Thread: vortec heads
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Old 02-25-2012, 07:50 AM
Senior Member
Join Date: Jan 2012
Posts: 628
Default Re: reduced stems under the valve

Originally Posted by budmspeeco
That is the FIRST time I have ever read or heard that valves with undercut stems were a detriment to flow. Or did I read it wrong? If reworking the guide sticking up (shortened guide in port also improves flow. Taper and blend the iron boss helps) it would only seem that narrowing the valve stem would help too. Would this apply to all heads or just the vortex? Wow, some serious change in general thought on this one!! Buddy
One has to accept some of the new technology without much question . . The Vortec head, by itself, makes you ask, "Why didn't they think of this 30 years ago?" and the Gen IV heads . . Little skinny valve stems, literally flat valves, no seat pressures, high ratio rockers . . all 180 to where we've been going on normally aspirated Engines for 50 years . .

Basically, what we know sometimes isn't what we need to know . .
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