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only cut off as much as is needed to get a clean, flat surface, for the new head gasket.
there is no point cutting more than that.
the potential "compression bump" is so minimal that you will not be able to feel or measure any difference, aside from the better power a freshened head gives you regardless.
only cut off as much as is needed to get a clean, flat surface, for the new head gasket.
there is no point cutting more than that.
the potential "compression bump" is so minimal that you will not be able to feel or measure any difference, aside from the better power a freshened head gives you regardless.
They didn't end up cutting it at all, turns out my "straight edge" is out of plane to the tune of ~.004" because I thought the head was warped. The shop said it was flat and did not need to be skimmed. The head is back on the car now, I have torqued it up to 37 ft-lbs and will do the final 66 ft-lb torque in the morning.
The oil cooler is back on, the AOS has been replaced, and the fuel lines have been replaced as well. What remains is installing the cam tower, timing the motor, routing the vacuum lines, installing the intake and fuel rail, and putting the radiator and fans back essentially. I'm hoping I will hear it run tomorrow.
And Voith I have no idea what chemical bath they used but its 10x cleaner than I expected considering how unserviceably filthy it was before. The shop did a good job for the right price, so they're getting my repeat business. I'm taking my 951 head down to be rebuilt and have 49mm (+4mm oversize) intake valves installed in the next 2 or 3 weeks.
They said it'd be the same 140 dollar price to install new guides and install the 49mm valves + valve job so time to jump on that.
And Voith I have no idea what chemical bath they used but its 10x cleaner than I expected considering how unserviceably filthy it was before. The shop did a good job for the right price, so they're getting my repeat business. I'm taking my 951 head down to be rebuilt and have 49mm (+4mm oversize) intake valves installed in the next 2 or 3 weeks.
Please ask them what is in that tank. I am washing my block with quite extreme treatments and pressure washer set to 200bar @ 160°C and am getting no way near that result..
My method does wonders to interior of the head or block but the outside is another story completely.
Dear Voith: most of the chemical treatments use caustic soda (sodium hydroxide) on iron blocks. My guy uses a dilute solution of this. They may have beadblasted the head as well. That's the only way that I know of to get it that clean. After the beadblasting, they blow out the passages with air or use a solvent bath to clean out all the beads. Sometimes shops use bicarbonate of soda instead of beads, which will wash out with water and is biodegradeable. Hope this helps some.
01-13-2016, 10:09 AM
