Inliners International Forums Thread Like Summary - GMC 302 intake on 270 engine + carb choice?

Hi,

I want to switch intake on my 270 to one from a 302 to be able to install a brand new 2bbl holley 350cfm carb without the hassle of 2bbl-1bbl adaptor.

My question:
will the holley 2300 (350 cfm carb) bolt to the 302 intake (the intake has 4 mounting holes for the carb)

I understand that there might be a port size difference between my 270 head and the 302 intake, i believe Larrowe and Sons have "Port Ring Adaptors" readily available to solve this issue.

Any input would be appreciated, thanks

The 983 casting head has 1.94" intake and 1.500" exhaust valves. The 1-3/4" intake port opening that is always attached to these heads is kind of misleading, that is the OD of the counterbore for the port rings. The actual intake port runner size opening is more like 1-5/8".