Sidewinder aluminum heads, anyone using them?

[Challenger340]

Yep,
if you are using 3/8" pushrods on the Stealths you will have to clearance some room for them beside the Port.

I dunno why 440 source doesn't offer a 5/16" "cut to fit" pushrod Kit for their Heads ? instead of the 3/8" ?

Last time I talked to Manton there was no problem with 5/16" tubes for rigidity on that length up to 400 lbs.... so I don't get it ??
Must cost a bunch more ?
and maybe the added cost doesn't sit well for the 440 source site ? But it would sure offer their customers less headaches ?

[b5blue]

  Again thanks for everyone's input!  (Greatly appreciated!)