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Old 12-06-2021, 10:14 PM   #1
Hpr17
 
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Questions on downsizing cam

Hey all, so the title says it all. Iím looking to purchase a 2011 Camaro LS3. Itís at a great price with Low miles. My concern is the previous owner dropped in some Texas Speed and Performance cams (I think stage 3 or 4). These are HOT cams. Duration is 231/246, lobe lift is .376/.362 and valve lift @ 1.7 is .640/.615. Full bolt ons, with a dyno tune.
Sounds great, right? Over 500 hp with no forced induction.
Only small problem, is Iím planning on it being a daily driver, maybe some long range road trips. I refuse to deal with that choppy, loud, shaking idle and 9mpg. I donít want a drag car, I never go to the slicks, I just want something thatíll get acceptable fuel mileage and get me to work with some v8 power for the occasional sprint to 100. Nothing crazy.
Now my question hereÖ.this car is such a great deal (probably because itís been raced all itís 60k miles life) that Iím perfectly fine with literally undoing a super badass, hot cam. I want to downgrade it back to either stock, or just a slightly hotter than stock cam. NowÖ.if I were to swap the cam out for a stock one, considering the immense difference in size between this one and stock, will I have to also replace the valve train with lighter, stock parts as well? Or can I keep running the heavy ones that were installed with this cam? Also, will a handheld tune or custom tune from Lewis Eaton of ******* be enough to get it back to ďstockĒ tuning or will I have to drive 6 hours to the nearest dyno and spent several hundreds of dollars, just to undo and basically waste all the badass-ery in this engine?
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Old 12-06-2021, 10:24 PM   #2
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Or last option, just find another Camaro that’s been stock or mostly stock…? My main reasoning for wanting this car is that it’s $6,000 below book value, from an authorized GM dealership. Not private, not a used dealer.
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Old 12-06-2021, 10:50 PM   #3
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That chop is more in the tune than the upgrades. Somewhere on the forum acammer with GPI has videos proving this point. 9MPG is low I run low 11's in the 1/4 and have a bigger cam, 3:91 gears, tons of upgrades and tuned to drag, but could still daily it and get 17mpg on the hiway at 70mph. Maybe change the rear gears if you want better gas mileage and get a quiter exhaust. Plenty of people drive cars like mine daily or even more radical, and you don't have to run slicks. Car will just be more of a beast than stock. GL with your choice.
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Old 12-07-2021, 12:52 AM   #4
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Awesome thanks for the tips. As far as the mileage, I was just spitballing a random number haha I expected it to be worth than factory but was exaggerating slightly at 9mph. So my last, biggest concern is again, because of the insane valve lift of the cam, should I be worried about the valves smacking the piston head? I have no experience with hot-cammed cars but I’ve read on other forums and watch videos where people warn that running a cam with such a close tolerance to the head can be very risky, claiming that simply missing a shift can potentially be enough to stick a valve through your head, or snap a valve rod. Is this true?

I’m sure most on this site are aware, but just a refresher the stock cam has valve lift in somewhere around .550. Jumping to .640 just seems…..absolutely insane.
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Old 12-07-2021, 01:01 AM   #5
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Sorry, again I’m showing my ignorance. I call .640 intake lift insane but I honestly don’t have much experience in this field. But based on my research, seems like it’s hard to find any companies that make cams larger than .600 lift for street use.
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Old 12-07-2021, 07:09 AM   #6
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If you go to a smaller cam DynoSteve might be able to tune it for you remotely and he gives free lifetime re tunes if you mod your car further. The updated springs and everything else is fine to keep and with any aftermarket cam you should replace the springs every 20k miles.
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Old 12-07-2021, 07:23 AM   #7
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Quote:
Originally Posted by Hpr17 View Post
Sorry, again I’m showing my ignorance. I call .640 intake lift insane but I honestly don’t have much experience in this field. But based on my research, seems like it’s hard to find any companies that make cams larger than .600 lift for street use.
Pushing stock rockers beyond .625 lift will bring problems in time. Some say that number is .650.

For a daily driver a TSP endurance profile keeping intake lift at .615 and duration under 230 will lose less bottom end torque. On the exhaust side lift above .540 doesn't buy you much (using the 1/3 diameter to lift ratio) but many cams still come with .595 lift.

