mild rebuilt 440 with light weight pistons and thinner rings and one up from stock cam up and running in my 67 newport, was a 383-2 single 2" exhaust. just breaking in but has plenty of low and mid range power seems a little weak above 4800 rpms right now. will be interesting to see what the 2.5 dual will do, going to start putting the waldron on today. they made me 2.5 exhaust and 2.5 mufflers in and out and then 2.25 tail pipes coming out. stock would have been 2.25" mufflers in and out...
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