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01-05-2010, 04:35 PM
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#1 |
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Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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cam lobe question
i was looking at a 1975 454v8 truck 4 sale and i read some manuals and all years except 75-76 list lobe lift at .2343 intake and exh. but 75-76 was .2590 intake and exh. yet their was no power increase, no change in compression why were these two years different? or were they typos? at valve, thats like .042 extra lift i figured u see a difference. i thought maybe to make up for low flowing heads, any ideas why? its not a deal breaker i was just curios thanks
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01-05-2010, 09:12 PM
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#2 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: cam lobe question
It could have been nearly anything. There may have been emissions issues involved, that was right in the prime years of that kind of thing.
BTW, that's only .025" difference.
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01-05-2010, 10:42 PM
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#3 |
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Registered User
Join Date: Nov 2009
Location: stoddard nh
Posts: 693
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Re: cam lobe question
yeah i figured it was emissions i was just curious. its .025in at lobe but times by 1.7ratio rocker you get .042in at lift so were both right!!
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