500 vs 600

Is it an AVS eddie?

That would sell me on it. I run a 650 eddie avs thunder series on my 318. It's a stock cop car engine with 7.5:1,a small isky cam and 360 heads. The factory installed 800 cfm tq carbs on these and believe it or not the stock tq outperforms the tuned eddie by a wide margin. Secret is the tunable air valve secondary. Motor will only use it when it's needed.