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Old 08-16-2002, 06:36 AM
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Post Vortec Head Work

I'm using a set of new vortec heads,from GM, on a '82 pick-up with 350, not a stock 350, (balanced, bored .030, flat top pistons, RPM Performer intake, roller tip rockers, probably Q-Jet carb and either headers or good flowing stock exhaust manifold from late model 350, automatic trans, stock rear axle gear 3.73). Do I need to change the valve springs if I use a cam with 435/460 lift and will the spring surface and boss on the new heads need to be ground?

It was suggested that the new heads be resurfaced due to a slight warppage, that is common with new heads. It was also suggested that the springs be changed with Z28 springs and with the Z28 springs the spring surface & boss would need ground to allow clearance for the coil spring.

Any ideas, this is suggested from the local machine shop.

Thanks for your help.

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Old 08-16-2002, 01:17 PM
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I've got a set of Vortecs that will be going on a 400 (eventually!). I'm told the stock springs are only good to about .450-.460". You can replace these with any stock 1.25" diameter spring such as the "Z28" springs, which I think are good to about .490" lift. You shouldn't need bigger pockets unless you're thinking of a lot heavier springs.
Have you dealt with this machine shop before? I think I'd get another opinion, or maybe somebody out there has had a previous "Vortec experience".
Don't forget you'll need a different intake, which are available from GM or Edelbrock. Good luck.
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Old 08-16-2002, 01:38 PM
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The machine shop I've using is suppose to be the best in this part of the state. I just didn't want to do something a machine shop says for the fear they're in it for the money. They advised me that the pocket would need to be cut for the taller spring and the spring boss would need to be cut for clearance with the coil. I think I might try the heads as they are and see what happens.
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Old 08-16-2002, 02:57 PM
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i can't believe anybody would suggest that brand new vortec heads from a g.m. dealer might be warped. i think i'd find a different machine shop. and vortec heads require factory style grooved rocker arms P/N12495490 to locate the tip of the arm on the valve stem-$50. In Aug.'99 HRM dyno'd vortecs on a 350 with stock springs and a comp cams xtreme energy cam 224/230, 470/480 lift w/o changing the springs. 380ft lbs, 319HP w/performer intake and 1&3/4" headers by the way, they got BOTH L31 iron heads from Burt Greenwald Chevrolet in Akron OH for $395.00! when they changed to a victor intake and speed demon 750 carb HP went to 400 @4,800rpm; and torque 394# @5,700rpm. Yes my next sbc is getting these heads!!!!

i have to correct that first horsepower figure to 375 HP with performer and Qjet and comp cam and vortec heads see post below per HRM august 1999 the 320 HP was with TPI heads and same e-treme cam
SORRY FOR MY CONFUSTION!
[ August 23, 2002: Message edited by: bullheimer ]

[ August 23, 2002: Message edited by: bullheimer ] <img src="confused.gif" border="0">

[ August 23, 2002: Message edited by: bullheimer ]</p>
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Old 08-19-2002, 06:17 AM
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Thanks for the info, do you know right off if the rockers are available in roller tips? Can you clarify one thing in your response, you stated "they got BOTH L31 iron heads" what do you mean by both L31 iron heads, I've been away from the performance scene for awhile so I'm not familiar with some of the components.

I was thinking of using an Edlebrock RPM Permormer intake and probably a Q-Jet carb or possibly Holley 600 spread bore carb. As far as headers I'd like to use a good flowing exhaust manifold if there is such a thing. I plan on using a 212/222 435/460 cam. This '82 pick-up will still be driven daily on regular pump gas, and hopefully I can get some sort of descent mileage, better than I'm getting now with a worn out 305.

Thanks again.
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Old 08-19-2002, 11:27 AM
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from the HRM article they got both heads i.e. 2 for $400 assembled. don't know about roller tips callem and see, they'll obviously be more. just remember that a regular intake will not fit vortec heads, so if you have a performer for one use it. i'm up to my *** in alligators today plus trying to find another hood for my 55-57 chev truck, try to get back to you later, cam should be good.

from what i can make out the GM L31 head is a cast iron vortec with 1.94/1.50 valves and a 64cc fast-burn combustion chamber. they bought both, as in the pair, for $400.my local dealer wanted like $600 so it would pay to ship/shop.

