Small Crack In Freshly Rebuilt Block

[aaron1259]

Just got my block back from my engine builder, who said when he took the block, it was fine to use. He also said he pressure tested the block, however after closer inspection I noticed a small crack between the water jacket and the head bolt, is this block toast? Will it affect proper torquing of the head?

[tridentt150v]

I wouldn't use it like that, its not worth the hassle - you know you will always doubt it!!! Every stutter, lurch, or engine stall will have your heart jumping. Plus the crack is only going to grow over time.

[Hadouken]

Take it back to builder

[JDM33R]

Had the same problem when i had mine built, ended up going ahead with the build dispite the crack. 50,000km on 18psi and still going strong. You wouldnt expect a 20yr old block to be perfect right??? Im not saying do it, but i havent had a problem... yet

Edited January 31, 2016 by JDM33R

[Ben C34]

That would have been there since the block was cast.

I wouldn't worry about it.

[YLD-CHLD]

depends which headstud its around.

Was told by an engineer that it was caused by heat fatigue.DON'T quote me on that.

Had a block that had the same cracks on the exhaust side (hot) & it will cause oil to get into the water,as the crack will eventually,if not already meet the headstud then the oil that is around the headstud will get into water gallery,& slightly water into oil.

And if your wondering why there is oil around the headstud look down the headstud holes in the cylinder head & you will see the oil transfer holes for the exhaust camshaft oiling.

If using the block I would highly recommend using headstud sealer on the headstuds that have the oil holes in them,can't remember from memory what they are but pretty sure they are next to cylinder 2 & maybe 5.will check up on that.

all the best with it.

[iruvyouskyrine]

I wouldn't use it. But I have absolutely zero experience with this stuff. Just feels wrong to me.

[aaron1259]

Showed my engine builder, he said he noticed it but the tests came up perfect and told me it has most likely been there since the block was cast and it's fine to use, so fingers crossed Cheers guys