Cam experts - need help pls!
12-19-2009, 04:56 PM
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Cam experts - need help pls! Anyone have an idea of what I can actually fit with my free valve drop measurements?
Here is the setup:
99 Trans Am
221/221 .558/.558 114 cam - needs to go
PRC 220 cc 5.3l stage 2.5 heads - 2.04 intake 1.575 exhaust - I have the PRC double springs (good to .650) (unsure the cc)
GM MLS gasket
7.4" chromemoly pushrods
---Free valve drop .188 Intake .207 Exhaust---(measured with heads bolted on - distance to piston contact including gasket)
Lid and LS6 intake
Pacesetter 1 3/4" headers
3" offroad Y
3" flowmaster catback w/ 3" cutout
!air
!egr
4000 stall 2.4str
3.73 gears (currently 28" tire for approx 3.55 gears)
shift points 6350 - rev limit 6500
I contacted Texas Speed - they said I can fit 228R 228/228 .588/.588
I contacted Futral - they said I can fit F13 230/232 .595/.585 and possibly larger with more measuring
I contacted LG - they said I can fit G5X2 232/240 .595/.608
I contacted Thunder Racing - they said I can fit RapTR 236/242 .615/.615
Anyone have an idea of what I can actually fit with my free valve drop measurements?
TIA,
Aaron
Here is the setup:
99 Trans Am
221/221 .558/.558 114 cam - needs to go
PRC 220 cc 5.3l stage 2.5 heads - 2.04 intake 1.575 exhaust - I have the PRC double springs (good to .650) (unsure the cc)
GM MLS gasket
7.4" chromemoly pushrods
---Free valve drop .188 Intake .207 Exhaust---(measured with heads bolted on - distance to piston contact including gasket)
Lid and LS6 intake
Pacesetter 1 3/4" headers
3" offroad Y
3" flowmaster catback w/ 3" cutout
!air
!egr
4000 stall 2.4str
3.73 gears (currently 28" tire for approx 3.55 gears)
shift points 6350 - rev limit 6500
I contacted Texas Speed - they said I can fit 228R 228/228 .588/.588
I contacted Futral - they said I can fit F13 230/232 .595/.585 and possibly larger with more measuring
I contacted LG - they said I can fit G5X2 232/240 .595/.608
I contacted Thunder Racing - they said I can fit RapTR 236/242 .615/.615
Anyone have an idea of what I can actually fit with my free valve drop measurements?
TIA,
Aaron
Last edited by The Sad; 12-22-2009 at 10:33 AM.
12-21-2009, 11:26 PM
#4
Is it possible that you are including the head gasket thickness in that free drop dimension. Stock valve free drop is around .150", but if you add a .054" gasket, it's then .204". Your .188" might actually be .134" if you take away the head gasket. That would be normal for a larger valved, smaller chambered head.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2018 Cadillac Escalade 6.2L A10 Pat G tuned.
LS1,LS2,LS3,LS7,LT1 Custom Camshaft Specialist For custom camshaft help press here.
Custom LSX tuning in person or via email press here.
12-22-2009, 12:52 AM
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Yes, I was including my gasket in the measurements. I am trying to avoid taking the heads off if I can help it. I suppose that makes sense as to why I keep getting different answers - each shop may be interpreting the numbers differently. Thanks guys.
Patrick, with this knowledge, do you have any thoughts on how big of a cam I could run?
Patrick, with this knowledge, do you have any thoughts on how big of a cam I could run?