Old ported heads?

[92 Ty 1173]

I'm sure this is a REPOST and I tried the "search " too many results. What is the advantage to putting stock vortecs as appossed to ported, polished, stockers with 2.02/1.60's. I've read that it's not as simple as bolting on. Do you have to modify the intake, head bolts, and ports?? I have a set of stock heads and can have them machined pretty cheap so is it worth it?

 

[QUICK STORM]

Re: Old ported heads?

no, i don't think so. you have to do some major modifiying to get the stock heads to flow as well as vortecs!

 

[sy#2716]

Re: Old ported heads?

If you are going to put that kind of money in to a stock set of lb4 heads i would at least get l35 heads(direct bolt on) and do to it to them because they resist detonation better. But if you have the money go with ported and polished vortecs with 2.05 intake and 1.60 exhaust. For vortecs you have to add material to the lower intake and redrill the heads for the bolt pattern of the intake. But they are worth the money in the return becasue of a better combustion chamber design and a hell of a lot better flowing head than the stockers and the l35.

jpope

 

[dgoodhue]

Re: Old ported heads?

L35 and LB4 (stock heads) can be ported to match the Vortec flow capacity, (I would think a fully ported stock heads should be able to easily match stock Vortec) Where the real gains are the Vortec combustion chanbers are much less prone to detonation. The Vortec headed cars can run about 6 degree more timing than the stock heads.

 

[92 Ty 1173]

Re: Old ported heads?

Again I'm sure this has been covered but what do I look for in a junk yard when looking for the vortecs. Year? VIN? And what do you mean "add material to the lower intake?" It's a shame these heads aren't more popular like the small block cause those you can get 2.02/1.60's for 5-550 a pair.

 

[92 Ty 1173]

Re: Old ported heads?

Can anyone tell me what year, numbers, etc to look for at a junk yard??

 

[clone 94]

Re: Old ported heads?

any head from a 96 or newer s-series. my heads are from a 99 blazer and have a casting number of 12557113

 

[CKEITH]

Re: Old ported heads?

Just Get In Touch W/ Jwaller And Let Him Fix U Up W/ What U Need.by The Time U Find A Set Of Heads , Have'm Drilled,put Good Valves In'em , A Lil Port Work Done... He Can Do It For About What U'd Have I Them.. He Can Save U A Lot Of Work And Hassle.besides He Has The Heads U Need And Modded Intakes Ready To Go.

 

[CKEITH]

Re: Old ported heads?

Sorry To Post Again But To Answer Your Question....you Could Never Get Out Of The Stock Heads What Vortecs Can Do For U.

 

[Hu Ryde]

Re: Old ported heads?

Good info here on how to port them:

http://www.syty.huryde.com/html/engine/772_cut.htm

casinting info:

http://www.syty.net/forums/showthread.php?t=22785

 

[ghettosled]

Re: Old ported heads?

it's pointless to buy used vortec heads at the junkyard, b/c by the time you are done cleaning them, surfacing them, honing the guides, pressure testing, valve job, etc you could buy a new oem set for the same or less.