Dan Jaynes-Ukiah, CA put his Deep Freeze Poly SS-X manifold on last week, taking off his 7503 Weiand… He will be filing a complete report in the next couple days detailing suggestions on air cleaner, kickdown, throttle cable, water temp sending unit adapters etc type minor adjustments but he absolutely raved about the incredible increase in performance! He had a 600 Weber (early Edelbrock/late Carter AFB) that just smoked the tires in his 66 Coronet 500 compared to the Weiand… He said the top end needed to step up the jets and/or size of carburetor as it wanted so much more… It’s been a lot of work guys… Thanks for your encouragement along the way… Just got back from CA with 18 more manifolds and 38 valve covers and start shipping tomorrow… Orders now being taken for the next 50 manifolds to be reliably delivered for Feb/Mar installs…