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Author Topic:   vortec heads
slowpoke
Member
posted January 02, 2003 04:39 PM
Slowpoke, I've got a magazine article that goes into a lot of detail on what to do to Vortec heads. I'll try to find it & provide you with the magazine name & publishing date. If you haven't heard back from me by Monday, send me a reminder or repost to Forum


stockcar5
Member
posted January 02, 2003 07:17 PM
vortecs work fine on older style blocks. there is a 4bbl carb intake that is built to use with the vortec heads..its a gm part # but i dont hve it right now (and its cast iron) and i would put good springs and ***** in studs in the heads. i'd stick with the stock size valves...stock vortecs flow a well as dart sprtsman 2's

luke

sdhnc29
Member
posted January 02, 2003 11:05 PM
The most inexpensive way to make them better than stock , is to simply open them up for 2.020"/1.600" valves . In the flow testing that I have done , this increase in valve size , along with a 3/4" bowl blend , will pick up right at 100 HP worth of air . No .... I didn't say your engine will gain 100 HP , but the increase in air flow is a mathematical gain of 100 HP worth of air . The 2.055" intake valve can be used in the Vortec head also , but unless the combustion chamber is un-shrouded , you will actually lose air flow vs. the 2.020" intake valve .

The Vortec head flow's very good in stock form , and even better with the larger valves as I stated . For a stock type class , these are a brilliant choice ! Unfortunately , the Vortec's stop moving much air at about .525" lift . At this point , the Dart II is a much better choice .

I would also suggest putting in scr*w-in studs , and changing to the older style non-rail rocker if you must use stock rockers , or go to a roller rocker if your rules allow it . You will also need to cut down the valve guides for retainer clearance if you go above .490" or so on valve lift . Also don't forget that the Vortec has a fast burn chamber , and ignition timing should be held to a maximum of 34 degree's .

Steve

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Hendren Racing Engines
Rutherfordton , NC
(828)286-0780


Bob0092
Member
posted January 04, 2003 09:43 AM
Slowpoke, the January 2003 issue of "CHEVY High Perfomance" as an article dedicated Vortec heads. It's worth a look.

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