327 Heads 64/76 cc - Team Camaro Tech
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post #1 of 17 (permalink) Old Dec 8th, 05, 08:46 PM Thread Starter
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327 Heads 64/76 cc

I've owned my 67 since 1973. I have not driven it in 20 years. If I replace the 64cc heads with 76cc heads will I be really disappointed. I am hoping to run on regular gas. The existing heads do not have hardened seats.

My current budget is set to upgrade to disc brakes and an overdrive tranny with little left over for engine work.

Thanks in advance for your thoughts.
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post #2 of 17 (permalink) Old Dec 9th, 05, 12:21 AM
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Re: 327 Heads 64/76 cc

Which engine are you using now (210hp-327, 275hp, etc)? I assume it has stock pistons? What are the casting numbers on the heads that are on there now? If you have a 210hp 327 (the base 2bbl model), then it doesn't have much compression to start with...adding even bigger chambers would not be a move in the right direction. As far as unleaded seats go, its not really an issue unless you drive the car a LOT, or plan on driving it hard all the time.
What are your intentions with this car?

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post #3 of 17 (permalink) Old Dec 9th, 05, 07:38 AM Thread Starter
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Re: 327 Heads 64/76 cc

It is the 275 hp 327 (4 barrel). Everything on the car is origonal except for an edelbrock intake and carb (from reading on this site I think I will have the origonal rodchester rebuilt). My future plans include a crate 350. The current plans are to let my high school son drive it.
Perhaps I should just retard the timing to eliminate knocking because I plan to replace in the future? Do I run the risk of cracking the crank and ruining the engine?
I hope to save all the origonal parts incase some day I want to sell and the buyer wants to return the car to origonal.

Last edited by Dave H.; Dec 9th, 05 at 08:01 AM. Reason: Another thought
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post #4 of 17 (permalink) Old Dec 9th, 05, 09:01 AM
 
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Re: 327 Heads 64/76 cc

If you could post the casting numbers that is stamped in the valve spring area under the valve covers, someone here could tell you more about what you have.

As far as timing goes, what is your static timing set to? Even with my low compression 327/210 engine, my motor starts to ping if I set the initial timing above 12* BTDC.
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post #5 of 17 (permalink) Old Dec 9th, 05, 09:37 AM Thread Starter
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Re: 327 Heads 64/76 cc

I'll post those casting numbers when I get home tonight. It's been a long time since those valve covers were off.
Thanks
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post #6 of 17 (permalink) Old Dec 9th, 05, 10:48 AM
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Re: 327 Heads 64/76 cc

Dave, with a 327-275, if you want to run today's regular fuel, you will need to change your heads to drop compression. The casting numbers you post will verify this. Depending on how you do it, this won't be a terrible thing, and might even be good. Slightly later model 76cc heads, say off a hipo '74 350 won't hurt your performance much at all, and perhaps a 70cc edelbrock or similar modern alluminum head will kill any potential for ping AND give you better performance!
Really tho, for $4 a fillup, is it really worth getting away from premium fuel? Even assuming you get some decent factory heads for $500, rebuilt and ready to go, it would take ONE HUNDRED TWENTY FIVE tanks of gas before you start saving any money!
And Granny, if you go to midgrade, you'll stop pinging, be able to bump your timing even more, and probably get better mileage, for another dime a gallon!





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post #7 of 17 (permalink) Old Dec 9th, 05, 11:08 AM
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Re: 327 Heads 64/76 cc

You may need to play with the advance in the distributer but it should run fine on 89 or higher.If you are running vacume and stock advance weights you may have 40 or 50 degrees total advance.

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post #8 of 17 (permalink) Old Dec 9th, 05, 06:16 PM Thread Starter
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Re: 327 Heads 64/76 cc

My head casting number is 3890462. My timing is set at the recommended value which if I remember correctly it is 6 or 8 BTDC.
Thanks for the help.
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post #9 of 17 (permalink) Old Dec 9th, 05, 06:28 PM
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Re: 327 Heads 64/76 cc

Those would likely be the original heads for a 1967 327-275 4 bbl motor. 64cc chambers, 1.9 / 1.5 valves, decent ports, ok heads. With the stock flat top 4 eyebrow pistons your compression ratio was advertised at 10:1, and is probably actually a little less. This is a premium gas motor.





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post #10 of 17 (permalink) Old Dec 9th, 05, 07:25 PM Thread Starter
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Re: 327 Heads 64/76 cc

Okay I accept the fact is was a dumb idea to try and use regular gas. Sounds like you all would suggest ignoring the unhardened valves and seats and just deal with that problem down the road (so to speak).
Thanks
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post #11 of 17 (permalink) Old Dec 9th, 05, 07:28 PM
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Re: 327 Heads 64/76 cc

The valve seats really won't be a problem, that was a wifes tale we all believed back in the 70's.





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post #12 of 17 (permalink) Old Dec 9th, 05, 08:39 PM
 
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Smile Re: 327 Heads 64/76 cc

Jim's right!

Only if you lug it or work it hard!!

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post #13 of 17 (permalink) Old Dec 11th, 05, 12:13 PM
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Arrow Re: 327 Heads 64/76 cc

I've seen several cases where the unhardened valve seats have failed, but in every case, it was in a vehicle used for heavy towing. Haven't seen a problem with pass. cars. I once had a career in cylinder head renewal.
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post #14 of 17 (permalink) Old Dec 11th, 05, 01:07 PM
 
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Re: 327 Heads 64/76 cc

Quote:
Originally Posted by 69mkitmine
I've seen several cases where the unhardened valve seats have failed, but in every case, it was in a vehicle used for heavy towing. Haven't seen a problem with pass. cars. I once had a career in cylinder head renewal.
Same here I have 3 sets piled up that are equal to the worst seats Ive seen. I know 2 sets came off hard worked 3/4 ton trucks the other set were off a car not to sure why they looked so bad. I couldnt believe how destroyed one set was and the motor actually ran. (Darn Chevys want to run forever ) I do know of many not running hardened seats too and they are still going atleast for now.
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post #15 of 17 (permalink) Old Dec 11th, 05, 06:17 PM
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Re: 327 Heads 64/76 cc

I have been running my original 67 Camaro heads on unleaded fuel for ever and no problems. If your taking it apart hard seats would be a good idea and cheap insurance against a problems down the road, as failure is possible. Without them you are taking a chance.

Problem with using old heads is the waterjacket could be eaten away from the inside out and when installing the seats you could hit water, sometimes you see it sometimes you don't. Always mag the head before installing the seats to be sure. I have tossed some good heads over the years after attempting to install hard seats and founs them to be no good after boring for the seat.

You have choices here, mine would be if it's not a daily driver and it not in a truck or used as stated above, rubuild em and run em. If it is a daily driver beware of the valve coming up into the seat.

Joe

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