what's up guys today we're working on this mitsubishi 4g63 six volt cylinder head
it's a factory virgin stock head just to take off um we're gonna bust this thing apart assess it and
if everything looks good we're gonna turn it into one of our gnarly heads which is like a max effort
six volt deal uh big horsepower talking 1500 plus capable four-cylinder stuff
so i'm gonna get this thing tore down check it out
ah
all right so this thing's already looking a bit better than it did before but definitely not
a hundred percent obviously far from it uh but we got it all apart so far the only thing i see
as an issue is a broken off exhaust stud in the other exhaust that i still haven't gotten out so
i'm gonna stick this thing in the hot tank i wanted to show you guys a good
before it goes in the hot tank and then after
uh yeah this thing's pretty cool it's uh it does a really good job without uh any kind of blasting
um it's not as good as say a soda blaster but uh yeah anyway you'll see check it out take a look
all right guys it's the next day i let this thing sit overnight this head bolt
head stud i soaked it in oil and let it sit both of these actually
it's already broke off and then this other one i'm gonna get them high i want to get
this stuff fixed before we move on to the next step of this which is actually prepping
the deck and welding the decks the first thing i do before we do all our machining processes
so i'm going to get this thing cherry hot again let it cool off maybe shock it with some oil just
try to get this sucker to move worst case scenario i'll have to cut it off and then drill it or break
it off and drill it or whatever it's going to be kind of a challenge but we're going to get it done
all right so getting these head studs out turned into a pain as you can see i couldn't get it
out that way tried heating it up with a torch multiple times letting it sit with oil on it
ended up cutting the sud off which felt wrong at the times i have less to grab onto but i did that
in order to tig weld this nut to the top of it and when you tickled the nut to it it just puts
way more heat in the cylinder head i was able to work it out with the wrench then which was
pretty awesome uh the other one however was broke off below the deck someone else had tried to drill
it out at one point and failed miserably they walked the drill bit on the surface and stuff so
i tried to take welding up to that a couple times couldn't get it out so
this was the process i basically drilled it out milled it out with an end mill because
the hole was so messed up i couldn't actually just drill the stud out and then i cut a old
exhaust manifold up to use as a guide i ended up putting a 7 16 20 bolt or 7 16 14 bolt in it and
then cutting that bolt off milling that bolt head flat to the deck surface and then using
that exhaust manifold that i cut up as a template putting an 8 125 bolt like drilled and tap that 7
16 bolt for an 8 125 bolt and that's what we fixed the flange with yes it was a huge pain
but kind of needed to do it obviously to fix to save this head these things are 40 years old it's
really hard to find them in perfect condition anymore so it was a task but we made it happen
ah
all right so dirty all around it but got that hole fixed obviously there's that hole there
from wherever the previous person was that kind of walked the drill bit over but nothing we're
concerned about because this is all the gasket ceiling area down here anyway so it will not be a
problem but yeah gotta helicoil the rest of these and then move on to the next step with this thing
all right it fought us but we're here right so on to the next step guys
i'm gonna start grinding on the deck of this thing and uh yeah get prepped to weld it
so
this process is called dry decking if you want to learn more about that i'll put a link in the
description for a video i've done previously and it explains why and more about the process
all right now that we've got everything welded i'm going to leave that head in the oven overnight so
i'm going to call that the end of this video so look out for the next one in the meantime
check out this video about the basic porting of a 4g we do it's kind of a boarding overview that
we've done and see what you think of that and look for the next one to come out we'll move
the guide heights in the next video get those set probably start working on the valve job get that
stuff done and move on to porting the cylinder head is going to be the next type of stuff we do