HELP engine tune up advise needed 67 327 - Team Camaro Tech
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post #1 of 3 (permalink) Old Nov 22nd, 05, 09:07 PM Thread Starter
 
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HELP engine tune up advise needed 67 327

I have a bone stock 67 with the 295 hp 327. I boleave this engine hae 11.5:1 compression. Is their any way to play with the timing to get better milage or use low or mid grade gas. What oil should I use if the car has about 113,000? are their any outer economy tricks? I heard headers and an upgraded intake and high flow mufflers increace gas milage.
Thanks,
Jon

Last edited by jtmnoxville; Nov 22nd, 05 at 09:29 PM.
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post #2 of 3 (permalink) Old Nov 23rd, 05, 05:59 AM
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Re: HELP engine tune up advise needed 67 327

That sounds like a lot of compression. Have you done a simple cranking compression test? If you've got 200+ psi cranking then I would be gentle on the timing. I would suspect that your cranking psi would be around 170.

Timing is where I would focus. Make sure the distributor mechanism is all working. The mechanical advance mechanism should move easily and allow around 24 degrees of advance, in by about 3000 rpm. Set initial timing at 10 degrees advanced, for about 34 to 36 total at 3000 rpm or so. You can check this with a test light.

For more mileage, I would focus on the vacuum advance. I like to connect the vacuum to a port that HAS vacuum at idle. This way, you get maximum advance at part-throttle, but the vacuum will basically be zero at full-throttle so at that point you work off mechanical advance only.

Careful of pinging (aka: detonation). If you hear it, then back off timing.

Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970
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post #3 of 3 (permalink) Old Nov 23rd, 05, 09:42 AM
DjD
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Re: HELP engine tune up advise needed 67 327

Quote:
Originally Posted by jtmnoxville
I have a bone stock 67 with the 295 hp 327. I boleave this engine hae 11.5:1 compression. Is their any way to play with the timing to get better milage or use low or mid grade gas. What oil should I use if the car has about 113,000? are their any outer economy tricks? I heard headers and an upgraded intake and high flow mufflers increace gas milage.
Thanks,
Jon
Hi Jon,

A stock '67 Camaro 327 would be 275hp and wouldn't be 11.5:1 compression. As for economy tuning you might get away without pinging on lower octane fuel by retarding the timing but you will be loosing performance by doing so. Headers and better exhaust might help some as would an open element air cleaner. The thing is the improvements would be marginal if the engine is tired or out of tune to start with. Your driving style will most likely have the biggest impact unless you already drive like there is a raw egg between your foot and the gas...

...Dennis

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