head boltS
- Thread starter supraman508
- Start date
Thanks,just what i wanted to hear.i sanded the block do to old head gadsket residue.along as the block serface is smoth their should'nt be any problems rite?AJ'S 88NA;1017496 said:
Sanding generally is not a good idea. You can sand away small areas more than the surrounding area and now you have a perfectly flat head surface trying to match up with a deck that has gradual changes in height.
Have the deck checked by a straightedge or have a machine shop check it for you.
Have the deck checked by a straightedge or have a machine shop check it for you.
See Senior. A level and some feeler gauges.
If you really take your time and do it that way and do it right.
Wear each sheet of paper before change. Keep it as smooth as possible.
Use figure 8's from the top to the bottom of the block. Back and forth and don't linger in any one spot.
Make sure your sanding block is a few inches longer than you think you want.
That way you don't snag anything and throw your swirl marks off.
Lubricate it well. I used PB Blaster.
When it get's low. Wipe it off and hose it down and sand again.
Don't do any of this without rolling up some towels and sliding them firmly down inside of the cylinder holes.
If you really take your time and do it that way and do it right.
Wear each sheet of paper before change. Keep it as smooth as possible.
Use figure 8's from the top to the bottom of the block. Back and forth and don't linger in any one spot.
Make sure your sanding block is a few inches longer than you think you want.
That way you don't snag anything and throw your swirl marks off.
Lubricate it well. I used PB Blaster.
When it get's low. Wipe it off and hose it down and sand again.
Don't do any of this without rolling up some towels and sliding them firmly down inside of the cylinder holes.
Wow, no. Do not sand the block or the head surfaces. Have them milled at a machine shop. Also, a level is not straight, or flat, if you will. A machinist straight edge is. This is one of those places where being cheap is definitely a BAD idea...
I have a metal work back ground with pratt & whitney.
I don't mean to be rude. But If I can grind welds to match parent metal for apache helicopters and f 18 fighter jets.
I think I can do a reasonable job. I'm pretty anal.
I wouldn't tell everyone to do it.
But if a guy has his mind set to do something.
Heck we may as well help him do that right regardless of how far off base he is.
Next time he'll think to himself...., naw. I'll have it machined.
Chances are it won't be 30k miles later either.
That's all. I didn't mean to upset anyone.
I don't mean to be rude. But If I can grind welds to match parent metal for apache helicopters and f 18 fighter jets.
I think I can do a reasonable job. I'm pretty anal.
I wouldn't tell everyone to do it.
But if a guy has his mind set to do something.
Heck we may as well help him do that right regardless of how far off base he is.
Next time he'll think to himself...., naw. I'll have it machined.
Chances are it won't be 30k miles later either.
That's all. I didn't mean to upset anyone.
Last edited:
i used a 400grain sand paper.but i get the hint.luckly i did'nt use a 40 grain.castrol supra;1017707 said:
i used a 400grain sandpaper.whats going to happen next.automaticly have another blown head in the next 5miles of driving?:wtc:cuel;1017640 said:
I did this process Spread out over 2 weeks.
If you half a$$ it. You could have problems.
This isn't the best way of doing this.
But it can be done. How long will your new hg last?
IDK. Depends on how anal you are and wether or not you rush through it or spend some real time doing it.
Try some 4000 grit.
The block moves so little less than the head does.
In doing this you lock yourself into a big ticket MHG.
And ARP studs.
If you half a$$ it. You could have problems.
This isn't the best way of doing this.
But it can be done. How long will your new hg last?
IDK. Depends on how anal you are and wether or not you rush through it or spend some real time doing it.
Try some 4000 grit.
The block moves so little less than the head does.
In doing this you lock yourself into a big ticket MHG.
And ARP studs.
you're rite.i'll take my time,do it rite.Thanks for your words of wisdom.castrol supra;1018509 said:
Wait a second. As I understand it, (someone please correct me if you KNOW I'm wrong) the problem with sanding the block is that you introduce shallow areas. NOT that it simply isn't smooth enough. In fact the composite head gaskets and copper spray dont mind a bit of "bite" when trying to seal. With the MHG you NEED to get the surfaces VERY, VERY smooth. They have a recommended RA spec and so forth.
I would not sand anymore, no matter how much you "take your time". But hey, I'm no machinist, and I'm no expert. :dunno:
But I do know that there are plenty of people around here that have had another BHG because the surfaces weren't flat enough. I dont want to argue, but I'd say get that head checked by a straightedge or have a machine shop take a look at it before doing anything more to the deck surface.
I would not sand anymore, no matter how much you "take your time". But hey, I'm no machinist, and I'm no expert. :dunno:
But I do know that there are plenty of people around here that have had another BHG because the surfaces weren't flat enough. I dont want to argue, but I'd say get that head checked by a straightedge or have a machine shop take a look at it before doing anything more to the deck surface.
' just sanded it down alittle,not that much.won't sand anymore.taking my head to napa tuesday to get plained and cleaned up.need to have them replace a couple of valves since 2 of them siezed up.suprarx7nut;1018716 said:
supraman508;1019623 said:
Need to make sure they have a real head planer and not just a belt resurface machine. The belt type will never get the head surface smooth enough for a MHG.
That's what my 1 horse town of a machine shop had.
Which was why I did my block as I did,
By the time I found someone with the right machining tools.
It took them over a month to do my head.
So I lapped my own block.
Which was why I did my block as I did,
By the time I found someone with the right machining tools.
It took them over a month to do my head.
So I lapped my own block.