Pontiac cam install - Team Camaro Tech
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post #1 of 8 (permalink) Old Feb 11th, 07, 03:02 PM Thread Starter
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Pontiac cam install

So i realize that you guys are mostly chevy guys, but i would like to hear what you think

i have a pontiac 326, which had a cam in it that was way to large for the stock heads, so i removed it and swapped it this cheepo summit cam, http://store.summitracing.com/partde...0&autoview=sku

i installed the crank gear at 12 o'clock and the cam gear at 6 o'clock, just like it should be
spun the engine 2 revolutions to make sure the marks still line up and they do

so the install went fine, but now its time for the break in i have a problem

I was doing the thumb over the #1 cylinder hole to find tdc compression (to stab in the dist) but i get a pulse of air every revolution.
Like every time the mark comes up to tdc, not every other time as it should be
so what do you think is going on here, and how do i find tdc compression?

Last edited by 400bird; Feb 11th, 07 at 09:32 PM.
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post #2 of 8 (permalink) Old Feb 12th, 07, 08:03 AM
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Jim
 
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Re: Pontiac cam install

Watch the #1 valves. When both valves are closed, you're coming-up to TDC.
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post #3 of 8 (permalink) Old Feb 12th, 07, 03:19 PM Thread Starter
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Re: Pontiac cam install

thanks for the help, i will do that

but it concerns me that i have some compression happening on the exhaust stroke
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post #4 of 8 (permalink) Old Feb 12th, 07, 03:27 PM
 
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Re: Pontiac cam install

That's a Pontiac Performer cam.

Should be a dandy for a mild daily driver motor, imho..

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post #5 of 8 (permalink) Old Feb 12th, 07, 06:55 PM
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Re: Pontiac cam install

The path of least resistance.The open plug hole offers less. Once the plug is installed,the exhaust system becomes the next easiest.
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post #6 of 8 (permalink) Old Feb 12th, 07, 08:57 PM
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Re: Pontiac cam install

I've used the Summitt 2801 cam in a 326. It worked great in a stock engine with a same year 389 intake and carter AFB and dual exhuast. This is the same cam as the 068 pontiac cam, used in the tripower 65 & 66 GTO's and other applications in later years.
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post #7 of 8 (permalink) Old Feb 13th, 07, 04:31 PM Thread Starter
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Re: Pontiac cam install

thanks guys
twotoejoe, how was the 2801 on the street, i was worried that it would be to large with the stock heads
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post #8 of 8 (permalink) Old Feb 13th, 07, 08:59 PM
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Jerry
 
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Re: Pontiac cam install

This was a few years ago, but IIRC here is what we did: 65 326 2bbl with about 80k original miles, had never been apart. We installed the 2801 cam with new lifters and new timing set. Added a 4bbl intake and a rebuilt carter AFB from a GTO. Other than adding dual exhaust, we did nothing else. Orignal heads, etc. This car was the 2 speed ST 300 tranny with a 2.56 open rear.

The car operated super around town, and even better on the road. It would cruise 75-80 all day. Now with the 2.56 gear it was not quick off the line, but it ran out smooth. It has a nice, slight lope to it.

I'm now running a 2801 in a 421 tripower Catalina. Same results. Great cam for a street non modified Pontiac.
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