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if you have a stock engine with decent flowing heads from the factory and then take the stock heads and mildly port them. then put them on the same stock engine will there be a HP gain and or will the peak TQ and HP move to a higher rpm.
my point was you need to have an additive in there. ford or gm ac-delco are better than the chrysler additive. do not use synthetic lube. what weight is the lucas ?
it was a 425 cubic inch nail head bored .038 thou over and stroked from a stock 3.64 stroke to a 3.75 stroke =446 cubic inch sound familiar lol. went from a 6.22 stock rod to a chevy 6.535 rod.
sold the car a few years back with a little more head work on different heads and a one size bigger cam 235-239 plus a few little other things never went back to dyno or track. maybe could have went to 12.2 et maybe on a good day.
it ran really good with those heads just wanted to get the .500 lift to 218-220 flow and .550 lift to 223-225. if it all it takes is to un shroud them. the numbers were really good to .400 lift then it seems they went bad.