Posted by Ken (129.37.250.33) on March 01, 2001 at 20:48:57:
In Reply to: Re: Help with these heads posted by Todd on February 28, 2001 at 20:43:21:
Ok , now were cookin a little. You told us a little about your engine build. The compression is on the high side for the street and you need premium gas. Depends on what the cam is as to the expected RPM range. Is it being feed by at least a 600 cfm 4B? I would expect in fine tune that your are in the 275 HP range.
The cheapest HP increase will be NITROUS but only last 10-15 sec. a bottle on average at about $500. Next would be supercharging but that will be upwards of $2000.
Best way is a 347 stroker 5L motor and yes "heads" to get upwards of 400HP. What's your pleasure? 400 in. small block-475 HP.
No matter how its done ya gotta get air in there to make HP. Note that nitrous only supplies extra oxygen in lew of more air and is why more fuel is needed to keep the air-fuel ratio in the range of 12:1 so things don't burn up.
From the point your at now there's not much more to be done except spend money to get the level your after.
Remember that the higher the RPM the more air the engine needs to injest. Then you can see why the stock heads don't cut it above 5500 and aftermarket heads need to be considered.
The best to you. Ken