My 235 has the stock intake with Fenton headers. Some say that without the heat riser from the stock exhaust manifold the gas will not completely vaporize. The fuel air mixture from the carb. tends to cool the intake manifold and causes the fuel to unvaporize and leave unburned fuel , hurting low rpm throttle response and fuel economy. I've never noticed hesitation with my setup. My fuel economy could definitely stand improvement. BUT, would a inlet manifold heat plate like the one sold by Langdon's Stovebolt really help much?
