067 or 068 cam on stock Gto? - Pontiac GTO Forum
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post #1 of 13 (permalink) Old 06-20-2018, 10:58 PM Thread Starter
 
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067 or 068 cam on stock Gto?

Gonna rebuild my 1967 Gto back to stock. But I was wondering what the pros and cons of a 068 over a 067 cam? Would the 068 raise my already high compression motor even more? I was planning on new springs either way. and would the push rods be the same? What if any can you tell me about aviation fuel for these cars?
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post #2 of 13 (permalink) Old 06-21-2018, 06:13 AM
 
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My car has the 068 in a 389 with the tri power. It was rebuilt with stock style pistons and has probably close to the original compression. I'm guessing it is probably 10.5 and I have no problems with 93 octane. The one thing that I like to do is mix a little 110 octane with the 93. To me it is just a little insurance plus is smells great out the exhaust.
I go to the local dirt track and pick up five gallons at a time. I mix 1 gallon of 110 with 4 gallons of 93. For the dozen or more times a year I take the car out it that 5 gallons lasts all year. I am even thinking about mixing it 1 to 5 this year.
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post #3 of 13 (permalink) Old 06-21-2018, 09:28 AM
 
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I have the 068 cam in my car stock with 10:75. Properly tuned and a mix of 100LL it does fine. Have a spare cam should I ever need it, sorry not for sale. :-)
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post #4 of 13 (permalink) Old 06-21-2018, 11:46 AM
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The 068 will be BETTER with today's gas than a tighter 067 or even tighter 066. Less cylinder pressure. I've run one in my '67 GTO since 1988 when I overhauled it. That was 90,000 mile ago. Works great, but in CA where I am, I can only get 91 octane fuel, so I yanked the heads and installed 87cc 1970 #15 heads for a CR of about 9.3:1. 068 was a great cam for these engines then, and still is. Go for it!
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post #5 of 13 (permalink) Old 06-21-2018, 10:41 PM Thread Starter
 
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Originally Posted by geeteeohguy View Post
The 068 will be BETTER with today's gas than a tighter 067 or even tighter 066. Less cylinder pressure. I've run one in my '67 GTO since 1988 when I overhauled it. That was 90,000 mile ago. Works great, but in CA where I am, I can only get 91 octane fuel, so I yanked the heads and installed 87cc 1970 #15 heads for a CR of about 9.3:1. 068 was a great cam for these engines then, and still is. Go for it!
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Originally Posted by My65goat View Post
My car has the 068 in a 389 with the tri power. It was rebuilt with stock style pistons and has probably close to the original compression. I'm guessing it is probably 10.5 and I have no problems with 93 octane. The one thing that I like to do is mix a little 110 octane with the 93. To me it is just a little insurance plus is smells great out the exhaust.
I go to the local dirt track and pick up five gallons at a time. I mix 1 gallon of 110 with 4 gallons of 93. For the dozen or more times a year I take the car out it that 5 gallons lasts all year. I am even thinking about mixing it 1 to 5 this year.
just what I was hoping to hear. Did some research and that was the conclusion I came up with. But seemed to good to be true. I as well am on the tipping point with 93 octane so I will do a little mixology as well. I tried a multi quote to respond to all. Is that how a multi quote works? But it gave me a error page.
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post #6 of 13 (permalink) Old 06-21-2018, 10:52 PM Thread Starter
 
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O68 Mistress

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Originally Posted by Bob Young View Post
I have the 068 cam in my car stock with 10:75. Properly tuned and a mix of 100LL it does fine. Have a spare cam should I ever need it, sorry not for sale. :-)
some how left you out of the multi quote. I have already been on ebay searching for such a fine piece of GM history. No such luck as of yet That piece there would sleep between my wife an I. Well maybe I exaggerating just a little bit. Thanks for your input.
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post #7 of 13 (permalink) Old 06-22-2018, 10:32 AM
 
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068 here.

Just enough lope to sound good, enough vacuum to keep everything
working properly.

93 octane no ping.

My engine builder said he had the cam custom ground to 068 specs.
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post #8 of 13 (permalink) Old 06-22-2018, 01:05 PM
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Melling SP-7, I believe
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post #9 of 13 (permalink) Old 06-22-2018, 09:08 PM Thread Starter
 
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Will my current stock 067 pushrods,rockers and springs work with this 068 cam? I will be buying them new.
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post #10 of 13 (permalink) Old 06-23-2018, 01:09 PM
 
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Originally Posted by RMTZ67 View Post
Will my current stock 067 pushrods,rockers and springs work with this 068 cam? I will be buying them new.
Yes. Pontiac for the most part kept lift the same - .406" lift. What they did was to increase duration & overlap to make the cam's "bigger." However, aftermarket cams will increase lift on their cams and play around with the Lobe Separation Angles in an attempt to "improve" the cams. So be aware of this and get a cam spec'd as original or you may get into trouble with stock parts and/or stock compression.

Make sure when you get new lifters that they are the correct "Pontiac" style and not the sometimes mis-used Chevy type which will fit the lifter bore, but not work. Pontiac has a specific band height around the lifter body. The Butler website has a comparison in their tech section.

Summit sells one: https://www.summitracing.com/parts/m...7/applications
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