408 xe274

dukes69 said

Mine is a 416 with XE274H and I really don't like it, it is tempermental and idles like crap. I have messed with the tune quite a bit and it is still a little "rough around the edges" if you will.

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Single plane or dual plane intake?

I think if I changed to dual plane mine would smooth some.

Mine seems temperamental to the idle throttle blade adjustment.

And it seems not to like Champion plugs. Switched to Autolite and last longer.