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Thread: 1.6 Roller Rockers good for any power?

  1. #1
    Senior Member 94Z71350's Avatar
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    1.6 Roller Rockers good for any power?

    Over the stock non-roller 1.5 ratio ones? Looking for a couple more ponies, truck is a 94 Z71 TBI 350 with a CAI & True dual flowmaster exhaust, also plan on adding a chip from TBIChips.com soon too.
    I was looking at these https://shop.enginekits.com/osb/itemdetails.cfm?ID=3087 and was wondering if they would work or not.
    DD -1994 Z71 350 TBI, Blue and White. GM crate motor with 43k miles, drivetrain has 204k miles.

    Toy - 2000 Corvette H/C/I/E ~540 HP

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    I am thinking these may be more inteded for the Vortec 350 SFI motor with an aftermarket cam 94Z. And probably a pretty big cam too being they are long slot, or possibly just to get the 1.6 ratio too. Of course its just going to give the valve a hair more lift is all its going to do. Maybe one our fearless leaders, Mudseeker, who is more fluent in SBC SFI will have more accurate info to add.
    85 Sierra Classic K1500
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    Senior Member gmctrucks's Avatar
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    I know one just can't put them on without doing other head work.
    http://i961.photobucket.com/albums/ae98/falken86/dadnew-1.jpg

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    welcome to the forum

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    Senior Member bubbatrucklover's Avatar
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    Quote Originally Posted by gmctrucks View Post
    I know one just can't put them on without doing other head work.
    Such as? Just askin' not being a Smart A$$.
    Siggy by Crimson Dragon >>>>>>>>>>>>>>>

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    Senior Member 94Z71350's Avatar
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    Quote Originally Posted by bubbatrucklover View Post
    Such as? Just askin' not being a Smart A$$.
    What about 1.5 roller rockers, self-adjusting. I would think they would be a direct bolt on, no?
    DD -1994 Z71 350 TBI, Blue and White. GM crate motor with 43k miles, drivetrain has 204k miles.

    Toy - 2000 Corvette H/C/I/E ~540 HP

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    roller rockers on a flat tappet cam? you'll be lucky to see 1 hp gain. rockers would be the last thing on the list for upgrades. there are other items that will give you a better hp to $ ratio, such as a cam.

    as hotrod said, you'll get a hair more lift with the 1.6, but you can get more lift for just a little more $ with a cam. i bet i could find you a good cam for another $75, but that would require an almost complete engine tear down.
    <----just your average 5.3

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    Quote Originally Posted by mudseeker View Post
    roller rockers on a flat tappet cam? you'll be lucky to see 1 hp gain. rockers would be the last thing on the list for upgrades. there are other items that will give you a better hp to $ ratio, such as a cam.

    as hotrod said, you'll get a hair more lift with the 1.6, but you can get more lift for just a little more $ with a cam. i bet i could find you a good cam for another $75, but that would require an almost complete engine tear down.
    Exactly what I was thinkin, but figured Mud would be the more experienced in this area.
    85 Sierra Classic K1500
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    84 Silverado C20

  9. #9
    Senior Member gmctrucks's Avatar
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    Quote Originally Posted by bubbatrucklover View Post
    Such as? Just askin' not being a Smart A$$.
    I have heard that one has to do work on the heads or the holes where the push rods go. Like I said I have heard that on another forum. I'm going to see if I can find the post.
    http://i961.photobucket.com/albums/ae98/falken86/dadnew-1.jpg

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    when changing rockers to larger size you need to be wary of valve geometry.especially with roller rockers. as far as making pushrod holes bigger, you would then have to install guide plates. unless you are running a lot of rpms you really dont need larger pushrod holes. larger holes let your oil return faster to oil pan so you dont pump it dry at higher rpms.

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