Cam Help!
Cam Help! ok, here is my situation. I have an 82 corvette. 3000 lbs. 4.11 gears, T56. I have a 416 LS3 stroker. Forged eagle crank, H-beam rods and Diamond forged pistons. L76 intake, Holly 90mm TB, SLP 85mm MAF, 25% underdrive pulley, 1.75"/3" long tube headers, dual exhaust, through 3" high flow cats, x-pipe and flow through mufflers. The heads are L92, hand ported, stock valves, patriot dual springs. Flow 342/215 @.60 and 351/219 @.65. The comp ratio is right at 11.3 to 1.
The car will be mainly street driven, but might see the drag strip and road course occasionally. I am a hard street driver, I take off hard and stop hard. I want a choppy idle w/o too much in town low rpm bucking, and to be able to cruise nicely at 75mph and get around 24-26 on the highway. I will also be doing a flex tune for now and all E85 in the future.
I have already paid for a cam in a package deal, so please don't tell me to go to such and such person. I need specs please. I barely know what I am talking about. So far I have had a few people tell me this...
244/250 620/620 @112+2 (my engine builder)
240/250 612/612 @114+2 extreme high lift lobe 3376 intake 3377 exhaust (comp guy)
238/252 ??/?? @114+3 (forum member)
244/248 612/615 @112+2 XER lobe (different comp guy)
So far I am leaning towards #2. Still pretty choppy and will avoid some reversion and get me to 6600 rpm
I only know what people tell me, so please tell me if any of this is BS. I would like around 630 flywheel hp, but I could be out of my gord!
The car will be mainly street driven, but might see the drag strip and road course occasionally. I am a hard street driver, I take off hard and stop hard. I want a choppy idle w/o too much in town low rpm bucking, and to be able to cruise nicely at 75mph and get around 24-26 on the highway. I will also be doing a flex tune for now and all E85 in the future.
I have already paid for a cam in a package deal, so please don't tell me to go to such and such person. I need specs please. I barely know what I am talking about. So far I have had a few people tell me this...
244/250 620/620 @112+2 (my engine builder)
240/250 612/612 @114+2 extreme high lift lobe 3376 intake 3377 exhaust (comp guy)
238/252 ??/?? @114+3 (forum member)
244/248 612/615 @112+2 XER lobe (different comp guy)
So far I am leaning towards #2. Still pretty choppy and will avoid some reversion and get me to 6600 rpm
I only know what people tell me, so please tell me if any of this is BS. I would like around 630 flywheel hp, but I could be out of my gord!
I think most of the successful L92 builds you'll find are running less overlap than the cam you listed. All of the cams listed have 19-23 degrees of overlap at .050". While you can always run more, there seems to be diminishing returns in 416s once you exceed 15 degrees of overlap at .050" with L92 heads. The high flow of the intake valves at low lifts make them very sensitive to exhaust reversion.
Ed Hutchins and Rick from Synergy have combos like this making well into the 5xx rwhp range with cams with much less overlap. Just don't expect to get very many people to offer up their winning combinations for free.
In my opinion, all your cams are about 6-8 degrees of duration too big, especially if you don't want any low rpm bucking.
Ed Hutchins and Rick from Synergy have combos like this making well into the 5xx rwhp range with cams with much less overlap. Just don't expect to get very many people to offer up their winning combinations for free.
In my opinion, all your cams are about 6-8 degrees of duration too big, especially if you don't want any low rpm bucking.
__________________
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.
its worth it to pay the money and get your cam spec'd by this man ^...he did mine for the l92's and even my engine builder was happy with the cam spec, and he is a very hard man to please when it comes to cam selection. and the cam pat g spec'd for me was significantly less overlap then all the ones you have listed.
TECH Fanatic
Joined: Jun 2002
Posts: 1,979
Likes: 3
From: Upstate NY
You need to listen to the right cam person and trust his judgement. The problem is finding the right person to listen to. Not all of the best are sponsors here, nor even visitors.
I suggest some of what you have heard and post is Bovine Scat.
DIY cam picking is a lot like DIY brain surgery...and often about as successful.
Jon
I hear Jessica knows the right people 
I was very nieave to how this whole process worked. After talking to a few people I am more enlightened. I will call my builder and tell him to pull the cam out of my order. I will get ahold of someone who I know will get me the right cam for this motor.
I was very nieave to how this whole process worked. After talking to a few people I am more enlightened. I will call my builder and tell him to pull the cam out of my order. I will get ahold of someone who I know will get me the right cam for this motor.
Last edited by SUPERPOWERS; Jun 5, 2008 at 09:05 PM.
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