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Old 12-14-2005, 06:20 PM
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Need help? What plug and gap for SBC?

Completely stock SB from 67-69.
327/350??? Have to pull the pan to check the numbers on the crank.

I just converted from the canister type oil filter to the screw on and now would like to change the plugs for the first time since owning the car. Too my amasment 6 out of 8 plugs were not even finger tight.

There were three different types of plugs sitting in there.

What general plug should I replace them with? What should I gap them at?
Not looking for anything fancy.

ThanX

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Old 12-14-2005, 06:35 PM
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You can get the numbers without pulling the pan. They are located in two places. On a plate ust behind the alt and on the back driver side close to the bell housing. Also, feel down through the harmonic balancer and see if there is a bolt in the end of the crank. If there is it is a good chance it is a 350. 327's did not have a bolt in the crank. I use ac delco plugs (R43 I think) and gap them .035
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Old 12-14-2005, 06:58 PM
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When you have one of the plugs out you can stick a lenght of stiff wire down the hole and measure the stroke. Mark it before and then turn the crank 180. remeasure. 3.25 for the 327 and 3.5 for the 350.
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Old 12-15-2005, 07:34 AM
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I beg to differ, but the 327s did have a crank bolt. You can check your engine numbers at Mortec.com.
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Old 12-15-2005, 10:20 AM
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Quote:
Originally Posted by MI2600
I beg to differ, but the 327s did have a crank bolt. You can check your engine numbers at Mortec.com.
I've given up searchin numbers as, they vary from site to site. One tells me it's from a truck, another verifies that the suffix code is definetly CAR. I was told that if the engine is original that the crank is more difinitive than the other numbers.

More intersted right now in what plug and gap I should be using.

6 of the plugs were AC R45S, so I just got me a set of these but so far just one reply with a .035" gap.
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Old 12-15-2005, 01:36 PM
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.035 is the proper gap for either 327/350.
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Old 12-15-2005, 04:03 PM
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ThanX folks..

I just picked up a set of AC R45S's and I'll recheck the gap to .035"

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Old 12-19-2005, 05:33 AM
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I just changed the plugs in my 350 and switched to NGK plugs. When I bought the plugs I checked the book to get the correct plug and they specified a gap of .045. Is this too much or does it depend on the plug. Can't remember the plug number off hand.

Barry
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