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#1
04-29-2009, 12:55 AM
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Re: Mystery of the ZL/X
Didn't someone post a scan of an old B/M ad here a while back that listed all the GM P/Ns for the ZL-X? I know I've seen it somewhere.
__________________
Don't mistake education for intelligence. I worked with educated people. I socialize with intelligent people. 
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#2
04-29-2009, 02:12 AM
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Re: Mystery of the ZL/X
Yeah, I know about those #990 heads. There's also the #188 heads. I've seen several of those heads on LS-6 and LS-7 crate motors all the way up into the '90's. I think the 026's, 990's, and 188's are all VERY similar. I'll tell 'ya, I've had some friends go VERY fast on those 990 heads. How about 8.60's in a 10.5 Shootout-style 72 Nova!? That was around 540 inches with a pretty heavy shot of the juice, but still that's really impressive for an old out-dated cast-iron head when everybody says you have to have the latest, greatest most modern aluminum heads to go fast.
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1962 Biscayne O-21669 MKIV/M-22 1962 Bel Air Sport Coupe 409/1,000
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