Stock G8 GT cam specs?
07-01-2009, 07:37 PM
#3
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Here's the reply I got from GM Performance Parts when I asked about the HOLDEN L76 cam specs. I also asked if it was true that the grind was different between the de-activate cylinders and the normal cylinders.
Answer 1 = 200/208......0.472/0.479
Answer 2 = Yes
Re: Holden L76 Stock Cam
--------------------------------------------------------------------------
AFM cylinders have slightly different grind ( a bit taller) to accomodate additional compliance of AFM parts --intent is lift event equivalence.
1.70 Exhaust Rocker Ratio
1.69 Intake Rocker Ratio
Lift:
@Cam @Valve
Exhaust: 0.282 0.479
Intake: 0.279 0.472
Cam Timing@0.004" Tappet Lift:
Open Close Adv. Duration
Exhaust: 71 BBDC 33 ATDC 284
Intake: 11 BTDC 91 ABDC 282
Cam Timing@0.050" Tappet Lift:
Open Close Duration
Exhaust: 40 BBDC 12 BTDC 208
Intake: 17 ATDC 37 ABDC 200
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GM Performance Parts
Answer 1 = 200/208......0.472/0.479
Answer 2 = Yes
Re: Holden L76 Stock Cam
--------------------------------------------------------------------------
AFM cylinders have slightly different grind ( a bit taller) to accomodate additional compliance of AFM parts --intent is lift event equivalence.
1.70 Exhaust Rocker Ratio
1.69 Intake Rocker Ratio
Lift:
@Cam @Valve
Exhaust: 0.282 0.479
Intake: 0.279 0.472
Cam Timing@0.004" Tappet Lift:
Open Close Adv. Duration
Exhaust: 71 BBDC 33 ATDC 284
Intake: 11 BTDC 91 ABDC 282
Cam Timing@0.050" Tappet Lift:
Open Close Duration
Exhaust: 40 BBDC 12 BTDC 208
Intake: 17 ATDC 37 ABDC 200
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GM Performance Parts
07-18-2009, 10:27 PM
#6
200/208 .472/.479 116.25LSA, 116.75 intake centerline (based on the valve events posted).
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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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
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
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
11-15-2012, 10:10 AM
#7
Launching!
Join Date: Jan 2008
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Thanks for the cam info, I just picked up a used L76 pull out last week. Will be doing the DOD delete and cam springs and push rod swap next week. The motor should be stout after mods.
I am going to mate it to a 4L80E and throw it in my Datsun 240Z with a 150 shot!
I am going to mate it to a 4L80E and throw it in my Datsun 240Z with a 150 shot!
