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Generation IV Internal Engine
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Old 11-11-2013, 02:57 PM   #1
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Default what cam for 418 stroker with prc 237 heads

looking for a cam that will make the most power possible without shaking the car. car shakes at idle with current cam... want to get away from that... any help is much appreciated... i'd love to make around 500rwhp, but is it impossible with a smooth cam? static comp ratio will be 11.2
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Old 11-11-2013, 06:38 PM   #2
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You can hit 500 with a mid 230's cam.
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Old 11-11-2013, 06:51 PM   #3
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http://www.lingenfelter.com/mm5/merc...7#.UoF7S-LO8T4

The GT11 would fit the bill. Very very lame/tame idle in a big inch motor
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Old 11-11-2013, 08:45 PM   #4
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This is on a smaller engine then 416 inches

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Old 11-11-2013, 11:49 PM   #5
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great! thanks for the help guys...if i can get to 500 with a mid 230s cam in a 418 with a 4 inch stroke would i be able to get a smooth idle from a 232-239 114 cam on a 427 stroker with 4.1 stroke?
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Old 11-12-2013, 12:44 AM   #6
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Just have one custom ground with the lsa at 117, and you'll kill 6 degrees of overlap
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Old 11-12-2013, 01:34 AM   #7
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Get with Martin at Tick or somebody else and discuss your build. A custom spec'd cam is going to be your best best over a shelf grind.
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Old 11-12-2013, 10:07 AM   #8
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im going to throw my 02 in.. i had a 415 stroker 11.5 compression forged everything, fast 102/102 ported heads that flowed 360+cfm and a 24x/25x 61x 62x 112 cam and made 460/460 rwhp through a stalled auto...

another member on here posted that he just hit the 500rwhp mark with a 25x/26X 62x/62x 115 lsa with 13:1 compression....

my point with that is everyone says its so easy to hit 500 but its just not that simple, id recommend the biggest cam you can safely run, keep the lsa 114-115 and if possible bump up compression.

if you have a 6 speed its much more plausible but a stroker motor is going to be running a bigger stall which will kill hp to the wheels, the guy who made 512 with his 421 reported almost 28% drive train loss....

just trying to give you examples from my own experience.... hope this helps a bit
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Old 11-12-2013, 10:09 AM   #9
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would also need to know your intake set up and those types of details which make a huge difference as well as what heads and so on
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Old 11-12-2013, 02:33 PM   #10
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Stalled autos suck if you want a dyno number but who cares because they are fast at the track. There are plenty of guys hitting over 485-505+ on bone stock LS3's with just a 230/234 cam, intake, and headers. You have a stroker, so it will be easier. You don't need a donkey dick cam to make you number and have great driveability.
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Old 11-12-2013, 02:34 PM   #11
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Also, the tune can be modified to lessen the shaking at idle a bit. My tuner asked me when he tuned my car if I wanted a choppier or smoother idle.
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Old 11-12-2013, 10:07 PM   #12
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ok i've also heard from the builder that i would need to be in the mid 240s to get to 500 at the wheels. plus gen 1 cts-v really sucks on dynos. i rem my ls6 put down 320 on a dynojet where c5s were doing 350s. i'm seriously thinking of going 427 stroker and trying a 240s cam with a 115 lsa. i'm gonna use prc 237s my ported fast 92 with ls2 tb for my intake.... as for compression i will try to get it to just under 11.5... and i want really stable and durable rockers so i'm thinking the che precisions look like a worry free product... i've seen people post bolt on c6 zo6 getting 500 but you never know how that's been inflated. my current setup has made as low as 430 on some dynos and 455 on others
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Old 11-12-2013, 10:11 PM   #13
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hey bro are you 6 speed or stalled auto?
heres a guy who made 670 atthe crank on a 427

427ci LS2 Sleeved, 4 barrel TB, port FI, NA, dry sump, engine build.

and heres gmhightech stroker 408 that only made 550 ish at the crank before they went carbed and made a little over 600 at the crank... once again this is the crank, if its a stalled auto, which you would have to have a prettyy big stall you can be assured of a lot of drive train loss..

