Lapping the block and cleaning it before hg replacement.

jdmsoup · 05-19-2010, 07:06 PM

As some of you know im in the middle of putting a new headgasket on my mk3 and i was wondering if anybody had any tips and advice for cleaning the top of the block and giving me a smooth surface for the hg. im using a fel-pro hg with the permatex copper spray that i was recommended. I know a stock headgasket is a little forgiving but i would still like to have a good clean surface. im jsut worried about getting stuff in the holes in the block. so any help would be greatly appreciated. thanks in advance.

batmmannn · 05-21-2010, 05:14 AM

Do search for Head gasket there is a real nice thread from a guy named Andy from New Zealand that goes over the sandpaper block routine for lapping your block.

turbonicsperformance · 05-22-2010, 05:00 AM

Quote:

Originally Posted by jdmsoup

As some of you know im in the middle of putting a new headgasket on my mk3 and i was wondering if anybody had any tips and advice for cleaning the top of the block and giving me a smooth surface for the hg. im using a fel-pro hg with the permatex copper spray that i was recommended. I know a stock headgasket is a little forgiving but i would still like to have a good clean surface. im jsut worried about getting stuff in the holes in the block. so any help would be greatly appreciated. thanks in advance.

i dont like the spray ive seen it cause blown head gaskets it is good for a pitted surface but when it gets around the cylinders it creates uneven points and gives a higher chance of blowing the gasket again gm had a bulletin about it about 2 years ago because techs were using it on the northstar and it would cause a blown gasket

05-19-2010, 07:06 PM	#1
jdmsoup 3" Exhaust Join Date: Apr 2010 Location: upstate south carolina Posts: 70	Lapping the block and cleaning it before hg replacement. As some of you know im in the middle of putting a new headgasket on my mk3 and i was wondering if anybody had any tips and advice for cleaning the top of the block and giving me a smooth surface for the hg. im using a fel-pro hg with the permatex copper spray that i was recommended. I know a stock headgasket is a little forgiving but i would still like to have a good clean surface. im jsut worried about getting stuff in the holes in the block. so any help would be greatly appreciated. thanks in advance. __________________ 87 Supra Turbo. JDM 7M-GTE. CT-26 set @ 10-12 pounds. xs sport manual boost control. hks ssq bov. greddy front mount. 3"downpipe with 3" straight through piping back to tip kyb shocks. "In life its not what you know, its who you know"

05-21-2010, 05:14 AM	#2
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Head Gasket Do search for Head gasket there is a real nice thread from a guy named Andy from New Zealand that goes over the sandpaper block routine for lapping your block. __________________ 1987 N/A 7MGE Left Hand Drive MK3 Red 5 Speed and Black Auto Supras My Next project is the Batmobile!