Originally posted by junkyardjeff
I remember now reading in hotrod or another magazine that one way reduce the octane requirement of a higher compression motor is to add a EGR valve,I have a 66 390 and a 65 352 that both have around 10 to 1 compression and I would like to try adding a EGR valve before changing heads. Did ford make a 4 bbl intake or did or still do the aftermarket make 4 bbl intakes for EGR equipped FE motors,could a older intake be drilled so that a EGR carb spacer be used?,changing a intake is a lot easier then changing the heads. Jeff

i wonted to post on this so i will see the answer to this?. i cant see how a egr valve could chang the octane reqirements of the motor, and its more to a egr system than just bolting it on, but i learn something new every day, so mabey it can.