Deposit on top of pistons - The 1947 - Present Chevrolet & GMC Truck Message Board Network

tx5117 · 04-01-2003, 10:45 PM

OK, been a lurker for a while and now have a question. Q'jet cratered on my 72 Blazer. Put a new kit in it and got a wild hair and decided to rebuild top end of engine. Blazer is a dog and needs a lot of work, shocker...huh? Painted the valve covers and pulled the heads to take to a machine shop. Noticed a black deposit on top of the pistons. Deposit is gummy but not to thick. Doesn't cover entire top of piston. Cylinder walls look good. Should I be concerned with the deposit on the pistons and what do I use to clean it off. Don't want to srew it up more. Thanks.

04-01-2003, 10:45 PM	#1
tx5117 Registered User Join Date: Apr 2003 Posts: 6	Deposit on top of pistons OK, been a lurker for a while and now have a question. Q'jet cratered on my 72 Blazer. Put a new kit in it and got a wild hair and decided to rebuild top end of engine. Blazer is a dog and needs a lot of work, shocker...huh? Painted the valve covers and pulled the heads to take to a machine shop. Noticed a black deposit on top of the pistons. Deposit is gummy but not to thick. Doesn't cover entire top of piston. Cylinder walls look good. Should I be concerned with the deposit on the pistons and what do I use to clean it off. Don't want to srew it up more. Thanks.

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