Reply to "cleavland heads"

The 4V intake & exhaust need not be port matched unless you're intending to race it. As for running 4-V valves, No- for two reasons. First, they don't fit unless you have someone recut the seats and re-port the heads- a rather expensive endeavor. 2V heads take 2.08" intakes and 1.65" exhausts, slightly smaller than your 4-V valves. Second, stock valves are made in three pieces, welded together. Under stress, they break apart, utterly destroying the engine. I advocate using one-piece stainless valves.... and if the ad doesn't specifically SAY 'one piece', trust me- it ain't. Also, the stock split locks for each stock valve are what is known as 'multi-groove'. Under stress again, these locks sometimes release the valve stem, again destroying the engine. Use single-groove valves and matching split locks. Third, whatever cam you select should have a recommended valve spring to go with it, along with brand-new lifters. The remainder of your 4V parts can be re-used. As for octane boosters, I don't use or need them in my engines, so I'm unfamiliar with that product. Apparently, some do help but I believe its better to not engineer an engine with such high compression that a booster, or race gas, is necessary. The inconvenience isn't worth the possible extra power.