Thanks for the added info on the 409 and the tri- intake as I didn't know that the Chevy people only released the tri power on the 348. I remember a good mate of mine thought he had found a 409 advertised in the local paper for sale, ( this is before computers ), so he goes to have a look at the engine with his tools in tow and says to the guy he will buy it if he can remove a head and drop the sump to measure her first. The guy wasn't keen and reassured him that it was a 409 but Herbie stood his ground until the guy agreed, well it measured up to be a 348 so Herbie negotiated a much cheaper deal on the engine and I believe he still has the grin on his face from that. The engine went into a '64 Ponti Convertible with a blower and twin 4's on top.