vortec high performance assembed heads?
#1
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vortec high performance assembed heads?
today i got finaly took my cam out of my 355 to find the lift and duration, the numbers where scratched off so i brought it to a friend at a machine shop to see what he thought it was, he said its definitly a lot bigger than stock cam hes taking a 350 apart now and will find the exact lift and duration of my cam in a few days. Im almost positive the lift will be more than .450 so i will have to get these heads right??http://www.sdpc2000.com/cart.asp?action=prod_detail&catid=277&pid=782
There the same as stock vortec heads but with better springs? and better valves?
There the same as stock vortec heads but with better springs? and better valves?
#3
You don't necessarily need the better heads to get lift of over .450", the OEM springs limit the lift beyond that. You'll need new/better springs and to make sure that the spring retainers don't hit/get close to your valve seals. Vortec heads are good for about .480"-.485" before interference, I believe. The HP Vortec heads from SDPC are worth the money, but just may not be necessary in your case, that's all. Also, performance camshafts obviously need better/stronger springs than the ones they give you even if the lift is .450" or less. The high ramp speeds of XE Comp cams, for instance, require a stiffer spring to prevent valve float at high rpms.
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Car: 91 RS
Engine: 305
Transmission: T5
Axle/Gears: 3.73
FYI my set's retainers hit the seals at .468 and the set of modded heads from SDPC are rebuilt and not new from the last time that I checked. The springs are not hard to change and you can use Crane .050 offset keys and .050 shims to gain more lift clearance without machining.
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91 RS L31 350..... Vortec heads..... Holley 670..... Edel. intake .... Lt4 cam 1.6 rollers ..... Edel. TES headers .. 3" exhaust ..... 5spd 3.08
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91 RS L31 350..... Vortec heads..... Holley 670..... Edel. intake .... Lt4 cam 1.6 rollers ..... Edel. TES headers .. 3" exhaust ..... 5spd 3.08
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Car: 92 Camaro RS
Engine: 305 TBI
Transmission: T-5
For a little more money you can now get the Edelbrock 170cc E-Tec aluminum vortec heads, $999 at Summit for the pair, and they come set up guide plates and springs that will go up to .575 lift. I've been thinking about getting some.
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92 Camaro RS 5.0 5-Speed (Quasar Blue)
T-Tops
14" Open Air Cleaner
3.08 Posi-trac
Edelbrock TBI Intake
Crane cam
Ported & polished stock heads 3 angle valve job
HyperTech Chip
SLP Headers (Ceramic Coated)
UltraFlo cat-back exhaust
74 Dodge Dart Sport 360 (11.2 1/4 mile)
2000 Dodge 1500 Ram Sport
[This message has been edited by DartByU (edited August 04, 2001).]
------------------
92 Camaro RS 5.0 5-Speed (Quasar Blue)
T-Tops
14" Open Air Cleaner
3.08 Posi-trac
Edelbrock TBI Intake
Crane cam
Ported & polished stock heads 3 angle valve job
HyperTech Chip
SLP Headers (Ceramic Coated)
UltraFlo cat-back exhaust
74 Dodge Dart Sport 360 (11.2 1/4 mile)
2000 Dodge 1500 Ram Sport
[This message has been edited by DartByU (edited August 04, 2001).]
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