?

 

Whichever one is cheaper. GM buys the Crane Gold rockers and repackages them. Or Crane makes the GM rockers for them.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Crane $300
GM $250-270

I think I'll go with the GM.

 

Mkos,

The GM rockers are made by Crane, using the same basic design as the Gold Race series. However, GM powertrain boys realized the weaknesses of the Crane design and changed the specification for their rockers. The GMPP rockers are a bit heavier, but are also stronger and more rigid that the Crane units.

If you want to spend $300.00 for rockers, check out the Comp 1317 and 1318 rockers. They put any aluminum rocker to shame, and are lighter and WAY stronger.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

I thought the steel rockers were stronger and could give you like 300 - 500 more RPM, at least thats what I read in TPIS. But I would go with the GMPP rockers.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

 

I just bought some roller rockers for my big block today. I had Crane Gold rockers on my 383 engine. I asked what the difference was between the different models.

Crane Energizer rockers are bargain basement price because of quality. Crane Blazer and Gold rockers are both made the same. The only difference is that the Gold rockers are undercut for the use with larger diameter springs and they'll also hold up better with huge spring pressures. Typical engines only need the Blazer rocker (cheaper than gold but made the same) and if you're really on a budget, get the Energizer rockers.

As for the type that Crane sells to GM I don't know. GM buys most of their valve train components from Crane.

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Stephen's racing page

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
454 Big Block buildup now in progress for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Best 60 foot: 1.662

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car
91 454SS daily driver
95 Homebuilt Harley