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Author Topic:   vortec heads
slowpoke
Dirt Roller

Total posts: 18
posted January 02, 2003 04:39 PM
I hear vortec heads are the ticket what do you need to do to them to make them better than stock. What intake will work if you have to run cast intake,will they fit a older stye block thanks for info.

RC Racing
Dirt Maniac

Total posts: 144
posted January 02, 2003 06:36 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
Dirt Full Roller

Total posts: 63
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
Dirt Freak

Total posts: 467
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
Dirt Roller

Total posts: 16
posted January 04, 2003 09:43 AM
heres the intake we used cast iron worked well for us on a 406 http://www.sallee-chevrolet.com/Intake_Manifolds/Cast_Iron_Vortec.html i have the heads both ways 202/160 194/160 and the 194 /160 run alot better to me at least, but i would have the heads reworked for bigger diameter springs ,had problems with stock diameter springs (good springs ) we run a 523/530 hyd cam turning from 6700 to 7000 hope this helps and you got to remember one thing this guy told me what works for me mit not work for you good luck
ps these heads are great until they outlaw them at your track

RC Racing
Dirt Maniac

Total posts: 144
posted January 07, 2003 11:25 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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