68 Base Camaro 355 Offy crossram Richmond Super Street close ratio 5 spd ivy gold 92K SoCal car
Well I learned something new, thanks guys. Never new the emissions carbs mixture screws worked that way. When I built my carbs recently I was studying all of Holley's vac secondary spring offerings and could not for the life of me understand WTH they ever bothered to even offer the black spring for. Now it makes sense, they never intended to ever fully open secondaries on black spring carbs, EVEN on a BBC.Oh, good grief. I took the carb off, got my throttle adjusted to show the the transfer slots correctly. Switched my vacuum advance to the manifold vacuum (it was on ported vacuum), got it all put back together and I was going to try retuning it tomorrow—now this monkey wrench. Other than the reversed mixture screws, does this make any difference to all the advice I've been absorbing? But thanks, it HAS to help knowing which carb I actually have.