well BACK then and again i say BACK then you did not have to WORRY about the gas as the reg gas at a gas station for the most part was 95 for reg. and if you were a young wild gear head your ride needed 105 or better like everything i owned . And i will tell ya'll once again back in the 60and into the mid seventy's high test was 105 or better and reg. gas was normally 95 so you ran Reg. in your tractor no problem . Now today it is a problem . You can not build and engine to factory spec. of the mid sixty's to run on the gas of today as you are NOT going to run a 10.5 to 1 compression ratio on the 93 even though it is the hightest of today . so your not going to get your old Mustang Nova road runner super bee to run like it did back then . Ya you can run your old M-450 on reg. is it doing all that it can Nope it ain't happing you may think so . stuff a set of 8500 ft. piston in one with a straight 450 gas head and a few other tweaks and see if ya can run Reg. But hey what do i know i have only been building engines for the last fifty two years .
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