I have a 355 with edelbrocks rpm performer cam. the lift on the cam is .488 and .510. Should I get 1.5 rockers or 1.6. If I get 1.6 do have to get different lifters and pushrods? What is the differance between the two. Thanks

 

You won't need new rockers, lifters or pushrods, but you for sure will need to shorten your valve guides and get new springs (assuming you haven't already). I would go with the 1.6s to get more lift assuming you think the car has enough intake and all to handle more lift. That will bring the lift at .520/.544 which is pretty extreme. I am running .498/.498 lift with my LT4 HOT Cam with the 1.52 rockers, and that is probably too much lift for my car as it is now. Just somthing to consider.

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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, Performance Resource Chip, 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 (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

Soon to Come: 7.625" 10 Bolt with 3.42s and Accel TPI Intake Base

 

Look at your edelbrock cam card, it says do NOT use anything but 1.5 ratio rockers. Why it says that I dont know but it does.

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Bright red 87 GTA with I have stock 3.27 gears,stock converter,B&M shift kit, TRW forged 9.75:1 pistons,comp cams pushrods, edelbrock valvesprings, 462 camel hump heads with 2.02in/1.60ex redrilled for angled plugs, 3 angle valve job, ported and polished, performer RPM intake, mallory fp regulator, edelbrock 750 CFM carb, hei ignition(new) with 10,000 volt coil,No cat, flowmaster 2 chamber mufflers, hedman full length headers, edelbrock cam with 488/501