Wow, Thanks everyone. Running a 3310 with one inch
Spacer. Seems to work fine. I ask an Edelbrock representative
At the fall nationals if there was a better preforming manifold
Than the LD 340. (Air gap) he kinda reluctantly said NO.
The RPM has better fuel delivery with better runners. Other fellas here called up Edelbrock and asked which was better and if it’s worth swapping the LD-340 out for a RPM.
The answer came back as NO.
I am unaware of any body here that has tried the swap and drag tested it or dyno tested it.