Wanting to use Vortec heads with high lift cams that is:
Check out my post on the TPI board about Vortec heads and springs.

------------------
Chronologically challenged. But still kicking!
'92 CAMARO RS
305 TBI 5/spd (now TPI)
B4C Alt.
Cam change:TRW 198/210 ,450/.460 114 LSA
Stock TBI manifolds
'85 IROC Ex.
14.94-92.00 mph
SPDC base and "350" Vortec coming soon!
'69 camaro-BB/Lenco,1050 dominators, /Pump Gas/no drugs 8.97-150+/3200lbs.
SoCal Thirdgen F-Bodies

[This message has been edited by Dyno Don (edited October 21, 2001).]

 

Thanks Don.

Here's a link for others to find it easier/faster.
https://www.thirdgen.org/messgboard/...ML/004968.html

Screw it. Here's the whole thing.
One Q on the part about cutting the coil. Do you mean cut one coil off of the winding to reduce the spring height? How would you accurately do that so that they are all the same?

AJ

[This message has been edited by AJ_92RS (edited October 21, 2001).]

 

hey Don, was that "14.94-92.00 mph" after the cam change? What type of exaust do you have after the stock TBI manifolds? I think Andy has the same MPH with his stock TBI and cam, and TBI exaust(2.5" cat).

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-Tas
'89 Formula WS.6

Got Beach?

 

What about the spring seats? Will using these springs not require them to be machined either? Please elaborate as to why they would or wouldn't be machined.

 

There is a flat wound dampner inside the round coil spring, pull it out and cut the last 3/8th's of an inch off to keep it from hitting the big part of the guide that sticks up. Then grind it flat again on all 16 springs.
The spring seats don't need to be machined because the Manley springs fit right in and the extra height comes from the retainer that fits .050 higher. (actually .095 higher than the funky Vortec ones).
BTW Andy has headers and cat back ex. read my sig. for exhaust.

------------------
Chronologically challenged. But still kicking!
'92 CAMARO RS
305 TBI 5/spd (now TPI)
B4C Alt.
Cam change:TRW 198/210 ,450/.460 114 LSA
Stock TBI manifolds
'85 IROC Ex.
14.94-92.00 mph
SPDC base and "350" Vortec coming soon!
'69 camaro-BB/Lenco,1050 dominators, /Pump Gas/no drugs 8.97-150+/3200lbs.
SoCal Thirdgen F-Bodies

 

ah ok. I missed the "'85 IROC Ex." part

------------------
-Tas
'89 Formula WS.6

Got Beach?

 

Why not just use the Hot Cam springs??? like 35 bucks for all of them... No damper.


[This message has been edited by fast_broker (edited October 22, 2001).]

 

Because they don't fit without machining the heads. And they coil bind too early.

------------------
Chronologically challenged. But still kicking!
'92 CAMARO RS
305 TBI 5/spd (now TPI)
B4C Alt.
Cam change:TRW 198/210 ,450/.460 114 LSA
Stock TBI manifolds
'85 IROC Ex.
14.94-92.00 mph
SPDC base and "350" Vortec coming soon!
'69 camaro-BB/Lenco,1050 dominators, /Pump Gas/no drugs 8.97-150+/3200lbs.
SoCal Thirdgen F-Bodies

 

????? Hot Cam springs???

They fit on my heads without machining and are good for .525" lift, just like the Hot Cam. Little shim necessary, though... 1.32 OD vs 1.25" OD OEM Vortec. The heads I got had the extra .035" on a radius, so the springs fit.

[This message has been edited by fast_broker (edited October 22, 2001).]

 

Cool, but what are the pressures open & closed?

 

@1.75", 140# pressure, at 1.70", like 150#, I believe 365# at .500" lift... Little strong (needed for the roller Hot Cam with 1.6 rockers) but nice and inexpensive (like $35, not the $20 I had earlier, sorry, forgot) and durable. And GM...

EDIT: I think the Performer RPM springs from Edelbrock are 1.25" OD and have good pressure numbers, too. can't be more than 80 bucks and Edelbrock surely doesn't make them. Made by Crane or someone like that, for sure.

[This message has been edited by fast_broker (edited October 22, 2001).]

 

[QUOTE]Originally posted by fast_broker:
[B]????? Hot Cam springs???

They fit on my heads without machining and are good for .525" lift, just like the Hot Cam. Little shim necessary, though... 1.32 OD vs 1.25" OD OEM Vortec. The heads I got had the extra .035" on a radius, so the springs fit.


Fast Broker: I think you might need to recheck your specs on the LT-4 springs.
Part#12551483 Coil binds at 1.220 Has 101# @ 1.780 according my figures you need .060 0ff of coil bind so w/the LT-4 Hot Cam w/1.6 rockers they are too close for comfort.

 

They don't coil bind at 1.22". You got bad data. And your rate is waaaaay off.... You are looking at an incorrect data for that springs. SDPC has an incorrect piece of data somewhere they were supposed to remove...
aahh, correct SDPC one is:

http://www.sdpc2000.com/cart.asp?act...d=877&pid=2006

incorrect SDPC one is:

http://www.sdpc2000.com/cart.asp?act...d=877&pid=2005

Above CORRECT shows a better feeling for the spring numbers, but they are conservative, too.
===============
Here is a good Vortec head site for optional parts...

http://www.sallee-chevrolet.com/Cyli...ds/Vortec.html

 

The third link shows a camshaft for use with the Vortec head with lift figures of I .447", E .462, and says valve spring change is required...so if I run .454 lift cam and 1.6 rockers that would put my lift somewhere around .480 so I would need to change springs,right?
Just want to make sure I have all my ducks in a row!

 

Oh, this is an old but interesting thread, anyone else verify if the LT4 springs fit on the stock Vortecs? I may need to make another seperate post about that to get any responses...