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10-26-2012, 09:01 PM
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bbc cam upgrade
I got a 540 BBC with a 684 lift 316 duration cam I need to replace the cam after shearing off the bolts and breaking a lifter I have enough room for 780 lift but don't want that much I was thinking 720-730
range any suggestions 
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10-26-2012, 10:09 PM
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Got More info like head, comp ratio, run alot of nitrous, na setup etc..
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10-27-2012, 12:52 AM
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who built the 540? is it a roller motor?lift is just 1 aspect of the cam
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10-27-2012, 06:27 PM
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It,s 13.5 comp brodix BBC2 xtra heads built by dower race engines .I run a liberty clutch type 5 speed in a 77 firebird that weighs 3400 lbs 514 gears 29.5x 13w slicks and 114 octane race gas
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10-27-2012, 06:30 PM
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It's a roller motor
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10-27-2012, 07:15 PM
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If the engine was making the power you wanted at or close to the RPM you wanted,then make a slight change to reflect your needs
add 4 to 6 degrees or add .030 lift to raise RPM about2-3 hundred RPM,keeping same icl/lda
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10-27-2012, 07:41 PM
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Thanks for the help
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10-29-2012, 11:15 PM
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Need cam specs and head flow,not 316 degrees which im sure are advertised duration. Opening and closing points and lobe separation to name a few. Lift is matched to head flow.
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