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Old 12-18-2012, 09:19 PM
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chevy towing cam sbc

Would any one know a of a towing cam that has a noticable idle. Thanks

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Old 12-18-2012, 11:14 PM
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what application? what do you call a "noticable idle"?
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Old 12-19-2012, 06:36 AM
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i know a fraction of what these gentleman know, but, one thing i do know is that marine engines are built for torque and they sure do have a noticeable idle...haha. i would bet that an aftermarket marine cam would make a heavey duty on road towing cam.
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Old 12-19-2012, 12:55 PM
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i mean a nice lop to it thanks
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Old 12-19-2012, 01:28 PM
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i mean a nice lop to it thanks
The motor will not be able to serve two masters. It's either a tow motor with an operating range of idle to 4000 with a nice smooth idle and low rpm torque peak or it's a hot rod motor with a lumpy idle and the wrong operating range for towing. That's just my opinion, you'll have to decide which one to use.

For a towing motor, I would lean toward putting together a 9.0:1 355 motor with a Melling 22109 cam, 1.6 long-slot or roller trunnion rockers, stock cast iron Chevy Quadrajet intake, 750 Q-jet carb set up by Cliff Ruggles and long-tube 1 1/2" headers with H or X pipe before the mufflers. Bolt on all the air cleaner that you have room for (I like 14" x 4"). If you can only find 14 x 2 locally, stack two of them and use a longer stud. Stock replacement valve springs such as Melling VS-380 will work fine.
Cam specs:
194/204 @0.050" tappet lift
270/278 @advertised
0.425"/0.449" w/1.6 rockers
Intake lobe center 104 degrees ATDC
Exhaust lobe center 104 degrees BTDC
Lobe separation angle 104 degrees
Intake valve closes at 21 degrees ABDC @0.050" tappet lift
This cam and static compression ratio will make a stout, pump gas friendly DCR of 8.45:1 and should make peak torque at 3500 or less. I wish I still had access to my DynoSim, I could do some fine tuning on this combo.

Last edited by techinspector1; 12-19-2012 at 01:57 PM.
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Old 12-19-2012, 03:05 PM
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Tech,would vortec heads work with this engine?
Have you tried this combo with fuel injection?
what would happen if you advanced the cam 2 degrees?
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Old 12-19-2012, 03:40 PM
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Tech,would vortec heads work with this engine?
I would think they would be ideal.

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Originally Posted by vinniekq2 View Post
Have you tried this combo with fuel injection?
I don't do EFI. I know absolutely nothing about it and I'm not interested in learning. "Stuck in the 50's with carbs and manual chokes, Atlas Bucron cheater slicks and Traction Masters".

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what would happen if you advanced the cam 2 degrees?
Even more grunt I suspect. Note that the intake centerline on the cam is 104, so I'd be checking closely for valve/piston interference. Advancing the cam relative to the crank will bring the intake valve closer to the piston during overlap, so I'd check closely from 20 degrees BTDC to 20 degrees ATDC during the overlap period. It's usually the exhaust valve that gets close, with the piston coming up the bore and chasing the exhaust valve back onto its seat, but with the intake at 102, it might be less clearance than the exhaust. 0.080" on the intake and 0.100" on the exhaust are considered minimum valve to piston clearances by many builders, as you already know.

Last edited by techinspector1; 12-19-2012 at 03:47 PM.
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Old 12-19-2012, 05:01 PM
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just for discussion,,, I was thinking:

1984 corvette style fuel injection with the edelbrock dry conversion?
would look tres cool.
just an idea,,,
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Old 01-13-2013, 05:05 PM
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First of all...Hello guy's I am new here and thought I would reply to this thread.

For a great towing cam for the SBC check out the Howards Cams hyd.

267/267 seat timing
213/213 @ .050
111 LSA
107 ICL
.430/.430 I lift & E lift

I have a 1969 Chev C-20 2x pick up with a .010 over 350 and a sm465 4spd. Truck has 4.10 rear gears. The 350 has the stock style flat tops with 2 eyebrows .025 down the hole, stock crank, Procomp 64cc 2.02/1.6 190cc heads with Z-28 springs and 1.6 stamped, long slot rockers, .100 longer 5/16 pushrods, Edelbrock lowrise aluminum 2 plane divided manifold, Holley 6210 64jets 30 squirter, Procomp HEI, Lunati t-chain, the above Howards Cams camshaft, stock style rams horn exhaust manifolds, duals to turbo muffs over the dif and exit behind the wheels. The dist has 20* mech. in it and an initial 16* @idle, total 36* @ 2800rpm with 15.5" of manifold vac. Cam is installed straight up.
I know all about the reputation the Procomp stuff has but for me so far so good, can't complain.
Anyhow, this combo is working very well! Idles great@ 700 with just a hint of lope, runs cool and pulls excellent. Wakes up around 1100rpm. This build was for pulling a 6X14 enclosed trailer. It is not a race truck but throttle response and the grunt out of this small block is good!

Just thought I would chime in with my findings if someone is looking for a good towing cam.

Last edited by steeny; 01-13-2013 at 05:12 PM.
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