Thread: Any website that calculates HP?

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Well my heads had been rebuilt and had new stock springs installed. My engine runs up to 7,000 with no problem, Ran 6,200 rpm through the traps with my 3.55 gear. Now with my 3.7 gear i hope to gain a little more rpm.

Originally Posted by chevydrivin

Well my heads had been rebuilt and had new stock springs installed. My engine runs up to 7,000 with no problem, Ran 6,200 rpm through the traps with my 3.55 gear. Now with my 3.7 gear i hope to gain a little more rpm.

I am no exspert ,but I would do as 500 caddy suggested on the stall,1.6 rockers if you have the piston to valve clearance.
A small bore engine ,needs lift to help the shrouded valves breathe,but not so much as to get into piston to valve clearance or where you get the engine out of its power band,which in my opinion your cam and rpm are a little too much for these heads.
Take a look at this link, http://www.goingfaster.com/spo/343hp305.html ,the build is very similiar to yours and mine,the only difference is the cam you have,the link states that 343 hp at 6250,which seems to be about the rpm these heads nose dive unless mods have been done{notice how it nose dives on the dyno numbers after that rpm}.I used a comp xe 262 h in mine for a approx 300 hp,which is about the same size as the cam in the link.
All the dyno numbers on these heads I have seen on these heads show the smaller inch engines do good til around 6000 rpm,a 350 cubic inch engine drops the rpm approx 500-600 rpm for max hp.
Heres a vid of me revin mine up for the first time,needs some more tunning in this vid though.The throttle response is much better now......thnx to Denny.
http://youtube.com/watch?v=ld4vfbizOBI