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Author Topic: roller rockers  (Read 7772 times)

firstgenaddict

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Re: roller rockers
« Reply #15 on: May 10, 2021, 06:58:17 PM »
Smokey had a fixture to clearance BB rocker arms for use on SB. I believe the reasoning was a BB has an advertised ratio of 1.7 but has a nominal lift of just over 1.5...
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James
Collectin' Camaro's since "Only Rednecks drove them"
Current caretaker of 1971 LT1's - 11130 and 21783 Check out the Black 69 RS/Z28 45k mile Survivor and the Lemans Blue 69 Z 10D frame off...
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crossboss

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Re: roller rockers
« Reply #16 on: May 10, 2021, 08:22:40 PM »
Quote from: firstgenaddict on May 10, 2021, 06:58:17 PM
Smokey had a fixture to clearance BB rocker arms for use on SB. I believe the reasoning was a BB has an advertised ratio of 1.7 but has a nominal lift of just over 1.5...



Your talking about the 'leverage'. A rocker ratio of say 1.7 compared to 1.6 is where the tip rolls across the valve is very important. Also, remember the BB Chevy, Boss 302/Cleveland engines have canted valves compared to the standard inline valve set ups. Different geometry altogether. Keep this in mind: the 1.7 ratio will increase your effective camshaft 'lift' by approx 8% over the 1.6 rockers.
« Last Edit: May 10, 2021, 09:45:34 PM by crossboss »
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Just another T/A fanatic. Current lifelong projects:
1968 Olds 442 W-30
1969 Mustang Fastback w a Can-Am 494 (Boss 429)
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