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Old 11-05-2007, 06:15 AM
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327 Timing/Plug gap questions

I have a 327, bored 30, flat top pistons, 204/214 cam, 300 horse double hump heads, HEI ignition and holley 600.. What should the plug gap be, 35 and how hot of plug, any suggestions on type and number - have been using autolite 145? What should the total timing be? thanks


Last edited by 67ssguy; 11-05-2007 at 01:04 PM.
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Old 11-05-2007, 08:04 AM
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Depends on your ignition source.
1. If still points with the original coil: .035"
2. If HEI: probably about .045"-.055"
With those heads, I would think you should shoot for 36-38 degrees, total advance.
I'm sure other, more informed people will elaborate.
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Old 11-06-2007, 10:17 AM
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Look up the recomended spark plug for the origonal application.
say 1967 327-300hp Impala. NGK makes a good plug for that head.
If you hammer it around town a lot, go 1 to 2 heat ranges cooler.

Assuming the timing marks and timing tab are accurate:
Set the timing with vacuum adv disconnected to 32 to 36 deg BTDC at max advance at high rpm (could be 4000rpm+) with a advance timing light.
Should return to idle at 8 to 14deg at idle. Then reconnect the vacuum advance. You'll probabily need to run premium fuel.
If you want to run regular gas try 28 to 32deg max and keep your foot out of it.
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