1.6 to 1.5 roller rockers-which should i use - Hot Rod Forum : Hotrodders Bulletin Board
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Old 11-05-2004, 08:49 PM
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1.6 to 1.5 roller rockers-which should i use

Ok, i need to know if i should use 1.5 or 1.6 rockers on my stroker motor. here is what i am using:Ok, i am building another engine. This time i am basically using a scat 383 crank, 5.7 scat 600g lightweight rods, hyper speed pro dished .110 pistons .06 over to yeild a 9.8:1 compression, edelbrock E-Tec 200 heads, edelbrock vortec air gap aluminum intake, and a edelbrock rpm performer camshaft that has 234/244 duration at .50 and .488/.510 lift. Now i purchased scorpion 1.6 roller rockers, but now i think that i may have made a mistake b/c now the cam lift will be .520/.544 and i am worried that the valves are going to smack the crap out of my pistons. any help would be most appreciated. i wouldnt mind using the 1.6 ratio rockers as they will obviously boost performance. let me know what you all think. Thanks

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Old 11-06-2004, 12:18 AM
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Use 1.6s. The more lift for a given duration the better. Extra lift will not effect idle quality. It will increase throttle response and power.
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Old 11-06-2004, 01:26 AM
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Quote:
Originally posted by lluciano77
Use 1.6s. The more lift for a given duration the better. Extra lift will not effect idle quality. It will increase throttle response and power.
Don't you think if 1.6 was AWAYS better that 1.5's would even be made?


K
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Old 11-06-2004, 10:40 PM
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Quote:
Originally posted by killerformula
Don't you think if 1.6 was AWAYS better that 1.5's would even be made?


K
You would think so. Ford got it right, I don't know why Chevy didn't follow suit. I guess they made up for it later with the roller cam specs. More lift to a given duration.
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Old 11-06-2004, 11:19 PM
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Unless the heads won't flow the lift. Then why put the extra strain on the spring?
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Old 11-07-2004, 12:24 AM
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Of course the spings and clearances limit how much total lift you can get away with.

Going from 1.5s to 1.6s shouldn't normally exceed the heads flow capacity. If it does, the cam is too big, or the heads don't flow enough for the cam.
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