Warped head or block?

[ezspooling]

My head or block maybe warped on my 6bolt. When I send my motor off for a rebuild at the machine shop can they fix this or willI have to replace it?

 

[jcarmichael]

depending on how bad off it is, it can usually be fixed as long as it is still going to be with in specs. however even if you get the block decked and the head milled down.and they are perfect I would still use a composite head gasket not a metal one as it forms better to any imperfections where a metal one won't. Have them check them out before they actually do the work to them so if its not warped you don't have to pay for something unneeded.

 

[crash89]

They can have the block "decked". This will shave off the parts of the top that could be high spots. I believe its best you dont go beyond a certain amount though, someone correct me if I am wrong.

Im pretty sure the same can be done to the head but it could be easier to find another one..

 

[bryanwheat]

IF the head is warped don't just have it surfaced, most times the cam bores will be out of alignment when the head warps. To properly fix it the head will need to be heated and re straightened than surfaced.

 

[ezspooling]

I was planning on decking it but I'm worried about weakening it. Like on a dirt bike for instance when I had a warped head off a kx450f come in a had sent it off to the machine shop and went to put it back on but our head technician stopped me and said to order a new one because "decking" weakens the metal? Now idk how true this is and if it is true for car motors but it is a thought in the back if my head ya know?

 

[jcarmichael]

I was planning on decking it but I'm worried about weakening it. Like on a dirt bike for instance when I had a warped head off a kx450f come in a had sent it off to the machine shop and went to put it back on but our head technician stopped me and said to order a new one because "decking" weakens the metal? Now idk how true this is and if it is true for car motors but it is a thought in the back if my head ya know?

I am sure structurally it does change some aspects of the block but if it has to be done it has to be done. I doubt it is going to hurt the engine in such a way that you would notice it. just shaves a tiny stip off of the top to make it completely flat again. If you get a good machinist that actually knows what the specs of the block should be he will tell you if its going to be worth it and in tolerance still or if you are just going to need a new block.

ask around your area if you know car people and see where they take there engines to, when you hear the same name enough times thats usually a good trust worthy place to go to.

hope that helps

 

[ezspooling]

I am sure structurally it does change some aspects of the block but if it has to be done it has to be done. I doubt it is going to hurt the engine in such a way that you would notice it. just shaves a tiny stip off of the top to make it completely flat again. If you get a good machinist that actually knows what the specs of the block should be he will tell you if its going to be worth it and in tolerance still or if you are just going to need a new block.

ask around your area if you know car people and see where they take there engines to, when you hear the same name enough times thats usually a good trust worthy place to go to.

hope that helps

This does help thank you. I've been in contact with a good guy named red from hunter machine in salt lake city. I will talk with him about it tomorrow as well. But I had just thought about this possible..hiccup, and thought I would ask you guys here at tuners as well! Lol

 

[jcarmichael]

If you do get it decked try to get specific numbers from him, then head gasket wise you can get a cometic as they sell different height head gaskets, this way you can keep your compression at the same ratio.

also if you really want the best opinion you can get on the matter, message member BogusSVO

he is an actual machinist thats on these forums, he can probably give you any answer you need to do with our motors.

 

[ezspooling]

If you do get it decked try to get specific numbers from him, then head gasket wise you can get a cometic as they sell different height head gaskets, this way you can keep your compression at the same ratio.

also if you really want the best opinion you can get on the matter, message member BogusSVO

he is an actual machinist thats on these forums, he can probably give you any answer you need to do with our motors.

Thanks! I will send him a pm and get this ball rolling!

 

[crash89]

With the amount that is actually trimmed off I highly doubt it weakens it.. Now, boring the cylinder is a different story. Once you get to .060" or so maybe even .040" the walls are getting pretty thin in 4 cyl cars.

 

[ezspooling]

With the amount that is actually trimmed off I highly doubt it weakens it.. Now, boring the cylinder is a different story. Once you get to .060" or so maybe even .040" the walls are getting pretty thin in 4 cyl cars.

Agreed on boring. .20 is plenty

 

[jcarmichael]

Agreed on boring. .20 is plenty

yea I actually had my block at the machine shop this week the machinist called me and said my block was already too bored for my .020 pistons, still got the crank and mains out of it so not a bad deal for a 50 dollar block a friend down here is going to give me his 6 bolt block for free so try it all over again.

but yea I wouldn't go to .040 unless there was no other option, I would much rather get .020 pistons and have to find a block to work then get .040 pistons and bore a block to fit them. blocks are alot cheaper to come by.

 

[Justin_l_]

yea I actually had my block at the machine shop this week the machinist called me and said my block was already too bored for my .020 pistons, still got the crank and mains out of it so not a bad deal for a 50 dollar block a friend down here is going to give me his 6 bolt block for free so try it all over again.

but yea I wouldn't go to .040 unless there was no other option, I would much rather get .020 pistons and have to find a block to work then get .040 pistons and bore a block to fit them. blocks are alot cheaper to come by.

A machinist bores the block to the pistons. IE- Your order pistons, give them to the machine shop, then they bore the block to the size of the pistons.

 

[ezspooling]

yea I actually had my block at the machine shop this week the machinist called me and said my block was already too bored for my .020 pistons, still got the crank and mains out of it so not a bad deal for a 50 dollar block a friend down here is going to give me his 6 bolt block for free so try it all over again.

but yea I wouldn't go to .040 unless there was no other option, I would much rather get .020 pistons and have to find a block to work then get .040 pistons and bore a block to fit them. blocks are alot cheaper to come by.

Right on man! Can't beat free! Lol. I got this car for next to nothing. It's a 92 gsx with 150k miles and all STOCK! Picked it up for 1k

 

[jcarmichael]

A machinist bores the block to the pistons. IE- Your order pistons, give them to the machine shop, then they bore the block to the size of the pistons.

yea I realize that unless you get a 20 yr old n/t block and the guy tried to make it a turbo block without doing his research and messed up the bore and clearance... most 20 yr old blocks aren't going to be at a stock bore anymore just from wear and tear. the block I got was further out then .5 mm obviously.


but yea 1k for a running car is a deal exspecially a stock one, I paid 2k for mine looked like it had seen some rough yrs of sitting because it only had 83,000 miles when I got it a yr ago. up to 97,000 now