Lobe Centerline
Junior Member
Joined: Jan 2001
Posts: 51
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From: WI
If you mean Lobe Separation Angle (LSA), I would say about 112 degrees. I have 110,and it works, but sometimes is a little finicky and the vaccuum can be marginal depending on the duration and rest of your combination.
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'93 2wd truck
408 sb, vortecs, 454 TBI, Comp Cam, dual exhaust
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'93 2wd truck
408 sb, vortecs, 454 TBI, Comp Cam, dual exhaust
It's not so much a matter of lobe centerline as it is lobe overlap.
The stock LO3 centerline is 108. Because the duration is so short there is no overlap.
Duration and centerline both affect overlap which affects vacuum and idle quality.
Low vacuum combinations are harder to tune EFI wise.
The stock LO3 centerline is 108. Because the duration is so short there is no overlap.
Duration and centerline both affect overlap which affects vacuum and idle quality.
Low vacuum combinations are harder to tune EFI wise.
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