Author Topic: SB Camshaft specs  (Read 9055 times)

bc69

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SB Camshaft specs
« on: November 13, 2010, 03:39:24 AM »
Rebuilding a 69 350/300hp and attempting to keep original as possible. Trying to find out info on camshaft, Could not find GM  part number on it but did find the GM stamp. Will most likely have to bore, will replace with orig style flat tops. Will have 041 heads and leave the cast qjet intake and carb. This is a 350 automatic car with air. Would like a slightly overstock performance cam with a good sound but not to loose any vacuum or effect on auto/air situation.
Does anybody have the specs on the stock 300hp cams used in 69 SS's. Or open to suggestions on good cam replacement.

Brad
Brad
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Stingr69

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Re: SB Camshaft specs
« Reply #1 on: November 13, 2010, 12:02:46 PM »
That car originally came with the "929" cam stock. It was the same cam as every other base V8 coupe, sedan and station wagon for many years. You might want to keep it that way but there are other choices. You could step up to the "962" 350/350 cam as you have enough compression for it. Real easy driver. I run it in my Corvette AT with A/C. No issues. The "962" would give you some added performance at the high RPM range where the "929" looses steam pretty quickly.

-Mark.

mopar346

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Re: SB Camshaft specs
« Reply #2 on: November 14, 2010, 01:11:21 AM »
I was actually wondering the same thing. I am building a 383 for my son's truck and I was thinking the 300HP cam was had a lift in the 448 range, I as thinking of going with a roller in the 460-480 range. What were the specs on the 300 horse and the 302 (I know it was a solid lift). Is there a good site for complete engine specs for Chevrolet in general?

Also, which forum would I use for moderate performance questions and conversations?

Thanks, Kevin

L78 steve

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Re: SB Camshaft specs
« Reply #3 on: November 14, 2010, 02:36:40 AM »
The 350/350 cam is a gem. Tons of mid range torque. Has a nice burble note at the tail pipes.
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mopar346

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Re: SB Camshaft specs
« Reply #4 on: November 14, 2010, 02:48:35 AM »
OK, any specs????

Stingr69

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Re: SB Camshaft specs
« Reply #5 on: November 14, 2010, 04:25:54 PM »
IMO - No specs would be worth looking at. The GM cam grinds are very different in lobe profile style and asymetrical. So much so that comparisons of the lift, lobe centers and durtations are meaningless when you compare them to any aftermarket grinds. I have specs but they would be terribly misleading to use them so I didn't post them up. They just do not compare. Apples and oranges.

The "929" runs out of steam very early as most drivers have already experienced. You can retard the cam a few degrees and it will give you a little more RPM. Good for easy cruising and good gas mileage but not much else.

The "962" works better if you have compression in the area of 10:1 (like the OP) and are considering a 6000 RPM red line with cast iron manifolds. You can use headers but they are not a requirement. Good gas mileage for the performance.

6500-7000 RPM with 10.5-11:1 compression would use the solid lifter LT-1 cam with the stock exhaust. Again, you can use headers if you want.

If you have 8:1 compression and want the "962" type performance, you can use a Comp 268H.

If you are running headers and free flowing exhaust and you might want to go to typical aftermarket cams with narrower lobe centers. Match the CR to the cam. The RPM range helps narrow down the selection. You could have several threads on that and never get it nailed down.

-Mark.

bc69

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Re: SB Camshaft specs
« Reply #6 on: November 14, 2010, 08:29:54 PM »
Mark,
Say you use with auto/air with no problems? What kind of idle will the 962 give me?
Brad
Brad
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Stingr69

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Re: SB Camshaft specs
« Reply #7 on: November 15, 2010, 03:52:23 PM »
The idle is just ever so slightly different (rougher) from the base engine. It is difficult to notice. If you look at the factory idle spec it is slightly higher in RPM. Not a lumpy cam at all.

-Mark.

Oaklyss

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Re: SB Camshaft specs
« Reply #8 on: November 15, 2010, 11:27:31 PM »
Mark,
Say you use with auto/air with no problems? What kind of idle will the 962 give me?
Brad
I had a 3896962 in a otherwise stock SS350 engine and there was a nice little lope to it. Worked great. Factory specs are .450/.460 lift 284/278 duration at .008". intake 28-65/78-28.
#3896929 specs .390/.410, 268/278, 29-59/79-19
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mopar346

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Re: SB Camshaft specs
« Reply #9 on: November 19, 2010, 01:25:55 AM »
Thank you, sounds like a great street cam, how is it on torque? Like in a 4X4?

 

anything