Is there any way to tell whether or not a block is warped with certainty?

[4gfun]

I know that there are DIY ways to tell if a block is warped but was wondering if there is a foolproof DIY way to see if the block is warped.

Please advise.

Thank you

 

[donniekak]

A machinist Straight edge, and a feeler gauge.

 

[5150DSM]

http://www.dsmtuners.com/forums/articles-engine-fuel/341627-how-check-head-warp.html

Doing a block is essentially the same.

 

[4gfun]

Could you please give me a summary of a technique. I have never done this before and since the cars are becoming so hard to find I am considering ones with alleged bad head gaskets.

Thanks

A machinist Straight edge, and a feeler gauge.

 

[DSMnoobsause]

5150dsm just did. Just apply that to the block surface.

 

[4gfun]

That is what I love about this site, responses come in so quickly that you can miss one. Sorry about that and thanks!

 

[northernawd]

should find a machine shop just to quickly look at it. OR you could look up the tolerance for it. straight edge on the block mating surface and feeler guage where it warps. if its out of tolerance your going to need to get it machined at a professional machine shop

 

[4gfun]

The block can be machined? I thought the block would have to be tossed if it is warped? Also, don't want to pull the block to take it to a machine shop or tow it to a machine shop if that makes sense. I am in sort of a rural area.

This is why I want to make sure that the method is fool proof. I'd like to buy a car with a head problem try the method and if the block is warped then so be it.

I'd like to be completely sure the block is straight in my back yard without removing the block.

should find a machine shop just to quickly look at it. OR you could look up the tolerance for it. straight edge on the block mating surface and feeler guage where it warps. if its out of tolerance your going to need to get it machined at a professional machine shop

 

[BogusSVO]

The block can be machined? I thought the block would have to be tossed if it is warped? Also, don't want to pull the block to take it to a machine shop or tow it to a machine shop if that makes sense. I am in sort of a rural area.

This is why I want to make sure that the method is fool proof. I'd like to buy a car with a head problem try the method and if the block is warped then so be it.

I'd like to be completely sure the block is straight in my back yard without removing the block.

WOW! I sure hope the blocks can be decked...... Or I been doing it wrong.. along with a slew of other shops!

http://www.dsmtuners.com/forums/cyl...-deck-4g63-cast-iron-block.html#post152790451


The only "Fool proof" way to make sure your block surface is flat is to have it milled.

Most 4g blocks are distorted on the HG surface at this age in there life, Repeated blown HG, repeated torque applied to the head bolts/studs, improper gasket surface cleaning ect....

The straight edge will let you know if it is close enough to use a composite HG.

http://www.dsmtuners.com/forums/newbie-forum/452489-backyard-straight-edge.html#post153147462

http://www.dsmtuners.com/forums/cyl...correction-machining-belt-surfaced-block.html

http://www.dsmtuners.com/forums/cyl...block-i-have-ever-surfaced.html#post153128223

You must be logged in to view this image or video.

Other threads with questions and pics of block surfaces.

http://www.dsmtuners.com/forums/cylinder-head-short-block/453484-headgasket-question-searched.html

http://www.dsmtuners.com/forums/newbie-forum/448517-composite-mls.html

 

[4gfun]

Lol...funny!

Close enough to use a composite HG is close enough for me. Missioned accomplished.

When you said "4g" did you mean 1g?

Thanks

WOW! I sure hope the blocks can be decked...... Or I been doing it wrong.. along with a slew of other shops!

http://www.dsmtuners.com/forums/cyl...-deck-4g63-cast-iron-block.html#post152790451


The only "Fool proof" way to make sure your block surface is flat is to have it milled.

Most 4g blocks are distorted on the HG surface at this age in there life, Repeated blown HG, repeated torque applied to the head bolts/studs, improper gasket surface cleaning ect....

The straight edge will let you know if it is close enough to use a composite HG.

http://www.dsmtuners.com/forums/newbie-forum/452489-backyard-straight-edge.html#post153147462

http://www.dsmtuners.com/forums/cyl...correction-machining-belt-surfaced-block.html

http://www.dsmtuners.com/forums/cyl...block-i-have-ever-surfaced.html#post153128223

You must be logged in to view this image or video.

Other threads with questions and pics of block surfaces.

http://www.dsmtuners.com/forums/cylinder-head-short-block/453484-headgasket-question-searched.html

http://www.dsmtuners.com/forums/newbie-forum/448517-composite-mls.html

 

[ThunderChild]

"4g" refers to the engine series (4g63, 4g64, 4g61 etc. the engine codes start with 4gXX)

 

[Sebba]

The block can be decked, but there's not a lot left when you consider the minimum deck height specification. Doing so will increase oil pressure, and restrict flow to the head slightly.

 

[BogusSVO]

The block can be decked, but there's not a lot left when you consider the minimum deck height specification. Doing so will increase oil pressure, and restrict flow to the head slightly.

Sebba, you are incorrect on this.

He is dealing with the block, not a head.

The Piston to deck clearance on most block I have checked are .003-.005 with the pistons in the hole.

The oil feed from the block to the head is just a drilled hole.


Decking the block will have zero effect on oil pressure and flow, that is an issue with a trough in the head.

Now when a block is decked, caution has to be used so the pistons will not protrude above the block deck.

 

[ThunderChild]

Sebba, you are incorrect on this.

He is dealing with the block, not a head.

The Piston to deck clearance on most block I have checked are .003-.005 with the pistons in the hole.

The oil feed from the block to the head is just a drilled hole.


Decking the block will have zero effect on oil pressure and flow, that is an issue with a trough in the head.

Now when a block is decked, caution has to be used so the pistons will not protrude above the block deck.

correct on on dsm motors for sure.

ill state once again, that my 7mge(7mgte) supra motor was factory .020 above deck, and after milling is now .024" above deck. all comes down to what motor it is and the specs.

 

[Sebba]

Sebba, you are incorrect on this.

He is dealing with the block, not a head.

The Piston to deck clearance on most block I have checked are .003-.005 with the pistons in the hole.

The oil feed from the block to the head is just a drilled hole.


Decking the block will have zero effect on oil pressure and flow, that is an issue with a trough in the head.

Now when a block is decked, caution has to be used so the pistons will not protrude above the block deck.

My bad!

 

[4gfun]

Thanks all, and makes sense on the 4g. I wasn't thinking that way.