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You may need to just get a half inch breaker bar and pipe.
A 1/2 inch impact cant remove all large bolts such as cylinder head and main bolts unless its a 3/4 drive.
I have the same impact gun, it cant remove all stuck nuts and bolts or head bolts even with 120psi driving it.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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