1971 B20; C cam, steel gears, ARP rod bolts and head studs, Venolia pistons +.030, plasma-moly rings (never heard of these until I received them), clutchnet 4 puck ceramic disk. F head flows approximately 30% over stock on the exhaust side, very close to stock on the intake side (this was a large disappointment). 4 into 2 into 1 header – whichever John was selling before he started making his own. Header outlet is 2.5”, exhaust is 2.5”.

Needs a cam, the old C grind is a pitiful excuse. A VV-71 with ultra wide LCA.

Why are you disappointed with the intake ports? Did you ask for porting & get none or something?

I’d guess that the weak(est) point in this engine is that it uses stock rods. There are a number of things I’d do differently now that I didn’t know enough about when the engine was assembled, and a couple things that I did request that I don’t think happened. It’s not perfect. It’s awfully fun, though, and once we got through some teething pains has been really reliable.

There's not much wrong with the stock rods for what you are doing. What would you change?

The headers probably aren't worth a single HP given how tiny the cam is, but I guess it saves a little weight.

plasma-moly rings (never heard of these until I received them)

Moly rings have been around since I dunno when, but I used them since day 1.

The are a ductile iron ring with a groove in them that is filled with moly & then the ring is lapped. They are the reason engines no longer need to be run in much past breaking in the cam. Older chrome plated or plain top rings need some bedding in. There's no reason to use chrome anymore & there is no reason to cheap out & get plain top rings either.


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Three 164's, Two 144's, One 142 & a partridge in a pear tree.