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GMC V6 and V12 Engines Engine repair and rebuilding

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Old February 27th, 2021, 09:19 PM
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AZKen AZKen is offline
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Default 305 Question about valves

Is a 305 an interference motor or not? In other words, if timing chain or gear breaks/stretches will valves hit piston or is there clearance? Some Chevy motors are interference motors and some are not. Don't know if GMC 305 V6 is or not? Thank you.
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Old February 28th, 2021, 11:40 AM
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Default Re: 305 Question about valves

The 305 is a non-interference motor. I have measured the valve clearance on a stock 305 head and a magnum head. On the 305 with a valve lift of approximately .450" (valve wide open) lift it will still have a minimum of .150" clearance (piston at top dead center). On the magnum head with a valve lift of approximately .450" (valve wide open) lift it will still have a minimum of .120" clearance (piston at top dead center). Hope this help.
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Old February 28th, 2021, 09:16 PM
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Default Re: 305 Question about valves

Thank you very much James.
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