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Not a 370z, but... VQ35HR ST (VSR) Begins

Originally Posted by 1slow370 leaving that surface won't blow the engine per say it just makes the HG more likely to fail prematurely Edit: The other companies that build these

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Old 10-13-2014, 09:48 PM   #1 (permalink)
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Originally Posted by 1slow370 View Post
leaving that surface won't blow the engine per say it just makes the HG more likely to fail prematurely

Edit: The other companies that build these motors (GTM, IPP, Jtran) all deck the blocks to a new finish.
some machine shops will NOT deck a block unless you request it or they have to, its removing material. you do not need to deck a block to get proper head gasket seal
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Old 10-14-2014, 05:40 AM   #2 (permalink)
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So true on having that stuff done right. Once you get that girl back in the car and start putting the power to her. The small stuff starts to rear its ugly head.
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Old 10-14-2014, 11:34 AM   #3 (permalink)
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Originally Posted by esfourteen View Post
some machine shops will NOT deck a block unless you request it or they have to, its removing material. you do not need to deck a block to get proper head gasket seal
It all depends on the head gasket and they way it was removed, and the intended use of the motor. MlS gaskets need a smooth finish to seal right, the best way to do this is to take .005-.01 off the deck just enough to cut the corrosion from the coolant and the old imbeded gasket off and ensure a flat deck, this is more important on a FI build (which is probably why the other shops that build these motors do it). If you intend to not deck the block, no power tools should be used to remove the old gasket, it should be done with a fine razor scrapper without scratching the head, and the remaining traces should be scrubbed off with a rag and gasket remover or brake cleaner. After which the block should be checked for flatness, using a scotchbrite wheel on an air grinder is going to scratch the deck and leave areas where the gasket will not seal right.
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