Re: What do I need to change my 2 barrel to a 4 barrel

HLS@xxxxxxxxxx wrote:

"Steve" <no@xxxxxxxxxxx> wrote in message


But you don't NEED headers. A 4-bbl and dual exhaust (don't forget the
crossover!) are a nice mild wake-up for a 318. To take full advantage of
headers, you'd really need a bigger than stock cam and exhaust port
work. Headers won't HURT, but put your money elsewhere first.


Steve,
Wasn't there a 340 cid engine available about that time which was
essentially
the 318 punched out? Seems that I helped a friend swap a 340 in place of
his
318 in a Duster, but may be confused. I know for sure he installed a 4
barrel on it.


A 340 is indeed the basic 273/318 block with bore size increased, a forged crank, always with a 4-bbl, and DIFFERENT HEADS :-) The problem with doing a factory parts mix-and-match on a 318 is that putting either 340 or 360 heads on it (to get the bigger ports that flow better) also comes at the expense of getting a larger combustion chamber that would lower the compression ratio to about 7:1 without other added changes :-/ Best "bolt-on and go" heads for a 318 are the 80s "swirl-port" XXX302 casting with minor work to clean up the ports. Now if you start to change the bottom end and can pick pistons with a higher than factory deck height, then sure, use 360 heads and have the best of both worlds!

With all the modifications he eventually performed, this project evolved to
a
monster. He could lift the front wheels off the ground - seriously- in low
gear.

The 340 gets my vote as the best high-performance smallblock v8 ever. Screw the chevy 350, its good but it doesn't come CLOSE to a 340. A 340 will humiliate most big-blocks, and still leave the front end light enough to set up for handling as well. Sadly, they only built about 1 340 for maybe every 50 small Chevies ever made. And probably 1 340 for every 20 318s, for that matter.


.

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