C4 ZR-1 Discussion General ZR-1 Corvette Discussion, LT5 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track

Lt5 383?

Old 03-16-2019, 12:16 PM
Dominic Sorresso
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Originally Posted by Rkreigh View Post
Agree, yet many will overlay dyno sheets trying to convince themselves they got :the same thing" it simply isnt, cant be period. 2 different animals. the 4 valve dohc imo is superior.
Sometimes wonder if lots of these older LT5 cams have too much duration/overported parts and can make more with less.
if you go max porting on a stock displacement motor it still makes gobs of power. the ports are small volume and high velocity

these motors don't need super high lift radical cams to make power. In fact, many use the stock exh cam and do quite well[/QUOTE]

Exactly Ron. I seem to recall someone mentioning the stock exhaust ports at being 95% efficiency as compared to SBC of ~ 70% which is supposed to be good.
W 2 smaller intake valves, u have less inertia and less need for monster lift and duration as we see in the LS motors innorder to make the same power. Take andtock LT5, port the top end and port match heads, add headers and exhaust. With tuning ur at 400 to the wheels while idle is ~ 800rpm. To me its one of the ultimate DIY motors readily available.
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