Spectre

I just found a distributor of Standard Abrasives not too far form where I live, so ill be working on the heads a bit ..

Id like to know, after reading threads and diffrent types of options,
can I simply install umbrella seals, and +.50 keepers with the maching springs, or is it a must to have them machined for more lift ?

2QuickNovas - Vortec Heads

this page tells me I can get away with it ... unless i'm (or they're) wrong.

It is my first time working cylinder heads, and I intend on completing these, and then continuing the hobby with other castings.

Im doing all the work myself, so if I can get away without the valve guide machining, Id go for it.

any info greatly appreciated

Sonix

iTrader: (1)

umbrellas don't really have much to do with it, but .050 offset keepers "taller", will give you .050" more distance between rocker stud (or positive seals), and the retainer.
Remember you still want the right open/closed spring force, and that offset throws that off as well I think.
Machining down those guide bosses isn't the end of the world, it might run you $80.

Vortec heads don't flow well with a lot of lift anyway, they experience port stall in the .530"ish lift area. Shoot for .500" lift or thereabouts, and more duration if you want the added power (don't think you'll need to go crazy to get gobs of power though).

xpndbl3

iTrader: (5)

i'd get the heads machined for screw-in studs, spring pockets opened up and the guides machined down. now with my combo I had all that done and for my particular keepers and retainers, along with the installed spring height I needed I only have .530 inch lift clearance for a cam, with .060 safety factor calculated in. FYI check the heads yourself after you get them back. Luckily I'm running a smaller cam than .530 barely so I'm in the clear. More duration=more power, but at a loss of driveability.

Spectre

Vortec Heads Max Lift Vortec Heads

also in this one, they emphasise that guides dont have to be machinded.

Its not really that I dont want to have the heads machined, I plan on buying the valve guide cutter, and the valve seal remover, I was just implying that
Id like to complete the work myself , and doubt that I can get those tool
and perform the work properly, by myself, so I started to look for alternatives ..

Ill get the guides machined if its the only logical way to go, whicjh bring me here

xpndbl3

iTrader: (5)

i would do it the way I suggested and not run those daytona seals.

naf

iTrader: (7)

I, too, would recommend the machine work, but there's a recent article on carcraft.com on comp cams beehive springs that claim to add lift without the machine work. A bit pricey for springs but probably a less expensive alternative when factoring in the purchase of a valve guide cutter, etc. (and you still need to purchase springs). Screw in studs are a must, though.

F-BIRD'88

One alternative ot machining the valve guide tops for more lift is to limit the valve lift of the cam you install. Isky Cams has some great "lift limit cams" the are just right for a 350 vortec street motor. Isky Cams#201278 is 278-278-.450"/.450" 106 LSA 234@.050" At only .450" lift no machining is required. Use Manley #22410 valve spring (no machining req) Don't be mislead by the modest lift, this cam makes power. Wants a hi rise "RPM" style intake, headers, a high stall converter and high rear end gears.

Sonix

iTrader: (1)

normally I don't agree with the idea of adding duration but not lift... But in this case i'd have to say F-bird is on to something here.

FWIW, I remember reading a post here, which was linked to a Vortec head build up on another forum. I guess one of the engineers who helped design the Vortec head posted on there.

He had a 350 I think, with a 270* @.050 duration cam (not a typo there), and something like .480" lift. Solid flat tappet. It ran low 11's I think. He was talking about vortecs lift limits and port stall, etc, and why he used a .480 lift cam and not higher... It wasn't due to rules, he was trying to go as fast as possible on a **non ported** vortec headed car. The only rule was to run vortec heads with 0 port work done, any lift or duration was a-ok, and he ONLY ran .480" lift by choice.

five7kid

iTrader: (14)

What induction are you planning on running? If TPI, I doubt it would be happy with that 106 LSA cam.

Rather than fooling around with retainers or cams, I'd just start off doing it right with properly modified heads Vortec Cylinder Heads, Vortec Head Kits, Cylinder Head, Chevy Vortec Cylinder Heads - SDPC .

shaggy56

RHS also makes a pretty good vortec head. It flows better than stock vortecs and is also setup for race.

xpndbl3

iTrader: (5)

you know what link this is to? That's a lot of HP compared to the typical high 11s/low 12s buildups that I've seen.

Sonix

iTrader: (1)

I tried and tried, and can't find it again

if you find it let me know....

I think he put it in a nova or something... solid flat tappet cam, like 270* at .050, .480" lift or so.... damn, I keep trying to find this and i'm coming up blank...

Wheel Spin

Could well be this excellent stickied thread on NastyZ28.com, by Dirt Reynolds. Has some quotes by one of the design engineers of the Vortec head. Been looking for this info myself, planning a 383 Vortec/HSR.

Vortec Cylinder Heads: The Definitive Guide - NastyZ28.com

Sonix

iTrader: (1)

BINGO!
"Gary Penn" is who i'm thinking of. On one of those 7 pages of that thread there's a link to his own personal website with some more info. but that one post about halfway down shows his combo.

shaggy56

Hes running a hefty rear and tires.

Spectre

I just ordered the valve guide cutter for vortec heads (cuts guide to .530) the stud puller, and the valve seal installer

the guy was telling me you can just remove the seals by hand or with a vise-gripe ..(dont know about the hand part lol) and then install them with the tool.

crane apparently doesnt sell them anymore, thus got them from compcam, and I also found a distributor of standard abrasives, (http://www.sa-motorsports.com/diyport.shtm), so ill be ordering the deluxe porting kit, with the gasket removal kit.

oouuff lol, now I need an electric grinder, and a few bits I cant think of...

Monday will be quite a day !

redcamaro83

this might be easier

Valve Spring Upgrade - Beehive Valvesprings for the Vortec V8 - Car Craft Magazine

92green3RdGen

this man speaks the truth i have these exact springs and i didnt need to machine guides or anything, well i guess i had them machined for compression but they work awesome!!! i would really recommend these because you dont have to deal with getting them machined all you have to do is put the springs into the heads and presto higher lift