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can anyone tell me the difference between intake 4452891 and 4452893. in hp books "how to hotrod the small block mopar" they show the 4452891 in one of their recomendations and i see a 4452893 for sale somewhere, but that number is not listed in the book under mopar manifolds. im thinking the...

I have a set of heads casting number 4448308 which I assume are the "308" heads. Anybody have any input on these heads good or bad as far as performance. I know they are not 202 valves ect. but I have heard that they are a good head...?