Building a new 505 With Callies / Mopar Performance Block

ValiantS said

The past few years, I've taken a liking to Manton! They were cheaper than my local Trend and QUICKER. I'd go right to one of their cheaper non-tapered 7/16". They use a longer end at the lifter to help for any clearance issues negating the need for a taper. I always have used a offset lifter seat on the intakes, that little bit really straightens the trajectory for my liking. Even with a centered lifter I'd bet any clearance needed would be minimal.

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On pushrods, calculating any future cuts on the heads, even a .010 cleanup, should be considered. If you have rockers that mount to a bar, then shims can bail you out if you need a little shorter push rod. If not, then aiming for the short side by a touch is a good idea. I like 7/16 dual tapered pushrods, and they handle 350 SEAT and 950 over the nose springs well . Buy the best once! And if rhe extra $$ you spend only gains you five hp, which you probably will not know you got, consider what you might spend down the road in terms of $ per hp. Had i followed this thought process over my fifty years of hobby racing, i would be probably running 7.50s instead of 8.50s