Cam selection for a solid roller 408
05-23-2007, 10:02 PM
#1
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Cam selection for a solid roller 408 Alright guys I had a SR 408 that was a 14:1 compression race motor with Dart pro-1 heads (flow around 360) etc and I am getting out of the drag racing scene. I am lowering the compression to the 11.5-11.75 area (pump gas) and want to maximize the cam.
Here are the details:
Auto trans with a 3800 stall converter
I like lope but I dont want a HUGE cam that has trouble holding idle, poor vacuum etc.
It is in a light car about 2900lbs so a ton of torque isnt a necessity.
Any recommendations?
Who out there is the "best" to recommend or supply a cam?
Thanks
Here are the details:
Auto trans with a 3800 stall converter
I like lope but I dont want a HUGE cam that has trouble holding idle, poor vacuum etc.
It is in a light car about 2900lbs so a ton of torque isnt a necessity.
Any recommendations?
Who out there is the "best" to recommend or supply a cam?
Thanks
05-24-2007, 12:14 PM
#2
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patrick g or predator are very smart about cams so eith of them should steer you in the right direction. with that light of a vehicle something in the 250/255 range should get you some nice results, maybe the texas giant or similar like a 251/257 .
05-24-2007, 12:25 PM
#3
A solid roller for a 408 is going to look pretty big to those accustomed to seeing hydraulic cam durations at .050".
Lowering the SCR and taming down the overlap will reduce your duration a lot and narrow your LSA by a small amount. Comp makes a number of excellent SR grinds. The exact duration will depend heavily on your head flow info (intake/exhaust flow at mid-lifts especially important) intake manifold selection, exhaust, transmission gearing and rear end ratio. More info is needed to give you anything better than a ballpark figure.
Lowering the SCR and taming down the overlap will reduce your duration a lot and narrow your LSA by a small amount. Comp makes a number of excellent SR grinds. The exact duration will depend heavily on your head flow info (intake/exhaust flow at mid-lifts especially important) intake manifold selection, exhaust, transmission gearing and rear end ratio. More info is needed to give you anything better than a ballpark figure.
__________________
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.
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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
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.
05-24-2007, 01:04 PM
#4
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Patrick thanks for the reply here is the information you said you needed:
Head Flow #'s
Lift Intake Exhaust
.100 73.1 56.9
.200 147.8 121.5
.300 224.8 181.4
.400 275.0 236.2
.500 313.4 264.5
.550 329.2 273.4
.600 339.6 278.5
.700 346.7 284.6
Intake manifold is going to be a fast 90 with NW 90mm TB.
Exhaust is 1 7/8 primaries x piped to 2.5" duals.
Transmission is a 200-4r:
1st- 2.78
2nd- 1.57
3rd- 1
4th- 0.67
Converter is a 3800 stall
rear gear is a 4.10
Head Flow #'s
Lift Intake Exhaust
.100 73.1 56.9
.200 147.8 121.5
.300 224.8 181.4
.400 275.0 236.2
.500 313.4 264.5
.550 329.2 273.4
.600 339.6 278.5
.700 346.7 284.6
Intake manifold is going to be a fast 90 with NW 90mm TB.
Exhaust is 1 7/8 primaries x piped to 2.5" duals.
Transmission is a 200-4r:
1st- 2.78
2nd- 1.57
3rd- 1
4th- 0.67
Converter is a 3800 stall
rear gear is a 4.10
