Which runners are better? Can I port the stock runners to perform better. Are the 350 runners better than the 305 runners??

 

The cheaper the better. I'd look for some used ones that haven't been ported, $350 bucks is a terrible deal for runners. Most people go with TPIS or SLP. No. No.

 

when i say 350 or 305 runners i mean the stock 350 vs. the stock 305.they are different!!

 

There is no difference between stock 305 and 350 TPI runners, other than left side-to-right side differences. The '85-'88s (with cold start injector) are slightly different than the '89-'92s (no cold start injector).

You can clean up the entrances to each runner very slightly. There is not a whole lot there to work with.

jms

 

why dont they look the same? the 350 runners look like cast and the 305 runners look like tubular aluminum. (at least the runners on a vette look that way)

 

I believe the difference is called "wheel abrading".

Just a fancy way of saying GM spent 12 cents (or thereabouts) more on the 'Vette runners than the F-body version.

A couple of years back I sent my GTA tuned port to Street & Performance (in Arkansas) to be cleaned up and they sent it back with the "abraded" finish.

For what its worth---the F-body "non-abraded" versions polish easier.

jms

 

From what Ive read the Lingenfelter Accel superram plenum and runner setup is the way to go. According to the book I read it kicked *** on any other aftermarket big runners set. Im going to get one with a 58mm throttle body and 1 3/4" headers and 3" cat back (either flowmaster american thunder or HOoker with aerochamber). That should be a nice setup for my 91 350 formula. All I need is money.