Recently purchased a '64 Impala with 327/250hp version with "power pack" heads. looking for all the information I can find on theses heads. Have a pair of the 300hp double hump heads thrown in with the deal (need to go to the machine shop with those and I hear it can be kinda pricey$$$.
Recently purchased a '64 Impala with 327/250hp version with "power pack" heads. looking for all the information I can find on theses heads. Have a pair of the 300hp double hump heads thrown in with the deal (need to go to the machine shop with those and I hear it can be kinda pricey$$$.
man if you have those power pack heads hold on to them there great! made the mistake of selling a pair for way to cheap
Double humps will flow more, but power packs have a small chamber for higher compression. I think the later power packs had bigger valves.