1990 L98 valve guides

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May 2, 2009 | 06:01 PM

cash's90

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From: Yucaipa CA

1990 L98 valve guides

Who stocks valve guides for L98 alum heads?

May 2, 2009 | 06:06 PM

Pete K

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Quote:

Originally Posted by cash's90

Who stocks valve guides for L98 alum heads?

It is typical to leave the cast iron factory guides in place, and machine them for bronze liners. Nearly every local machine shop stocks hundreds of them.

May 2, 2009 | 06:19 PM

ChrisWhewell

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From: Austin Texas

Quote:

Originally Posted by Pete K

It is typical to leave the cast iron factory guides in place, and machine them for bronze liners. Nearly every local machine shop stocks hundreds of them.

The k-line inserts. Good if done right, but make sure the machinst has the broach for the clearance you want.

I've got a set of Cal-Valves 0.008 oversized stemmed valves. For one set of the heads I'm doing, I reamed the guides out to 0.3510. That allows running stock iron guides. Less heat exchange and more friction than bronze but more longevity. Always a tradeoff.

I'd pop out the iron guides, but my oven isn't large enough to fit the heads.

May 2, 2009 | 06:23 PM

Pete K

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I stopped pressing iron guides out of aluminum heads. Last couple of times the new guides would not fit. Then I had to order custom Brodix Bronze guides, at a rediculous price.

May 2, 2009 | 06:33 PM

ChrisWhewell

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From: Austin Texas

Quote:

Originally Posted by Pete K

I stopped pressing iron guides out of aluminum heads. Last couple of times the new guides would not fit. Then I had to order custom Brodix Bronze guides, at a rediculous price.

Yeah, I'd like to find a source for Brodix, a liquidation sale perhaps. If you run across one let me know and I'll do the same. My preference is new bronze guides and proper geometry incluidng roller rockers. I'm still amazed at my 92 chev 350 truck at 270k all stock still running strong burning no oil and passing emissions tests with orginal stock cat still on it. Maybe the emissions tests are just a scam.