any drop in valve springs/retainers for vortec heads.. - Chevelle Tech
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post #1 of 12 (permalink) Old Oct 3rd, 14, 3:08 PM Thread Starter
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Derrick
 
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any drop in valve springs/retainers for vortec heads..

..that are good for .520 lift and don't require any machine work to the guides? the cheaper the better.. engine has a hydraulic flat tappet cam that measures out close to the Edelbrock Perfomer RPM cam (.488/.510 lift) according to my dial indicator and degree wheel.

i know that Z/28 springs are the answer for old school small block heads, but is there any magical combination of readily available cheap parts for vortecs? i used the LT4 springs, retainers, and keepers that came with the HOT cam kit without machine work when i did my Nova motor back in 2000, but the heads were already machined for screw in studs so the guides might have already been cut down.

i'm trying to ween myself off of the gen 1 small block stuff so i can direct my attention towards putting the aluminum 5.3 with LS6 heads in my Camaro, but i want to see just how much the late 70's 305 heads are holding the 355 back by putting the 096 vortecs that are currently on the 305 that used to be in the Camaro on it.. want to do it cheap..

"Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut"

-Hank Hill
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post #2 of 12 (permalink) Old Oct 3rd, 14, 4:00 PM
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Dave
 
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Re: any drop in valve springs/retainers for vortec heads..

I think you have two main options, the kit from Alex's Parts, which are supposed to be a drop-in, or a new set of beehive springs and retainers from Comp (26918, I think). The beehives cost more, but I think you're getting a better spring too. I built a Vortec 350 using a ZZ4 cam for my dad's Vette and used the beehive springs. ZZ4 cam has .510 exhaust lift, and I recall their being some headroom for more lift. YMMV.

-Dave

'70 Chevelle ZZ383/700r4/3.73, [email protected] -- MS3X efi / Hotchkis A-arms & Springs / B-body 12" brakes / 1.25" F-body swaybar / UMI rears & swaybar / JGC PwrStrUpg
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post #3 of 12 (permalink) Old Oct 3rd, 14, 4:08 PM
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Jake
 
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Re: any drop in valve springs/retainers for vortec heads..

Here you go..

http://www.alexsparts.com/valve-spri...d-flat-tappet/

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post #4 of 12 (permalink) Old Oct 3rd, 14, 5:32 PM Thread Starter
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Derrick
 
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Re: any drop in valve springs/retainers for vortec heads..

that might be just the thing..

"Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut"

-Hank Hill
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post #5 of 12 (permalink) Old Oct 3rd, 14, 5:41 PM
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Anthony
 
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Re: any drop in valve springs/retainers for vortec heads..

Crane use to have some too that were good for .550 lift. If you go over to nastyz28.com there was a thread called ghetto grind or something like that. It involved trimming the bottom of the retainers so you wouldnt have to cut the guides. I`ve also heard of guys using offset keepers that would give more clearance.
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post #6 of 12 (permalink) Old Oct 3rd, 14, 8:51 PM
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Andy
 
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Re: any drop in valve springs/retainers for vortec heads..

I was gonna go with this but haven't done it yet...
ls6 springs http://www.summitracing.com/parts/na...9224/overview/
787-16 retainers http://www.summitracing.com/parts/cca-787-16
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post #7 of 12 (permalink) Old Oct 3rd, 14, 9:11 PM
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Re: any drop in valve springs/retainers for vortec heads..

I'm running the trick flow "pacaloy" beehives. Made by PAC, but only around $129 (as of last year when I bought them). Using these and the comp 787-16 retainers definitely works, but maybe not as cheap as the ebay option. Still cheaper than comp beehives though.


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post #8 of 12 (permalink) Old Feb 2nd, 16, 5:48 PM
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Jorge
 
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Re: any drop in valve springs/retainers for vortec heads..

Excuse my newbness here...

I'm putting a 5.3 into my chevelle, and I hear some guys say you should always replace the valve springs on an old vortec, and others only replace them if they're swapping the cam.

I'm looking to build a problem free engine and avoid issues once it's in the car. Does it make sense for me to buy valve springs and retainers? What's the benefit?
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post #9 of 12 (permalink) Old Feb 2nd, 16, 5:55 PM
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Eric
 
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Re: any drop in valve springs/retainers for vortec heads..

Quote:
Originally Posted by JSolo View Post
Excuse my newbness here...

I'm putting a 5.3 into my chevelle, and I hear some guys say you should always replace the valve springs on an old vortec, and others only replace them if they're swapping the cam.

I'm looking to build a problem free engine and avoid issues once it's in the car. Does it make sense for me to buy valve springs and retainers? What's the benefit?


not the same vortec
they are speaking of the 1996-2000(2002 in vans )
gen1 small block truck heads
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post #10 of 12 (permalink) Old Feb 3rd, 16, 4:27 PM
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Tom Terrific II
 
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Re: any drop in valve springs/retainers for vortec heads..

Alex's stuff has been around forever and is well thought of. If I were doing a set of stock type Vortec heads His stuff is what I'd be buying.

Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.
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post #11 of 12 (permalink) Old Feb 4th, 16, 1:35 PM Thread Starter
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Derrick
 
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Re: any drop in valve springs/retainers for vortec heads..

wow... i posted this a year and a half ago...

to button this up: after getting bored one day, i popped a few springs off the vortec heads and measured the retainer to seal clearance. they were all between .540 and .560, which was way more than i needed and a LOT more than everyone said it would be on stock unmolested vortec heads. so i got ambitious one friday afternoon and pulled the 305 heads off the 355 in the car, swapped the springs over to the vortecs, and slammed them on with some head gaskets i had laying around.

going from the 305 heads to the vortecs was like going from a 4 cylinder to a V8: i don't know how much power i picked up, but the car will actually make power up past 6000 rpm now where it would die off at about 4500 before. it has better throttle response, better fuel economy, and is a whole lot faster. the exhaust even sounds a whole lot meaner. it's like a whole different car.. i can't wait to get the 5 speed swapped in sometime in the next month or so. that should be fun until that trans (non WC t5 out of an 85 Z28) pukes it's guts all over the road..

"Detroit hasn't felt any real pride since George Bush went to Japan and vomited on their auto executives, I tell you whut"

-Hank Hill
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post #12 of 12 (permalink) Old Feb 4th, 16, 2:43 PM
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Rob
 
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Re: any drop in valve springs/retainers for vortec heads..

With the .540" measurement between the top of the valve seal and the bottom of the valve retainer you would still need to subtract .030" because that is the minimum clearance required between those two points with the valve fully open. At least you took the time to measure this which is a step in the right direction. Still the widely accepted maximum lift for the stock Vortec heads is between .460" and .480" depending on who you ask so I'd suspect that you may run into problems with this combination eventually while no doubt many others have learned this lesson the hard way hopefully it doesn't come back to bite you on the butt.

65 Chevelle 2Dr. Post,Global West stage 3, Small Block, Small Journal 337cid. Howards roller cam .570/.570" lift 227/233 duration @ .050 LS112, Speed Pro forged pistons 10 to 1, Trick Flow 195,23 degree heads, Holly 750 Ultra, Edelbrock Performer RPM air gap.

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