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· Premium Member
6,111 Posts
The Streetmaster would probably be very good on the 318 given it has slightly smaller ports, something that can be good compared to the performer stamped 318/360, the larger ports don't match as well for a 318 and even though larger intake ports, the mismatch is worse at lower rpm. There is about a quarter inch taller ports on the 360, which makes an interference in flow on the 318 you don't need or want. As far as a mild cam goes, the 318 does come alive with a 340 or 360 grind, stock 318 is around .398 to .410 lift, the 340 and 360 falls in around .430 to .440 lift, enough to wake a 318 up quite a bit. Another good one is what is called an RV cam. About the same lift as the 340/360 cam and just a hair more exhaust duration.
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