i know we have these two ratio's to choose from on these roller rockers. Which one is better? Under what mods do each do their best? What about for my current mods. If you do these, will there be a significant gain? alright.. thanks!

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85 2.8L Sport Coupe 5-speed.
Mods: Hpertech chip and powerstat, MSD 6A-L, Crane fireball coil, Dynomax hi-flow cat and catback system with a dynomax magnum race bullet muffler on the i-pipe, K&N filterchargers, Eibach Sportlines and Tokiko springs/shocks setup, Global west sub frames, Suspension techniqs front and rear sway bars, and good ole 88 IROC wheels with Kumo Ecstas on em!
"I'm out to seek those pesky VTEC boys!" (don't get me wrong, I'm asian myself! hehe)

Wins: 2000 V6 Accord, 69 302 Mustang, 2000 Auto VR6 Jetta, 89 Toyota MR2, 90 Civic Si, 76 350 Camaro.

 

Think of the 1.52's as a "precise" factory rocker (with a bonus roller tip). Factory rocker arms are said to vary in ratios between 'em.. so your factory 1.50 rockers might really be a mix of 1.46 and 1.48 and 1.45 and 1.55 and 1.50 and 1.44 - all that irregularity doesn't help power.

The 1.52's are an exact 1.52- so a power gain would be mild... you're mainly getting your increase from all rockers having the same ratio. The 1.6's will be the ones to give you more valve lift...

...and that's where I'll stop. I plan on using 1.52's on my motor, but I know some guys here have experience with the 1.60's.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

is it true that you can actually lose power if you move to 1.6 rockers? what about if you add a cam along with the 1.6's? i wanna put some rockers on my car since they're easier than a cam but more power suposedly than anything else that i havnt already added. aight payce

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85 2.8L Sport Coupe 5-speed.
Mods: Hpertech chip and powerstat, MSD 6A-L, Crane fireball coil, Dynomax hi-flow cat and catback system with a dynomax magnum race bullet muffler on the i-pipe, K&N filterchargers, Eibach Sportlines and Tokiko springs/shocks setup, Global west sub frames, Suspension techniqs front and rear sway bars, and good ole 88 IROC wheels with Kumo Ecstas on em!
"I'm out to seek those pesky VTEC boys!" (don't get me wrong, I'm asian myself! hehe)

Wins: 2000 V6 Accord, 69 302 Mustang, 2000 Auto VR6 Jetta, 89 Toyota MR2, 90 Civic Si, 76 350 Camaro.

 

stick with the 1.52's..

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1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil (Fireball in future) Accel 8.8 wires, MSD Ignition Module, Auto Meter Gauges (Water, Clock (needed one) Fuel Pressure, and 5" monster tach)TB Bypass, 4th Gen Seats

Coming for my v6:
Panhard Bar, 4thgen front seats, Nitrous, Line Lock, and Ram Air 2 hood

"I'd rather run last in a full out race, than to not have run at all"

 

Go with 1.52 roler tips... More accurate, and with the stock cam you will notice a gain. My buddy did 1.6's in his 2.8 and lost power.. He than had to add new valve springs and still it was crappy, but beter.. Now he is looking in to the cam all because of the wrong size.....

 

Tell him to find a 3.4 cam from a FWD application.
It's designed by Crane for GM

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA