300 HP out of a 318, is it possible with bolt ons?

junkyardhero said

i see this motor build referenced time to time-- in fact it was mentioned up thread and i commented on it-- and what people fail to realize is that while yes, it is a stout piece, don't just look at the lofty numbers. look at where the power is made 4000~6000 rpm

i've built this motor, exactly this motor, twice. if i was looking for 300hp and a nice street driver, this isn't where i'd start, especially on a budget.

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the engine I built about 15 years ago for my 5th avenue was the stock block, reringed with moly rings, thin MP head gaskets, magnum heads with a fresh 3 angle valve job that I did some bowl porting and gasket matching, 600 cfm edelbrock on an RPM air gap, hedman headers, stock magnum lifters and rockers, and had the LA roller cam reground by bullet cams to their HR256/326 on the intake (256 adv/[email protected]/[email protected]) and I can't remember what lobe on the exhaust, maybe the HR267/325, and that engine ran GOOD. IIRC the stock LSA on the factory cam was 112, I think I installed it 4-6 degrees advanced (106-108 ICL)...can't remember what springs, maybe hughes 1110? I remember I limited my lift so I didn't have to have extra machining done either on the valve guides, or it was a limit I could handle before coil bind....it was a long time ago....anyway, that engine had great street manners and power from off idle to about 5500 RPM, and ran as strong as the stock long block 360 with the same induction system and a comp XE262 flat tappet, which it replaced, but got another 5mpg....

if I remember right, the .2" lift duration of that roller lobe was actually the same or a few degrees bigger than the XE262.