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- Thu May 06, 2021 10:33 pm
- Forum: Engine Tech
- Topic: 47.5 rule for flat tappet camshafts
- Replies: 58
- Views: 56857
Re: 47.5 rule for flat tappet camshafts
Isky claims that the Comp XE cams violate the 47.5% rule. The 47.5% rule applies to flat tappet cams for SBCs with 1.5 rockers but the concept is still the same for other configurations where the designs are "on the edge" or "over the edge" for lobe intensity. For 1.5 ratio SBCs,...