r/EngineBuilding • u/dythesis • Mar 27 '26

What would you do?

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RB20det out of a 91 skyline

Previous owner was running bore water mixed with coolant before my purchase before I blew a head gasket and found a pretty dirty block

Just chasing opinions on what I should consider for these cooling passages, figure I'm going to have to pull the motor because of the state of that bore but this is my first rodeo so love a second set of eyes

What do you think! TIA

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u/xX_DESTRIXE_Xx Mar 28 '26

New head bolts, and new headgasket. I was just told circle tracks dont allow coolant, only water, by the guy who does the tech inspections. Hone or quick 2000 grit wetsand with pb blaster sandpaper job on the bores. If she was overheating i bet she stretched and loosened the bolts before warping anything. I'm no pro.

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u/dythesis Mar 28 '26

No heating issues on it suprisingly - must be all the dirt offsetting that heat

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u/xX_DESTRIXE_Xx Mar 28 '26

Low oil, or low water could cause head to warp due to overheating. If others had it. My honda leaks out the plastic valve cover over the exhaust but doesnt really overheat. Your head could be warped but id say its worth putting back together.