Oops, I stand corrected. Maybe thats why I didnt buy those bare W2's for $300 15 years ago...no, it was because i just didnt have it!econo still need the offset intake rockers....and depends on what econo head you have...standard or long valve heads....several versions were made..
long stem valves are drilled for a larger bolt in the pedestals...
standard LA headers fit w2 heads like ****...LOL
old w2 heads are open chamber-no quench. some newer w2 heads are closed chamber-quench is good. I see w2 closed chamber heads flowing 260 @ .600", ported 310 @ .600. Ed perf. rpm heads, with quench, flowing 250, 300 ported with 2.08" valves. according to the formula from air flow research, that extra flow is good for about 15 more horse, then factor in quench
guess again yellow, the above deck number for a 1968-71 340 is .018=3.31 stroke, 6.123" rod, 1.840" piston and a 9.600" block. add a .017" gasket (good luck finding 1 at a decent price) and wow, the piston is up .001". sure we can deck the block and go custom pistons, but the average mopar open chamber area for quench is recessed .085". my point is the edelbrock heads flow very close to the w2, and getting a closed chamber head to flow more by enlarging the chamber to the bore size is simple. I run 11.5:1 on pump gas with J heads with custom pistons and quench, for the past 20 years, street and strip
we all agree on 1 thing. want to go fast get the w2s. with the adapter plates on the exhaust ports you can run a 1 7/8 header or even a 2'' if you have a lite car. 3000lbs and under.
Eddies will run pretty fast too....and probably cheaper
And here are a couple of fellas that know.
I have a 1968 340 block i want to build a killer 416 that revs all day and runs off pump fuel with a healthy solid roller cam.
Which heads do I use?
A friend has a set of w2's or should i go aluminum?