ZZP series 1 ROLLER ROCKERS 1.8 ratio?! - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 10-20-2006, 02:53 AM   #21
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93-95 L67 or 93/94 L27 heads as I stated above.

ZZP may be unaware of the 92 head differences. Or theirs are for 92 and not the other years?
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Old 10-20-2006, 10:07 AM   #22
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my bad
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Old 10-20-2006, 10:35 AM   #23
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They have 5/16, which they think is 93-95, but I can't remember which it is.
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Old 10-20-2006, 12:35 PM   #24
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So, would the problem with using the ZZP rockers on earlier heads be that the mounting studs are the wrong size? Can this be worked around?
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Old 10-20-2006, 02:05 PM   #25
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Quote:
Originally Posted by J Wikoff
They have 5/16, which they think is 93-95, but I can't remember which it is.
The 93-95 L27'* and L67'* will have the 5/16 bolt

88-92 used the larger bolts

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Old 10-20-2006, 03:15 PM   #26
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Can the rockers be drilled out? Can the studs be replaced?
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Old 10-20-2006, 05:23 PM   #27
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Well, I'm sure theres a minor gain 5-10HP from the rockers having rollers on them, but maybe a little more HP and I'll get them.
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Old 10-21-2006, 01:12 AM   #28
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Don't forget in addition to the roller tips, they are lighter and have a higher ratio.
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Old 10-21-2006, 11:36 AM   #29
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Keep in mind, the L27 and L67 starting in 93 had roller fulcrum. This was maybe only a 5hp gain over the 92 L67 and L27. The gain is from the ratio itself. Even the roller tip won't gain any amount of horsepower you could characterize or claim.
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Old 10-21-2006, 10:50 PM   #30
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Quote:
Even the roller tip won't gain any amount of horsepower you could characterize or claim.

I gained 2whp for going to roller tips on 130lb springs. NO other changes! And another 11whp moving to 1.7 rr'*.
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