I have a n 89 tbi stock top and bottom ends. the question is what do I need to do to change to 1.6 ratio rockers. I'm thinking it's just the rockers and guides, but will I need new springs or any head work.

 

we have no guides. just take the old ones off and put the new ones on. maybe put some oil on them the first time...

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-Tas
'89 Formula WS-6
[soon to have Hooker 1-5/8" 50 state legal headers installed]

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz

 

Will they fit under our stock valve covers?

 

yes

 

the cheaper 1.6 self alighning ones will. The big aluminum full roller rockers might needs some mods to work.

 

I have the big expensive full roller rockers on my L03 and they work fine. Direct bolt up. No other mods needed.

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89 Formula 305 TBI
160* stat, 200* fan switch, K&N, Headers, 3in Flowmaster (hollow cat) back, pullies, 1.6 full roller rockers, B&M trans cooler, home-made ram-air
3.73 Richmond gears and SLP Zexel Torsen Posi (waiting for install)

 

RGZWS6: Did you use the self aligning rockers? What brand are they? What year is your block?
I think it's just the 87-newer blocks that need the S/A rockers, right?

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No guts, no glory.

 

Cylinder heads without guideplates (like the 87+ heads) need self aligning rocker arms.

-Mark W.
'88 SC Camaro w/ 305 TBI