NOS head gasket thickness? Part Num 3993890 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

davepl · 05-04-2012, 05:20 PM

For my '70 402 we were unable to find a currently offered steel shim head gasket, and so wound up with a 0.040 composition gasket. I'm worried about my quench area, as I have about 0.020 of deck height.

I've located a pair of the original gaskets, part number 3993890, but I cannot find any info on what the compressed height of this gasket is. The parts book doesn't tell me.

Anyone have a reference that tells them what the compressed height of 3993890 winds up being?

Thanks,
Dave

05-04-2012, 05:20 PM	#1
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	NOS head gasket thickness? Part Num 3993890 For my '70 402 we were unable to find a currently offered steel shim head gasket, and so wound up with a 0.040 composition gasket. I'm worried about my quench area, as I have about 0.020 of deck height. I've located a pair of the original gaskets, part number 3993890, but I cannot find any info on what the compressed height of this gasket is. The parts book doesn't tell me. Anyone have a reference that tells them what the compressed height of 3993890 winds up being? Thanks, Dave __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

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