Originally Posted by Kai
In a very basic sense.Actually, it's the block that makes it an LS/VTEC. What he did was a very wise thing to do, since the B18C guts are much more rev stable (1.58:1) then the stock A/B guts (1.52:1). Only 37cc was lost in the process, a very fair trade.
Not to mention the fact that B18A/B blocks sell for about $500 cheaper then B18C blocks.
Actually it's 1.54:1 for the B18A/B blocks. The reason they are more rev stable is not the R/S ratio as much as the rod bolts. The OEM LS/B20 rod bolts are pretty weak and can't handle very high of an RPM. I've seen OEM LS rods with ARP rod bolts rev to 9500 with an OEM crank girdle, and OEM LS crank. Also, the GSR/ITR both have the OEM crank girdle, which helps in high rpm stability. .04:1 of a difference in R/S ratio won't change a whole lit in terms of revability of a motor.
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