A 220 .615 intake with a 230-234 .595 exhaust would be a decent performance gain that will have excellent parking lot manners (stock gears & convertor, etc.) and with a good tune still net near stock mpg. It would also make for a happy valve train - long lasting and quiet. Would be a good candidate for beehive springs. Cam Motion makes a stage 3 street 220/230 .595/.595. Just most people want bigger numbers.

With .640 lift and being raced - I would replace the springs just for piece of mind. Probably lifters and buckets too while the thing is apart.
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Old 12-07-2021, 08:29 AM   #8
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Quote:
Originally Posted by Hpr17 View Post
Hey all, so the title says it all. Iím looking to purchase a 2011 Camaro LS3. Itís at a great price with Low miles. My concern is the previous owner dropped in some Texas Speed and Performance cams (I think stage 3 or 4). These are HOT cams. Duration is 231/246, lobe lift is .376/.362 and valve lift @ 1.7 is .640/.615. Full bolt ons, with a dyno tune.
Sounds great, right? Over 500 hp with no forced induction.
Only small problem, is Iím planning on it being a daily driver, maybe some long range road trips. I refuse to deal with that choppy, loud, shaking idle and 9mpg. I donít want a drag car, I never go to the slicks, I just want something thatíll get acceptable fuel mileage and get me to work with some v8 power for the occasional sprint to 100. Nothing crazy.
Now my question hereÖ.this car is such a great deal (probably because itís been raced all itís 60k miles life) that Iím perfectly fine with literally undoing a super badass, hot cam. I want to downgrade it back to either stock, or just a slightly hotter than stock cam. NowÖ.if I were to swap the cam out for a stock one, considering the immense difference in size between this one and stock, will I have to also replace the valve train with lighter, stock parts as well? Or can I keep running the heavy ones that were installed with this cam? Also, will a handheld tune or custom tune from Lewis Eaton of ******* be enough to get it back to ďstockĒ tuning or will I have to drive 6 hours to the nearest dyno and spent several hundreds of dollars, just to undo and basically waste all the badass-ery in this engine?
I run this same cam from TSP, it is their "stage" 3 cam. I have daily'd my Camaro for 3 years now with that cam and had a 3200 stall converter, but now run a 4200-4500 stall converter and get anywhere from 14-16 mpg in town and 22.5 on the interstate doing 72 mph. Good luck with your decision.
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Old 12-07-2021, 11:23 AM   #9
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If you're shopping for a DD I'd say pass on this one. With those mods it's probably been ran pretty hard, you don't know how the previous owner maintained it. What's your mechanical ability and what's your budget? With all of the cost and hassle of cam swapping, tuning etc you'll be miles ahead in time and frustration if you find another vehicle. This would be a good car for someone who wants a Hotrod to tinker with and has another car as a backup/daily driver. There's probably a reason why it's $6K low in today's market.
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Old 12-07-2021, 11:34 AM   #10
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Buy a stock car if you want a stock car. Doesn’t make sense to buy a modded car then spend more to del-mod it. That said plenty on here drive cammed cars daily with no issue.
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Old 12-07-2021, 12:28 PM   #11
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I’m gonna go with Arizona and Blue on this one. You are creating more work/expense for no gain.
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Old 12-07-2021, 01:56 PM   #12
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^^^ +1
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Old 12-07-2021, 02:19 PM   #13
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Something is wrong. I get 10mpg with my 416 on E85 with a th400 and 4.10s
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Old 12-07-2021, 05:08 PM   #14
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Thanks everyone, you’ve given me a lot to think about and some great input! I’m meeting them tomorrow for a test drive, I guess we’ll just see how she goes. One more option I didn’t consider…this thing is priced low enough that even if the engine does blow within the first year, I can drop a blueprint LS3 in it for around $5,000 and still come out ahead. Heck, I could do the LS3 hot-cam engine which makes around 490 hp/470 tq and still pretty much break even compared to the other cars I’m finding for sale. And most of those have 100,000+ miles.

Here’s a quick sneak peek of the car, from the dealer themselves
https://m.youtube.com/watch?v=lqstKm...ature=youtu.be
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