Early-Heads got similar mileage. No governor but I suspect lower gearing - I have never taken mine over maybe 70mph, though it will go faster. Later 6.2s of that era different heads, more power, much less economy, I've read.