Matt89

I would like to upgrade to 1.6 rockers on my
'89 Formula 350. I heard that the stock valve
covers might not work with these rockers.They might hit the covers. Any suggestions on what I should do. I heard that Crane makes a rocker that will work with no mods, is that true?
Thanks in advance!

CamaroMike

Go to your Chevy dealer and order 1.6 roller rockers for a ZZ4. They will clear centerbolt valve covers and are self aligning. Got em on my ZZ4 and love em!

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84 Camaro ZZ4 with HOT cam. 1.88 60' (12.98 @ 105MPH E.T.)
Other Mods: You name it and I have probably changed it.

2001 Dodge Ram Quad Cab 5.9L 4*2

ASE Certified Auto Tech
LIVE AND DIE BY THE ALMIGHTY BOWTIE!

theformula

You can use your stock valve covers. I even left the baffles in mine. Cranes 1.6's will fit with no modification needed to the heads or valve covers.

Get your 1.6's rollers from paceparts.com. They're only $280...

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91 Formula
305 TPI 5speed
1LE/G92/WS6
Cold air ind. w/K&N, SLP airfoil, ported/polished plenum, March pulleys, TB coolant bypass,Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires, fastchip, Bosch O2sensor, SLP headers & catback,short shifter,3:73s w/Auburn posi,160* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

[This message has been edited by theformula (edited January 23, 2001).]

ScreamingChicken

CompCams Pro-Magnum. cheaper than the crane crap and all aluminum FULL roller

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96 Formula, FOR SALE

87 2.8L of Terror, Firebird. i'm playin with it.

99 Honda CBR 600 F4. it's slow.

theformula

Screamingchicken: What in God's name are you talking about? the Crane rollers I have are all aluminum , full roller. They are the gold extruded race rockers. The paceparts.com I recommended are the same. Actually I believe they are Crane.

Mine are $300 new. If I remember correctly, the Comp ones I were looking at (1.6 self aligning centerbolt chromemoly) were $364 from summit.



[This message has been edited by theformula (edited January 23, 2001).]

JoelOl75

If you have cast iron heads make sure to check the pushrod to "guideplate" hole. 1.6 ratio moves the pushrod closer to the valve and it might interfere. Also if the cam isn't stock make sure to check retainer to valveguide clearance. Forget coilbind.

I found this out the hard way. I was wondering why my rockers were noisy. I gave them the 1/2 turn... Hmmm... then there loose. Retighten. Over&over... Here it was yanking the pressed in rockerstuds out. Amazingly no carnage in the process.

I tapped the stud holes after flushing out the antifreeze from the oilpan (suprises lurk behind the exh. studs) and luckily with stiffer springs installed +.050" with shorter retainers i got away without taking the heads off for machining the valveguides down. It was a learning exp. And think.. It's only a ZZ4 cam with STOCK 1.5 roller rockers and I had all these problems...

[This message has been edited by JoelOl75 (edited January 23, 2001).]

Dan87IROC-Z

My car came with the 1.52 roller rocker arms from comp cams and they have no problems under the valve covers, so I am sure the 1.6s work the same way!

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Gutted Catalytic Converter, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, Ported TPI Plenum and Base, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

doc

I installed 1.6 ratio roller tip rockers froc Crane last year. They interfered with my center bolt vavle covers. Went back to Summit and exchanged them for 1.6 ratio roller tip rockers from CompCams. No problem with these rocker arms.

The Crane rockers are a little bigger than the CompCams rockers, both were 1.6 ratio.

The CompCams rockers are much more sturdy than the Cranes and should have less deformation. If you looked at the two types side by side, you would understand what I said.

These are steel stamped roller tip rocker arms and sell for about $140 at Summit Racing.



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'87 L98 TPI IROCZ, AFR190 heads, 3.70 gears, ZZ9 cam, 2400 Art Carr TC, SLP 1 3/4" headers, SLP cat-back, no cat, no AC, no MAF screens, Accel manifold base & SuperRam, Edelbrock double roller timing chain, MSD ext coil & distributor, trans cooler, 52mm TB with airfoil, TB coolant bypass, AFPR(58psi), K&N filters, Hotchkis lowering springs, Car-Pro custom chip, Lay Ind. ram air kit, 265/45R16 Kumho V700 tires.
ET 13.39sec @ 107.21mph
'90 Eagle Talon AWD, no rust thru 9 winters
'99 Camaro SS, red, 6-spd, T-tops, Mcleod clutch, Pro 5.0 shifter, MAF processor, Direct Flow airlid, K&N filter.
313.7Hp & 320.6ft-lbf, ET 13.55sec @ 105.1mph
next mod: 4.10 rear gears

Matt89

Thanks everybody, for your advice!
One more question. Can self aligning rockers
be used with guide plates and hardened pushrods?

Thanks again.

IROCZZ3

Self aligning= NO guideplates
Non self aligning= USE guideplates and hardened pushrods.

FWIW, I'm using Crane Gold narrow body, 1.6 non-self aligning roller rockers under the stock center bolt covers with no problems.


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1989 IROC-Z, ZZ3 shortblock with some bolt-ons.
13.20 @ 108.69, 2.2 60'

FastBroker

Of course you CAN use self-aligning rockers with guideplates and hardened pushrods. You just don't HAVE to, that's all...

IrocStan

Are the GM rockers for the ZZ4(Lt4 also?) aluminum? Full roller or roller tip only? How much?
thanks

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87 IROC 350, 3:42 Torsen, pocket ported 083 heads, complete Edelbrock exhaust, Most free mods, Most little mods, aluminum d/s. Edelbrock STB, SSM sfc's, boxed rear suspension pieces, urethane bushings everywhere.
Stock cam, chip, runners, base, and trans
13.94@103mph, 2.25 60'
In the works: ported SLP runners, ported base, Xtreme Cam, homemade suspension pieces, and 27x10 Hoosiers.
Goal: 12.999

theformula

Irocstan, the rockers for $280 found on paceparts.com are aluminum full rollers.