906 Head shop

Doosterfy said
Have you purchased and used Stealth heads? I'm mulling over what head to use on my 440. The short block is fresh with flat tops and a zero deck piston height. I have 906s with new guides, spring seats machined for 1.55" springs and the seats are machined and done for larger valves. I have to purchase valves and hardware to put them together but I'm considering buying Stealth heads for two reasons. 1) It will save me time 2) they have smaller chambers than the 906s and I hate low compression which is what the 906s will give me (9to 1). I hate the thought of using chinese parts but the Stealth heads fit the plan perfectly. 440 Source will not answer my questions about weather or not the valves and hardware are also chinese and I fear the catastophy if something fails and the motor swallows a valve so I'm looking for feedback from anyone who has used the Stealth heads.

The Stealth valve doesn't have the quality of appearance that the Edelbrock valve does but I've not heard of Stealth valve failures. Where the Edelbrock valves have a swirl ground finish, the valve head on the Stealth is machined and shows the cutting tool marks. The Stealth retainers and locks should be replaced immediately. Out of the box the Stealth head does not flow as well as the Edelbrock, therefore the Stealth head will require some port blending underneath the valve seat and around the short turn to equal the Edelbrock.

As to compression, by just replacing the 906 with the Stealth you will gain about .7 point of compression. So if you're running 9.3:1 you'll go to 10:1 compression and at 500hp you might go to 514hp. The stock Stealth will way outflow the stock 906 so a horsepower gain will of course be see there. It's pretty easy though, for someone who knows what they are doing, to bring a 906 with 2.14/1.81 valves, to the flow levels of the stock Stealth.