Thread: L67 build questions

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  1. #1 L67 build questions 
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    Hello, I have a completely stock L67. In my Fiero with a 5 speed, and I was walking the junk yard, the other day. When I found a gold mine. It look like some one was building a l67 and never got finished because It was not all together, but it did have brand new CNC zzp cylinder heads, xp cam, push rods, double roller timing chain and Billet fuel rail. So I grabbed it all. But now I'm wondering, If I should go with a bigger cam or modified rockers. Before I put it in.
    Ok my questions Are,

    • would it be worth it to get a bigger cam?
    • would it be better to buy 1.9 rockers

    I know that 1.9 would be a lot of lift like .617/.636 but the the cylinder heads are milled for .600 and modified retainers with valve seals that give, An extra .05. That gives a total of .650. which give a .0135 of Clarence. Is that enough Clarence? The heads have #136 valve springs.
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  2. #2 Re: L67 build questions 
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    And where is this junk yard?

    Sent from my LG-H872 using Tapatalk
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  3. #3 Re: L67 build questions 
    Killa Bee Scottydoggs's Avatar
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    cam is best, xp is as big as your going with out head work really.

    rockers help, but they just mimic the stock cams profile.

    and you run stock rockers on a aftermarket cam, or 1.6 roller rockers if you like rollers. not needed tho.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: L67 build questions 
    GrandPrix Junkie SgtMarshal's Avatar
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    you could add rockers to the XP cam, just need to take measurements and not exceed the limits. you don't have to add 1.9 rockers, you could do 1.7 or 1.8 and maybe not be over the limit.
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  5. #5 Re: L67 build questions 
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    Quote Originally Posted by jesseC651 View Post
    And where is this junk yard?
    LKQ Pick Your Part Savannah. But I got all the parts sorry

    Quote Originally Posted by Scottydoggs View Post
    cam is best, xp is as big as your going with out head work really.

    rockers help, but they just mimic the stock cams profile.

    and you run stock rockers on a aftermarket cam, or 1.6 roller rockers if you like rollers. not needed tho.
    The heads I got are ZZP CNC and a xp. I was just thinking with these heads, maybe go with a bigger cam
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  6. #6 Re: L67 build questions 
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    Quote Originally Posted by SgtMarshal View Post
    you could add rockers to the XP cam, just need to take measurements and not exceed the limits. you don't have to add 1.9 rockers, you could do 1.7 or 1.8 and maybe not be over the limit.
    Intense only sells roller rockers now and ZZP only have 1.65 and 1.9 now
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  7. #7 Re: L67 build questions 
    GrandPrix Junkie SgtMarshal's Avatar
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    so get the yella terra roller rockers...
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  8. #8 Re: L67 build questions 
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    I thought those were proven to give us less power
    Last edited by Jonathan0498; 09-10-2017 at 07:18 PM.
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  9. #9 Re: L67 build questions 
    Killa Bee Scottydoggs's Avatar
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    i got yt 1.95's. they killed off 5ยบ kr when i was still stock and untuned. they do work.

    id still run the cam if its not all torn up. xp cam, go back get the headers if you failed to take them, run them heads and a 3.2 pulley and it will be hard to stop grinning i bet. did you say it had head studs? if so take them too. cause they are way better then stock tty bolts and are re usable.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  10. #10 Re: L67 build questions 
    GrandPrix Junkie SgtMarshal's Avatar
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    I think you are referring to the study zzp did to show the effectiveness of their "ER Rockers" for NA 3800's, which as it turns out is not applicable in supercharged applications. Plenty of people have made good power with roller rockers. you could just keep it simple and use what you have, but add an intercooler instead of a bigger cam and/or rockers.
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  11. #11 Re: L67 build questions 
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    My plans for the build are.
    • Gen v supercharger
    • 2.x-3.2 pulley
    • phenolic intercooler
    • CNC heads with 136# that is what's in them
    • 60 #injector
    • Double roller timing chain
    • stock l62 lower end
    • xp or bigger cam ?

    hoping 350whp through the manual
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  12. #12 Re: L67 build questions 
    Killa Bee Scottydoggs's Avatar
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    be closer to 300-320. but all the same that cars gonna fly. its super light. think another guy here ran a 11 or a 12 with a cam'ed 3800 Fiero. no ic yet for him, and his is a automatic HD with a gear change.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  13. #13 Re: L67 build questions 
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    You might knock off 350~ or so without the slushbox killing it and ethanol.

    You WILL need a 2.6" or so to do it with just a little XP.

    Do headwork and get a big cam. I'd also venture to tell you to find an L36, not a 26. Seems to have a better track record with rotating assembly strength.
    1999 Chevrolet Silverado K1500 Classic Z71 - Intake/Gibson Exhaust/20% Tint
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  14. #14 Re: L67 build questions 
    GXP Level Member coolone's Avatar
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    1.9's are nowhere near the lift you noted. Stock Cam profile is. 278 or. 530 lift with 1.9's. And for power, the Cam is the best way to go. As Scotty mentioned, high ratio rockers will only pronounce the Cam profile, provide sliglty better ram rates and more air in/out. But power will come from the duration and lobe profile, etc. You can go Cam and rockers if done right, I'm running Overkill BBC Cam and 1.8's right now and absolutely love it!

    Just take some time to do the research, these engines have no unicorns and the maps are there for what you may want to build, power, street, track, SC, Turbo, etc. It's all there, no mystery!
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon
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