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My brother is right. get the trd head gasket to reduce any unneccessayr work and cost in the future. What the trd headgasket does is increase compression due to the thin-ness of it. However, your headgasket is only as effective as the rest of the components in the car. great, you might have a trd head gasket, but you need piston rings, its useless. thats, why you should do all the work while you have the chance to.
While the head is off, i would do all the work on it now -- meaning get the deck shaved, port and polish if you want and work the vlave train. it will be a waste of time and money if you want to do these things and don't do them while the head is off the block.
Nick
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