check this for your split top's 27-841234.........the 500 EFI is a standard bolt pattern

27-841234: Search Result | eBay

damn. Quick response. U always were a mound of knowledge I remember u answering a ton of questions back when I had my old magnum. Thanks again.

Non relevant question but what magnum did you have - 27’? Damm I loved that haul. Cuts the waves like BOSS!

Exh gasket recommended for Edelbrock/GM 315cc aluminum head

Stainless marine sells a gawd awfully expensive jig /template to help. $750 i think. Doh !

Those header flanges are a pita to drill ask me how I know........

Probably easier to drill and tap the heads to the conventional bolt pattern

Enquiring minds want to know

I drill out 2 pair of CMI sweepers to fit the AFR heads.......................... the flange is hardened stainless

Dont fuk up those headers to fit those outdated heads. Buy brodix 298 RR or AFR 300 heads, run an edelbrock dual plane. Should make lots of torque and more power than a normal 525.

Not sure on the Brodix, but you cannot find a set of BB AFR heads for like 12 weeks. (maybe you can get the Enforcer heads, but the magnums are unobtainable).