[ August 19, 2002: Message edited by: bullheimer ]

By the way, this is probably the set of heads you have.

[ August 19, 2002: Message edited by: bullheimer ]
to answer your question tho, either i wouldn't do anything at all to these heads, or if you have lots o time on your hands, i would port match the intake manifold to the head=bring out to gastket size of the biggest gasket you can find. the heads and intake will have to be tanked afterwards or pressure washed at the least stuff rags in the ports first anyway to keep out filings. be careful you don't take out to much material

[ August 19, 2002: Message edited by: bullheimer ]</p>
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Old 08-22-2002, 07:00 PM
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I just purchased vortec heads from Scoggin Dickey for $238 each plus roller tip rockers. I think I'll leave as they are, I'm noy sure yet.
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Old 08-22-2002, 10:04 PM
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Hey bullheimer sounds like he knows his stuff!About the rockers,you can check with Brodix in Mena,Arkansas.They casted alot of vortec heads for GM.I dont have the # but get it & call them.They are a great bunch of guys & have always been very helpfull with my questions.
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Old 08-23-2002, 07:56 AM
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Bullheimer you stated in an earlier reply that "HRM dyno a 350 with stock vortec heads and so on and got 319 hp, and changed to a victor intake & 750 carb", did the article say if fuel mileage would decrease sufficiently or minimal. I'd like to keep fuel mileage decent sense I'll be driving this '82 pick-up daily.
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Old 08-23-2002, 10:23 AM
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that hp figure sounds too low, must have been another combination like a 305 with vortec heads cause the article rings a bell, on 350's it put out 375 HP with the cam below and a performer (non rpm) and quadrajunk if you put on a super victor intake and a speed demon 750 comp cams x-trme engergy cam 224/230, 470,480 lift, they got 394 HP, say hello higher rpm's and good bye to low-end torque and gas milage both. this was on their junk yard chevy engine. their cost ($1500)included engine-$130; valve job-125; timing gears, oil pump wires grooved tip rockers-50; mobil one oil and the heads at 400, i guess if you did the super victor trip you could bump the HP with a hotter cam. BUT WOULD HAVE TO CHANGE SPRINGS/BASE
also on this engine where the usual big *** inch and 7/8 headers and 3" exhaust although i've read not to go larger than inch and 5/8's on street engines, 2 and a halfs to the flowmasters and 3 out the end

that 320 figure, once again, was this engine with the comp cam and TPI heads a weiand intake and Q jet, the vortecs and performer brought it to 375

[ August 23, 2002: Message edited by: bullheimer ]
hopefully i got it all right this time as i just spent like 20 minutes on this article

[ August 23, 2002: Message edited by: bullheimer ]</p>
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Old 08-23-2002, 10:40 AM
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[quote]Originally posted by bullheimer:
<strong>that hp figure sounds too low, must have been another combination like a 305 with vortec heads cause the article rings a bell, &lt;snip&gt;[ August 23, 2002: Message edited by: bullheimer ]</strong><hr></blockquote>

you were quite right! Here it is.

http://www.transamtemple.com/article...ne_buildup.htm
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Old 08-23-2002, 11:06 AM
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i try to give you guys honest info, not crap and i kick myself for screwing up. i wish i had my article on the different intakes dyno results but i think that was on a 383 anyway. i generally just quote dyno results out of mags i subscribe to hot rod, popular hot rodding 4 wheel & off road, classic truck and custom classic trucks, i don't retain alot of this stuff in my head cause my engines built and i have nothing on the drawing board other than my 326 poncho at some later date which i know absolutely ZIP about

along those same lines, if you want to see a MASTER of web site diesign check out this site the guys above me CYNSGUY came up with just to show a magazine article: click on any page and there it is. WOW DUDE! you are the shhhtuff!

I Want to direct anyone interested in getting more out of vortecs to the post "Dart Iron or Vortec Heads" and read what somebody who knows something has to say, scroll down and read F-1's post.

[ August 23, 2002: Message edited by: bullheimer ]</p>
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