Latest 440 Source Stealth head set

txstang84 said
IQ, so if I read this correctly, you assert the stealth heads aren't bad as far as aftermarket pieces go but to get the most out of them or even consistency, it's likely better to buy them bare and have a machinist go through them with a fine tooth comb and install good parts from the get go.

I have a pair of 516s that have already been ground/cut on and an untouched pair of 915s for my 383...but I don't want to rule out the possibility of running aluminum heads, and I know regardless of which direction I go, I'm likely to spend at least $1k just in machine work and pieces parts to go into whatever castings I have...the only significant difference being if I take those 915s anywhere, the labor cost will be more for any port work due to time involved, but I would like to achieve 400rwhp out of an N/A 383...

On the Stealth, depending on how you want to go with them would determine how complete you buy them. All out, maybe bare. For a general build with some extra power, get them complete.

400 RWHP is a bunch outta a 383, nearly 1.4 HP/CI at the flywheel. Can be done, but I wouldn't skimp on the cylinder heads then. Any iron head will have to have some real work done to them. On a 915 you will need valves, guides and port work to the tune of about $900 to get to the 265 cfm range, roughly the flow of an OOTB Stealth. Then there would be the added cost of retainers, locks and springs depending upon the cam. I don't believe that would be enough to get to the 400 RWHP goal. The 915 can be taken over 300 cfm but then it does get expensive.