520 casting Power Pack heads| Grassroots Motorsports forum |

DCharger68 Reader
5/11/14 3:57 p.m.

I just bought a 283 with Power Pack heads a little bit ago. Does anyone have any idea how these heads flow? I'd love a flow chart if anyone has one.

wheels777 Dork
5/11/14 6:49 p.m.

DCharger68 wrote: I just bought a 283 with Power Pack heads a little bit ago. Does anyone have any idea how these heads flow? I'd love a flow chart if anyone has one.

IIRC, there are two sets of 520. The ones that are like the 896 are not worth anything. The better 520 can be made to work well on a small bore engine. What are you building?

DCharger68 Reader
5/11/14 9:29 p.m.

wheels777 wrote:
DCharger68 wrote: I just bought a 283 with Power Pack heads a little bit ago. Does anyone have any idea how these heads flow? I'd love a flow chart if anyone has one.
IIRC, there are two sets of 520. The ones that are like the 896 are not worth anything. The better 520 can be made to work well on a small bore engine. What are you building?

They're going on a 307 for the time being. But if the 283 block they're on is worth a damn, they may go back on it eventually. They're casting number 3884520 heads if that helps anything.