ZZP series 1 ROLLER ROCKERS 1.8 ratio?! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-19-2006, 12:02 AM   #11
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I have to say. im suprised to see more than ONE vendor with Series one parts
Its a nice change for once I think..
Someone needs to test these
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Old 10-19-2006, 12:44 AM   #12
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Quote:
Wouldn't a vendor like ZZP already HAVE dyno numbers if they advertised a claim like that? I would assume it would be a very simple matter to ask ZZP for the dyno data and get it. Are you speaking for ZZP officially, or do you not believe they have the data?
Its most likely a similar formula to what other vendors use. Its "common knowledge" that rockers below 1.9.1 lift perform better on N/A 3800s. Realistic gains from rockers are about 8-12whp, so take the 20% drivetrain loss (or more), there is ~16-18chp. I would honestly expect gains to be about the same for the */Ced 3800s.

-Jeremiah
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Old 10-19-2006, 08:11 AM   #13
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Someone that'* a series 1 needs to zip and email off and ASK for the data.

Let'* stop speculating.
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Old 10-19-2006, 11:01 AM   #14
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Email sent.
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Old 10-19-2006, 08:25 PM   #15
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Quote:
Originally Posted by willwren
Wouldn't a vendor like ZZP already HAVE dyno numbers if they advertised a claim like that? I would assume it would be a very simple matter to ask ZZP for the dyno data and get it. Are you speaking for ZZP officially, or do you not believe they have the data?

My suggestion to any member here would be to contact ZZP in the interests of this topic, get the data, and post it for the benefit of those interested. After all, this is the bulk of the Series 1 L67 market.
I'm not speaking for ZZP officially because I am not part of ZZPerformance. I have not spoken to Zooomer about these rockers either.

I bet that these are Yella Terra rockers since ZZP worked with Yella Terra to lighten there rockers and create some custom ratios (1.84:1, 1.95:1, etc) for the Series II.

With that being said these look like older Yella Terra rockers which would make ZZP a distributer or the rockers. ZZP being a distributer of the rockers I'm sure that all the data has come from Yella Terra.

ZZPerformance is the only 3800 vendor with an engine dyno but I'm more then willing to bet that these rockers have not seen a dyno or even an engine by ZZP. For the amount of rockers ZZP is going to sell it really doesn't make sense for a company like ZZPerformance to dyno these rockers for themselves.

Just my .02

J. Wikoff keep BC updated to see I'm on track or way off.
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Old 10-20-2006, 12:42 AM   #16
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Quote:
Originally Posted by I
I have a set of Yella Terra 1.72 roller rockers, bought from
seriesoneperformance.com that I have yet to install. Would there be much
advantage to using your 1.8 rockers? Do you have dyno data for these? Do
you make them or who does? Do you have them in 3/8 and 5/16 stud (92 heads
have different rocker bolts than 93-95 L67 and 93-94 L27 3800s)?
Quote:
Originally Posted by ZZP
Ours have 5/16" studs. I believe that is for 93-95 correct?
The pic ZZP has does not look like the YT rockers I have. You'd think the two ratios of rockers would look very similar, but they have different styles.
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Old 10-20-2006, 01:42 AM   #17
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Let me know if I should make another thread...

I have LN3 heads. Would I gain any more HP if I used these rockers on '95 heads with the roller tips versus the LN3 heads? I'm not too knowledgable in valvetrain, but wouldn't the ZZP rockers have the roller tips that the LN3 heads lack, and therefore, it wouldn't matter which I installed them in?
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Old 10-20-2006, 02:12 AM   #18
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Quote:
Originally Posted by F14CRAZY
Let me know if I should make another thread...

I have LN3 heads. Would I gain any more HP if I used these rockers on '95 heads with the roller tips versus the LN3 heads? I'm not too knowledgable in valvetrain, but wouldn't the ZZP rockers have the roller tips that the LN3 heads lack, and therefore, it wouldn't matter which I installed them in?
IIRC The LN3 heads have a different rocker arm stud size?
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Old 10-20-2006, 02:16 AM   #19
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Quote:
Originally Posted by 95naSTA
Quote:
Originally Posted by F14CRAZY
Let me know if I should make another thread...

I have LN3 heads. Would I gain any more HP if I used these rockers on '95 heads with the roller tips versus the LN3 heads? I'm not too knowledgable in valvetrain, but wouldn't the ZZP rockers have the roller tips that the LN3 heads lack, and therefore, it wouldn't matter which I installed them in?
IIRC The LN3 heads have a different rocker arm stud size?
He'* talking about swapping to 93-95 L67 or 93/94 L27 heads first.
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Old 10-20-2006, 02:23 AM   #20
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Would I HAVE to use '95 heads to use the ZZP rockers?
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