Total street sleeper
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Launching!
Joined: Sep 2004
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Total street sleeper I have a 408ci 238/242 115 cam with stg 3 heads & 90/90 setup in my SS.
I know its not a huge cam for a 408 by any means, but it is a little much for a daily driver which is what my car is.
I am going to a 232/236 116 setup. This will have much less overlap and should still make decent power, but have a very nice idle.
I thought I would love a big cam, but honestly I was sick of the lope and fuel smell and cold start issues etc...
So what does everyone think? I dont know of too many larger cube motors with this small of a cam, but I am hoping I can get it tuned to run nicely and make a solid ~ 475rwhp. I know with the old cam it would have made around 500+
So my main question is, what do you guys think of the cam selection...keep in mine the goal is "big motor near stock idle"
I know its not a huge cam for a 408 by any means, but it is a little much for a daily driver which is what my car is.
I am going to a 232/236 116 setup. This will have much less overlap and should still make decent power, but have a very nice idle.
I thought I would love a big cam, but honestly I was sick of the lope and fuel smell and cold start issues etc...
So what does everyone think? I dont know of too many larger cube motors with this small of a cam, but I am hoping I can get it tuned to run nicely and make a solid ~ 475rwhp. I know with the old cam it would have made around 500+
So my main question is, what do you guys think of the cam selection...keep in mine the goal is "big motor near stock idle"
TECH Veteran
Joined: Dec 2001
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From: Ft. Lauderdale, FL, USA
Thats wierd, I have a 242/242 .610/.610 114 lsa and my car truly, honestly, no **** idles like a stock LS1, ZERO lope.
I'm surprised you find your cam is too much. I'm going to 248/252 113 lsa.
I'm surprised you find your cam is too much. I'm going to 248/252 113 lsa.
11 Second Club
Joined: Feb 2003
Posts: 5,524
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From: The South
Who tuned your cam? I run a cam larger than that in my otherwise stock 346 and love it. Zero cold start issues, etc.
Personally I think going that small in a 408 is a waste, but to each his own.
Personally I think going that small in a 408 is a waste, but to each his own.
For a sleeper to still make power, you need the proper valve events. You need the proper intake closing point (for power and rpm range) and the right overlap (for the desired idle). Tuning takes care of a lot, but you can still go smaller and keep most of your power if you select the right cam.
If your 408 makes best power with an intake closing point of 50 degrees ABDC (@ .050" for example), then that's where you'd want your new cam to be. Assuming +4 degrees on intake centerline, your old 238/242 115LSA cam had an intake closing point of 50 degrees and 10 degrees of overlap. The newer 232/236 116LSA cam would have an intake closing point of 48 degrees ABDC (if +4 ICL) and 2 degrees of overlap (@ .050"). That's a step in the right direction, but to maintain similar power and rpm range of the old cam, you'd want to retard the cam 2 degrees to have the same intake closing point (50 degrees ABDC).
If the 232/236 116 cam is still not stealthy enough for you, you could always go a little smaller on the exhaust lobe (to kill some overlap) and tighten up the LSA some. A 230/230 115LSA 115ICL (+0) cam would have an intake closing point of 50 degrees ADBC and 0 overlap at .050". It would make power at the same rpm level as the 238/242 cam, but it would have a smooooooth idle and better low rpm throttle response. I doubt you'd lose even 10 rwhp over the original cam provided you have lots of lift with the sleeper cam lobes, but your driveability would be TONS better.
If your 408 makes best power with an intake closing point of 50 degrees ABDC (@ .050" for example), then that's where you'd want your new cam to be. Assuming +4 degrees on intake centerline, your old 238/242 115LSA cam had an intake closing point of 50 degrees and 10 degrees of overlap. The newer 232/236 116LSA cam would have an intake closing point of 48 degrees ABDC (if +4 ICL) and 2 degrees of overlap (@ .050"). That's a step in the right direction, but to maintain similar power and rpm range of the old cam, you'd want to retard the cam 2 degrees to have the same intake closing point (50 degrees ABDC).
If the 232/236 116 cam is still not stealthy enough for you, you could always go a little smaller on the exhaust lobe (to kill some overlap) and tighten up the LSA some. A 230/230 115LSA 115ICL (+0) cam would have an intake closing point of 50 degrees ADBC and 0 overlap at .050". It would make power at the same rpm level as the 238/242 cam, but it would have a smooooooth idle and better low rpm throttle response. I doubt you'd lose even 10 rwhp over the original cam provided you have lots of lift with the sleeper cam lobes, but your driveability would be TONS better.
__________________
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.
Thread Starter
Launching!
Joined: Sep 2004
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Originally Posted by Patrick G
The newer 232/236 116LSA cam would have an intake closing point of 48 degrees ABDC (if +4 ICL) and 2 degrees of overlap (@ .050"). That's a step in the right direction
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thanks for the info...
Thread Starter
Launching!
Joined: Sep 2004
Posts: 246
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Originally Posted by blkZ28spt
Who tuned your cam? I run a cam larger than that in my otherwise stock 346 and love it. Zero cold start issues, etc.
Personally I think going that small in a 408 is a waste, but to each his own.
Personally I think going that small in a 408 is a waste, but to each his own.
