Knocking/Pinging 68/327 - Team Camaro Tech
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post #1 of 4 (permalink) Old Aug 10th, 01, 07:28 AM Thread Starter
Join Date: Jul 2001
Location: Riverside, CA, USA
Posts: 6

Got my rebuilt 327 2bbl (10:1, mild cam) installed in my 68 and finally got it to fire up. It's quite an amazing feat for me, seeing as how I am not a mechanic, and I have never done such a thing. Anyway, the fuel tank had been nearly empty and sitting for about three years, so I added about two gallons of 91 octane Texaco with a whole bottle of octane booster.
I let the engine run three times for about 20 minutes each time to begin the break in.
At the end of the third time, I noticed a ticking sound coming from beneath the valve covers, somewhere in the engine. I decided to move the distributor back some, thinking that there was too much advance, but this gave no avail. This ticking now hounds me each time I start the car! The gas is really high octane, but could it be that the old gas mixed in and runied it? I haven't yet re-torqued the heads, could that be the problem? What things cause a knock/ping on a brand new rebuilt engine? Any advice would be swell. Thanks in advance.
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post #2 of 4 (permalink) Old Aug 10th, 01, 07:46 AM
Join Date: May 2001
Posts: 84

I think that I would check your rocker/lifter adjustments. Maybe after having run the engine they need to be readjusted.

'69Z 23,000 orig. miles
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post #3 of 4 (permalink) Old Aug 10th, 01, 05:37 PM
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Location: Atco Raceway
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make sure the rockers are at zero lash + 1/2-full turn. 10:1 requires pretty high octane in iron heads, are you sure that the gas is mixed well with the octane booster, did you mix it before putting it in the tank, if not then you might have the 91 getting in their without the booster. 91 alone is too low for 10:1, i'd say at LEAST 94.
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post #4 of 4 (permalink) Old Aug 10th, 01, 06:23 PM
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Join Date: Jul 2001
Location: Toney, AL United States
Posts: 166

If the gas tank has been sitting for three years nearly empty, the smart thing to do was to removed it and had it cleaned. Most radiator shops will vat and clean or possibly coat the tank. It's amazing how a couple of gallons of stale gas can manage to "linger" around in the tank even after adding many gallons of fresh. I've never had the need to re-tourque the head bolts after the initial build. I guess it depends on the use of cheap head gaskets. I've never had a problem with failure. Of course i'm a firm believer in coating the gaskets with K&W Copper Coat before assembly. The ticking is probably from a misadjusted rocker arm. That would be an easy least case senario. If thats all good it could be early signs of something going south down below. Hard to determine without hearing it. I doubt it has to do with the octane of the gas although it's a possibility. Ignition timing could play a big role in an acceleration ping along with fuel octane. If you can hear it at idle, it's probably the rockers.
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