http://www.gmhightechperformance.com...d_on_a_budget/

so if your a 6 speed you have a chance but stalled auto not so much... stalled auto your gonna lose 23-28% through the drive train but just cause its not at 500 doesnt mean its not fast... id take a 470 hp stalled auto over a 500rwhp 6 speed any day! just my 02 hope this helps..
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Old 11-13-2013, 12:22 AM   #14
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car is 6 speed. same tranny as 04 zo6
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05 cts-v, Tsp 418 ls3, 11/1 compression, prc 247 heads, b&b 1 3/4 headers, 247-250 624/595 114+4, mantic single clutch, ported fast 92 black manifold, ls2 tb, power bond 25% pulley, volant cai, 520rwhp 490rwtq STD, 500/470 SAE
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Old 11-13-2013, 08:04 AM   #15
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With the extra cubes you have I would think you could probably do something in the high 230's, low 240's range on the intake and still idle smooth and drive nice. I'm not an expert though.

Edit: You really need to talk with a cam guy. You have good heads and intake on a stroker. You should be able to hit 500 easily. If stock cube LS3's can do it with low 230's cams then you for sure can and still have great drivability. Martin at Tick. Mark Chacone at Bullet Racing Cams. Ed Curtis at Flowtech Induction.
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Old 11-14-2013, 01:38 AM   #16
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ok i just read this article and its led me to believe that you cant say since others with dif motor displacements, strokes, and heads used such and such cam them i'll def get whatever power with the motor i'm building.

http://www.hotrod.com/techarticles/e...ne_angle_tech/

i'm going to get a cam ground for the right lsa and duration... it seems that everything from head flow cfm per cubic inches, stroke, lsa duration all have to be done specific by application to get the best results. the people making big numbers with their ls3s and ls7s are doing so bc the cams they are using were designed specifically for the stock ls3 and ls7 stroke, compression, displacement, and head flow cfm.

using a off the shelf cam like one of those would be a big waste to me it seems. sure any of those cams would run, but would def not run as good as possible in my specific motor..... let me know what you guys think on this subject? that article was a real eye opener for me
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Old 11-14-2013, 08:52 AM   #17
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Quote:
Originally Posted by Goosecaddy05 View Post
ok i just read this article and its led me to believe that you cant say since others with dif motor displacements, strokes, and heads used such and such cam them i'll def get whatever power with the motor i'm building.

http://www.hotrod.com/techarticles/e...ne_angle_tech/

i'm going to get a cam ground for the right lsa and duration... it seems that everything from head flow cfm per cubic inches, stroke, lsa duration all have to be done specific by application to get the best results. the people making big numbers with their ls3s and ls7s are doing so bc the cams they are using were designed specifically for the stock ls3 and ls7 stroke, compression, displacement, and head flow cfm.

using a off the shelf cam like one of those would be a big waste to me it seems. sure any of those cams would run, but would def not run as good as possible in my specific motor..... let me know what you guys think on this subject? that article was a real eye opener for me
Since you're reading camshaft based articles - try this one:

Chevy High Performance Camshaft Article


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Old 11-14-2013, 12:49 PM   #18
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thanks for the article Ed... all the info i can get helps in the process... sure i know i could get a cam with crazy lift, duration, and pig snout idle and make 500 or even 550rwhp, but if i could get a custom cam designed exactly for my motor i feel similar results can be had without much loss of livability taking into account that with a single cam motor in order for it to perform it will def have to give up some idle quality. i know its apples to oranges but take Ferrari for example... they can get 600 hp from a 4.5 liter v8 that drives baby smooth. granted they have multiple cams ,direct injection, and 14.1 comp ratio, but still they are doing that with 4.5 liters and pump gas.... we ls owners should be able to make more than that with baby smooth running cars as well given our huge displacement advantage and available aftermarket head selection ... 7 liters vs 4.5 is a crazy difference in size... i feel that day is coming soon though with the new direct injection vette motors
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Old 11-14-2013, 08:16 PM   #19
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ok everyone... i've decided what i'm gonna do.... i'm gonna build the motor to just at 11:1 compression using a .040 head gasket. then use a tick performance emissions friendly cam or something very similar. this way i can get decent power and tq out of the motor while retaining a sleeper profile. then if i start thirsting for more power, change the gasket to a gm .058 and lower the comp to 10.5 and stick a procharger on at 7 psi and be done with it. it seems to really get what i'm after boost is the only choice.... plus love the way boosted ls motors sound.... ran next to a zr1 a month or so ago and it sounded great!!!
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Old 11-14-2013, 08:28 PM   #20
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Old 11-14-2013, 08:28 PM
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