Thread: What are "990" heads???
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Old 04-05-2007, 10:05 PM
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ANDY M ANDY M is offline
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Default Re: What are "990" heads???
mortec.com shows them as 454 service replacement heads, but they have the same chamber as the 074 alum heads.
I have a pair on my car, and they are stamped "L88" on the side.

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