mild 350 dyno results - Team Camaro Tech
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post #1 of 11 (permalink) Old Nov 5th, 16, 05:58 PM Thread Starter
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mild 350 dyno results

I had my 68rs/ss on a chassis dyno for the first time. Wondering if it is close to where it should be. It is a .040 over 350 with 10:1 flat tops. Using SR torquer 2.02 heads with a home made port job. Head chamber is 64cc. Using a the Speed Pro CS-179R cam. Its a near duplicate of the original 327/350hp cam with slightly shorter seat timing, around 290/290 @ .050, .447 lift with 1.5 rocker arms and 114LSA. Roller rockers and Edelbrock Q-Jet RPM intake. Tuned Q-jet is carb with help from Mr. Ruggles. 1 5/8 full length headers with "X" pipe and dual exhaust with turbo mufflers and tailpipes. Running about 34 degrees timing with 9 degrees initial. Runs were as i drove it in. The best was 292 rear wheel HP with 324 ft/lbs. Peak power was around 5200-5300 RPM. I understand that flywheel power is somewhere around 20-25% added to these numbers. So that would put it at 350-375 HP with roughly 400ft/lbs of torque. Was showing a little lean on the top end and I did not try any more timing. Will make some adjustment in these two areas this winter. Can I get much more out of this combo and is it pretty much there?
Phil
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post #2 of 11 (permalink) Old Nov 6th, 16, 06:01 AM
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Re: mild 350 dyno results

Good numbers! By getting more out of this combo how much more do you mean? 10-20hp? Just richen it up and run with it. If you get bored put a wet nitrous shot on it and get an easy 50-100hp more out of it. Welcome to the hp addiction.
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post #3 of 11 (permalink) Old Nov 7th, 16, 03:25 AM
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Re: mild 350 dyno results

My .060 350 with trick flow 195cc 62cc heads, 228/234 @ .050 with .484/.490 lift @ .050 cam, performer rpm manifold, 650dp, 1.5 roller rockers made 311 rwhp and 346 lb ft of torque. I run 36 degrees of timing. I was also lean in the secondaries on the dyno. I have factory style dished pistons .030 down in the hole so my compression is a little low for my combo. I have 1 5/8 headers into a 2 1/2 inch flow master exhaust, a 4spd and posi rear also. I would say your right where you should be. I would rejet the carb and go back and play around with timing Maybe you can pick up a couple hp.

My brother has a 72 nova with a slightly bigger roller cam than me, rhs 180cc heads, 670 vac secondary carb with a 200r4 trans and made almost exactly what you did.

Right after I dyno, I tried to figure out crank hp. Without actually putting the engine on an engine dyno it's all just a guess. I found articles where the factory big block copo 4spd cars made less rwhp than I did, but according to the industry avg of around 15 percent loss for a 4spd, I'm only making around 370 crank hp. I was driving myself crazy, but then I just decided to have fun with what I have. I'll save up for a bigger engine later.
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post #4 of 11 (permalink) Old Nov 7th, 16, 03:35 AM
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Re: mild 350 dyno results

290 @ .050 ???
No time to look for cam right now....but thinking its 290 Advertised and 2teen to 2twentys @ .050.

Good numbers regardless...

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post #5 of 11 (permalink) Old Nov 7th, 16, 06:56 AM
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Re: mild 350 dyno results

Phil, those are very respectable numbers for a 350. You might be able to pick up another 10-20 more hp with some tuning and tweaking on your timing and air fuel mixture. It sounds like a nice running engine.

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post #6 of 11 (permalink) Old Nov 7th, 16, 06:02 PM
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Re: mild 350 dyno results

Good numbers and what Matt said.
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post #7 of 11 (permalink) Old Nov 7th, 16, 06:07 PM Thread Starter
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Re: mild 350 dyno results

Thanks for all the replies. I guess I am in the ball park for my street driven RS/SS. I did have a Comp cam extreme energy XE274H with 230 and 236 duration and 110 lobe separation. Got tired of the low vacuum and funky idle. I switched to the current Speed Pro to get better street manners. Basically a copy of the old GM 151 cam. Vacuum increased to 15 and low end was greatly improved. Torque curve from the dyno runs are pretty flat. Idles better. Next spring I hope to make some more runs with some secondary tuning and timing changes to see if I can squeeze a little more from it. Would be nice to hit the even 300 RWHP mark.
Hummm. Nitrous might be fun.
Phil
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post #8 of 11 (permalink) Old Nov 8th, 16, 05:44 AM
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Re: mild 350 dyno results

That's why it's called giggle gas.
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post #9 of 11 (permalink) Old Nov 9th, 16, 07:21 AM
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Re: mild 350 dyno results

What did the XE274 do at idle? That cam is a hair bigger than mine, and I have a rock steady idle. Just curious

1969 Camaro 350, Trickflow heads, ST-10 4spd, Hotchkis suspension, Baer SS brake kit, moser 12bolt
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post #10 of 11 (permalink) Old Nov 9th, 16, 10:16 AM Thread Starter
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Re: mild 350 dyno results

vacuum was only at 11 making it hard to get a smooth idle and adjustment. I found the low end was lacking, between 1500 -2200 rpm. Above the 2200, the comp cam started to get into it power band and really seemed to work good in the mid range(3500ish). For my application, as a street cruiser, the switch to a slightly smaller and wider lobe separation cam made a huge difference in low end. Vacuum increased to 15 and carb adjustments were easier to get right. Lower end torque seemed to increase, although I did not have any dyno runs before the cam change to compare. If I going to the track for some quarter mile runs often, perhaps the bigger cam shaft may have been a better choice.
I hear and read that some of 6.0litre LS engines make very good power and still idle smooth in near stock form. I am thinking that may be a decent upgrade some time in the future.
Hope this helps. Phil
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post #11 of 11 (permalink) Old Nov 9th, 16, 05:27 PM
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Re: mild 350 dyno results

Gm made there high performance cams with a wide lobe separation around 114, comp is always at 110 and was the reason you had poor vacuum numbers.

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