I'm getting very close to building the motor for my 69 FB. I want a Streetable but very powerful engine. I want all I can squeeze out of it within my parameters. The car will have a M-20 4 speed and a 3:55 posi. The motor will have iron #48 big valve D heads and a hydrolic roller camshaft, and most likely a stock intake. I plan on running factory style headers and keeping the compression where I can run pump premium gas.
Since I will be replacing the crank, rods, and pistons I can't see why not go to a 4.5" stroke? I understand doing this will require 4 bolt mains and a line bore. I am trying to determine the downside of the 4.5" stroke (excluding the cost issues). Appears more Cubes make more power with the same cam, idle better, make more torque sooner in the rpm range, and should be reliable if the rpms are kept under 6500 rpm. I've had both a 400 and 455 in the past, and with the exception of gas mileage, the 455 was better in every other way. So, seems like a 4.5 stroke with 500 cubes would make huge torque and power sooner than a 455. So, I read about so few 4.5 " street car strokers , there must be a reason most seem to go with a 462. What am I missing! Anyone running an engine stroked to 4.5" on the street. How does it do?
