Stop in for a cup of coffee

Rainy Day Auto said
good to know ....I didn't realize this.

A friend told me the hedders will add up to 30 hp ...not sure if that is true

My rule of thumb is generally 20 hp on a stock engine with average manifolds. On a 360 you might be looking at 25 hp over using the 318 manifolds.

That's for short tube headers like the Heddman. For long tube headers, add another 5-10 hp at peak rpm.