Is the block surface clean enough?
Looks like you've got a tad more cleaning to do. I see some material left here and there. I would also bring each piston up to TDC and clean them. Would be a shame not to while the heads are off, and remove that carbon deposit.
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It's tough to remove the composite gasket material with a scraper sometimes, but like mentioned earlier, it comes off pretty easily with brake clener and a scotchbrite pad. I found a bag of the blue scotchbrites which are supposedly 'scratch free' that I use to clean some areas of the underhood and undercarriage with good success.













