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Old 05-15-2019, 06:12 PM
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Cam choice

Greetings, I am building a .030 over 65 small journal 327 (flat top pistons) and I had Delta cams grind me a cam with the same specs as comp Cams XS256S (solid lifter) cam. The heads are 291 castings, 1.94/1.50's with a Edelbrock rpm dual plane intake, 600 holley, Hei ignition. Has anyone used this cam and how is it for a daily driver?

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Old 05-15-2019, 07:16 PM
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That's pretty mild.

I've not used that particular grind, but I;ve used bigger grn9nds than that is 350's and 383's that could have been daily driven pretty easily.

It's not even anywhere close to as radical as the factory '69-70 LT-1 370HP 350 solid grind.

With a manual trans, you should be set....with an automatic it will work OK with a stock torque converter but would really respond well to a 2000 rpm stall.

A can't see it behaving al that different from the 350HP 327 hydro cam or the 350HP 350 hydro cam from back in the 60's and those were easily daily drivers..

Ought to make a fun little package to drive. What's it going into??
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Old 05-15-2019, 09:14 PM
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Cam choice

It's going into a 68 Impala coupe. Has a T400, it's a heavy car, so I want low end torque with keeping it stock looking.
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Old 05-15-2019, 11:34 PM
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12-674-4 - XTREME Energy™ Mechanical Flat Tappet Camshafts
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Old 05-16-2019, 08:19 AM
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Yes, I used the XS256S cam with Comp lifters in a fresh 327 in a 55 Chevy sedan. It had approx 9.7:1 compression, Brodix IK180 heads, Weiand Stealth manifold, and old skool 650 Holley VS. It pulled like a freight train from 2500-6000+ RPM with 27.5" tires and 3.42 axle behind a Muncie M20. But the engine was a little "jerky" below 2000 RPM, so not 100% street-friendly. Admittedly, I may have eventually been able to tune it out.

The other issue I had was valve train noise. It wasn't all that bad, but was more "click, click, click" than the "shhh, shhh, shhh" sound of a Duntov 270 or 30-30 cam. And yes, the roller rocker tips were perfectly aligned with valve stem tips, and geometry was spot on. I even tried stock-type stamped rocker arms, with not much change. I put the noise down to the "X" designation. Should be "XN" for Xtreme Noise. I've heard than even the Xtreme hydraulic grinds can be noisy.

If I had a do-over, I'd probably go with an old school Comp 270S cam with slower ramps. Or better yet, something from Mike Jones at Jones Cam Designs. He will tell you that a 327 with its shorter stroke likes a smaller cam than a 350. That's nothing you'd ever guess by reading the big cam companies' specs.

***Edit: Whoops, it was the XS262S that I used. The XS256S that you mentioned should work much better in a heavy car. Of course, it may still have the "wrong" kind of solid lifter noise.

Last edited by 55_327; 05-16-2019 at 08:24 AM.
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Old 05-16-2019, 10:58 AM
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I'm running a Lunati FT hydraulic Voodoo cam in my 355, static CR is 9.75:1, manual, a M20 with 2.52 1st gear and a 3.89 rear.


https://www.lunatipower.com/Product....d=1984&gid=287


Dart aluminum 180cc heads, matched dual plane intake, 1" spacer and a Holley 700. Scat rods as well, engine is balanced. The valve train is very quiet, I'm using Lunati's roller rockers with 7/16" studs.


The car weighs in at around 3500 and it flies. Quite streetable once I went to the steeper rear. It lugged bad around town, something you really need to be aware of. Idle is noticeable but not bad moving in traffic.


What is your 1st gear in the automatic? You may get by with a stock converter with that grind.
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Old 05-16-2019, 11:27 AM
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This cam is really aimed at a short track race class. Hence the fairly short overall duration with lift under .5 inch combined with fast lift, solid lifters, and tight LSA. That said if you're looking for a very streetable solid lifter cam that has good manners but an aggressive sounding idle, this is a good choice.

Bogie
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