When I bought my ‘66 it came with a tired 302. Upgraded the 302 to a roller 5.0L. Meanwhile, I have been randomly looking for a correct-for-the-car 289. Found a "core" short block with date codes that match my car’s build date. In its 50+ years it has, at least once, visited the machine shop. It’s been bored and had some head work.
My question has to do with the heads. They are C6OE with 1.84” intake valves. Exhaust remains stock at 1.45". The runners have not been ported. The chambers look unmodified. Assuming the only mods are larger intake valves, will there be any noticeable performance increase over the stock 1.67” valves?
My question has to do with the heads. They are C6OE with 1.84” intake valves. Exhaust remains stock at 1.45". The runners have not been ported. The chambers look unmodified. Assuming the only mods are larger intake valves, will there be any noticeable performance increase over the stock 1.67” valves?