I'm looking to upgrade to the vortec head style. I know I need to modify my intake or buy a vortec style intake. My question is this. I have seen 2 part numbers roaming out the for stock GM vortecs, 062,906 I think are the numbers.
What are the differances and which ones are " better ". Also, what other pitfalls
are common that I need to look out for, IE: cracks, warping, brackets not working, ETC. Thanks in advance!!

 

I am not 100 % , but I 5think one base is for a 9th injector setup , and the other is not.

 

I think you are a bit confused
I'm looking for the differance between those two casting numbers of the vortec heads

 

you're probably already are aware but.....

the tpi won't work with you current intake manifold.

of course you could upgrade to a HSR when you do the heads.

 

If you go to the Sallee Chevy message boards, the administrator has a good thread on the L31 heads. Both are equally as good. He says he knows from testing that they are both great heads, and there is no difference. I have both types on different engines, and can tell no difference, even visually.
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Also, the vortec style tpi intakes have a vette style egr system if you have to have egr. I got my intake from Street & Performance and they sent an instruction sheet that shows a kit, but I found a vette heat tube that runs over to the #8 header to which you weld a pickup for the tube to bolt to. I used vette headers w/vette tube, and had no problems. Then, I took it all off, and blocked egr. It's not required in GA on older cars. I am installing a Ramjet intake on the other engine. They have the Vortec bolt pattern. You can get S10Wildside to make you a harness if you need one.

 

One is for the HD 350 IIRC and has seat inserts on the exhaust.
Some will have a little step left from the insert install.
10 sec on each port with a grinder should fix that.

 

Thanks! Thats alot of good info at the Sallee site!