254/258 or 248/250 cam for 408
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I was wondering if I might be able to get some guidance on a cam selection? I have a 408 with 11.1 Cr. GTP Heads Flowed 330@650 Fast90/90, headers
1 3/4-1 7/8 3 1/2 collectors Race weight 3350. I will be spraying a DP 200-300 shot @ times on it and its a T56. I was wondering which cam to go with . I have both cams already but trying to decide on which one to install. Motor is going in this weekend I am leanning on the Cam Motion cam.
Comp Cam 1 254/258 622/622 111L/S no advance
Intake Exhaust
.006 307 311
Valve timing open Close
@.050 Int. 16 58
Exh. 60 18
Lobe lift Int. EXH.
.365 .366
Custom Cam motion has been on a cam doctor correct specs 248.7 / 250.1 628/631 112 + 4 advance
Lobe center intake EXH.
107.8 ATDC 116.5 BTDC
Valve timing open Close
@.050 Int. 17.2 51.5
Exh. 60.9 9.2
Lobe lift Int. EXH.
.396 .371
1 3/4-1 7/8 3 1/2 collectors Race weight 3350. I will be spraying a DP 200-300 shot @ times on it and its a T56. I was wondering which cam to go with . I have both cams already but trying to decide on which one to install. Motor is going in this weekend I am leanning on the Cam Motion cam.
Comp Cam 1 254/258 622/622 111L/S no advance
Intake Exhaust
.006 307 311
Valve timing open Close
@.050 Int. 16 58
Exh. 60 18
Lobe lift Int. EXH.
.365 .366
Custom Cam motion has been on a cam doctor correct specs 248.7 / 250.1 628/631 112 + 4 advance
Lobe center intake EXH.
107.8 ATDC 116.5 BTDC
Valve timing open Close
@.050 Int. 17.2 51.5
Exh. 60.9 9.2
Lobe lift Int. EXH.
.396 .371
Last edited by Street Racer; 09-27-2007 at 07:20 AM.
#2
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The 1st cam is way too big for a 408 with 11.0:1 compression. The second cam has a much better IVC for the FAST 90 on a 408 and the exhaust valve opening and close have a better relation to the intake events for nitrous. No question, the second cam is a better choice.
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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.
![](https://ls1tech.com/forums/signaturepics/sigpic210_1.gif)
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.
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We Basically Have The Same Set Up I Think If I Remember Correctly My
Cam Is A 245/255 645/655 @ 114 And I Got 568/520. The Only Main Difference Is The Heads I Have Afr 225. My Car Drives Or Better Yet Drove Prety Good, Had A Speed Density Tune
Cam Is A 245/255 645/655 @ 114 And I Got 568/520. The Only Main Difference Is The Heads I Have Afr 225. My Car Drives Or Better Yet Drove Prety Good, Had A Speed Density Tune
#7
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Originally Posted by Patrick G
The 1st cam is way too big for a 408 with 11.0:1 compression. The second cam has a much better IVC for the FAST 90 on a 408 and the exhaust valve opening and close have a better relation to the intake events for nitrous. No question, the second cam is a better choice.
I have the big cam but I also have 13.1 compression on my 408 with stage 3 heads (ls6) and fast 90/90. Is that cam ok for my set up? Sorry don't mean to hi jack.