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Originally Posted by Roll'nSlo
Ok, 12:1 it is on that topic. Thanks.
Next dilemma, is I can't stroke it and get the heads both. Which way would everyone go, 489 w/ stock 781 heads or 461 w/ 320cc, 115cc heads. I'm leaning towards the 461. I know I probably won't get the 700hp out of it but maybe close?
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Go talk to a builder. You dont want 320cc heads on a 461 street engine. There was a guy on another forum I go to with a 11:1 496, out of the box 270cc Brodix Race Rite ovals and a comp solid roller running mid 10`s in a street car.
You can use your 781 heads on either engine but you wont see 700hp from any engine with them unless they have been heavily ported by a pro and/or you use a supercharger. Going 12:1-13:1 on either engine will help make some good power. I dont know what kind of money you want to spend but for $1500 or so you can get the summit 305cc iron square port heads which are actually dart heads. They will work pretty good on a budget. Stay away from anything with the PROCOMP name. Trick Flow Ovals are good heads too.
You can get a balanced rotating assembly from Chris Straub, the link I provided. He can set you up with everything. Rotating assembly, heads, custom roller cam. With the rigth parts and a matched combo you can get 700hp from the 489 but you have to use good quality parts and match everything up. Contact Chris Straub and tell him what you want and see what he can do for you.