What idle/perf with L-79 cam - Team Camaro Tech
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post #1 of 7 (permalink) Old Jan 29th, 05, 10:15 PM Thread Starter
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George
 
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My stock 210hp 327 is about to be modernized! I am looking to retain the stock appearance but update the performance a little bit. I have 4bbl Q-jet (from an '68) disassembled on my workbench, a stock 4bbl intake on the shelf. The 462 heads (1.94/1.5) will be going to the machine shop for a pocket port and clean up. This should get me a setup that is close to the stock 275hp version. I am going with a set of Doug's ceramic coated headers on a 2.5" custom x-pipe dual exhaust built by Ed Hanson and a rebuilt distributor from Daveís small body HEIís. I will be replacing my PG with a 2004R and Iím going to leave my rear end stock (for now). I am running 3.08 gears out back. This is my daily driver, so I need to get those 10-mile trips back and forth to work under control. My machinist recommends a ďL-79Ē style cam. Anyone have any experience with such an animal? How is the idle? Does it match up well with the rest of the motor?

'67 convertible 210HP 327/Powerglide (not anymore!)

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post #2 of 7 (permalink) Old Jan 30th, 05, 02:21 AM
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That particular cam, the L79 327/350HP from GM, likes lots of compression, you may not be happy with it in a 9.0 to 1 compression engine. Lots of similar ones out there in the 222 duration range that probably work better. I had it in my 350 with 9.7 to one and it was marginal for me, idled rough (for its duration), didn't have a whole lot of bottom end torque, but ran well up into the higher RPMs and ran well at highway speeds. Probably works best in a 10.5:1 and up engine.

Mark Canning
1969 Indy Pace Car
350/300HP RPO Z11

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post #3 of 7 (permalink) Old Jan 30th, 05, 02:30 AM
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With 3.08's and a 2004R you will need a cam that works well at low rpm's. With 26" tires you'll be running 75 mph @ 2000 rpm, and a big lumpy cam isn't going to cut it. Don't worry about the idle, choose your parts to work in the rpm range you run. I would look for a modern design cam in the 210-215 degree range.

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post #4 of 7 (permalink) Old Jan 30th, 05, 06:04 AM
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I agree with Mark and onovakind67 there are alot better modern cams for your application.With a 110 to 112 lsa and under 220 at .050 duration you will be happier with the performance.Something like the performer cam 204in and 214 ex duration at .050..420in. 442ex lift.If you want a radical idle you can run the Crane 274H06 218 at .050 .450 lift with a 106lsa.I run it in my car but you will need a 2500 stall converter.

67 Plum Mist Met. 408 TH350 3.08 posi
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post #5 of 7 (permalink) Old Jan 30th, 05, 07:18 AM
 
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As silly as this sounds maybe a CC 252HE is what you need?? BUT no bigger then a 260HE

I was going to say CC's 246PE, "Pure Energy" cam, but I figure if you get your CR. up to around 9.75 or so, it might be too small and cause pinging??

AND a great cheap stand-by, one step up from stock, Performer cam at 204/214 as already mentioned may be just the ticket?

I do know Summits price for it and a set of lifters is right!!

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post #6 of 7 (permalink) Old Jan 30th, 05, 12:39 PM
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The L-79 is a very old design and really doesn't work well with a non OD trans unless you have a pretty loose convertor and a decient set of gears. With your setup you wouldn't be happy. Get a modern much milder cam.
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post #7 of 7 (permalink) Old Jan 30th, 05, 01:11 PM
 
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You know we are getting several of these combinations going right now in the posts..

Hope we are right about the different ones??

I know I just mentioned that I would use either a CC 260HE, a 268HE or a 270S solid in one combination so hopefully the compression and gear is OK for each one we suggest for consideration is all sorta thing???

Earlier, due to lower CR., I think I went smaller........????.........

Please carry-on...

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