They'd work great if you were just rebuilding a 6.0. But when you talk about stroking the engine up to 402 CI... the thing needs air.

 

Sell the heads and re coupe some money.

As mentioned a stroker needs to breath.

If you really want the most out of a 402 or 408 you really need an aftermarket head casting and good intake manifold.

You could get buy with 243 or 317 that have been reworked with a stage 2 or 3 port job but your not going to get the most out of the package on the Top end.

Stock heads were designed for a stock displacement and work really well when you build around that.

You can make 500-600 HP real easy on a stock crank. We have guys pushing upwards of 1000 HP on a stock crank.

Before you drop 2 grand or more on a Stroker and realize you need more expensive parts to make it work right I would sit down and figure out exactly what you want. Maybe talk with guys on here that have 408's and see what they did and how the feel about there set up.

Ask questions like;

How do you like it???
What would you do Different???
Was it worth the cost???
Did you make any mistakes???
How much more do you think you spent then you initially though it would cost you???
Did you build it or did some one else build it for you???

It doesn't seem very expensive at first but it can Snow Ball really fast. Asking these types of questions can give you a better Idea of what your getting yourself into.

 

Thanks guys good info an I guess I will sell them soon if I don't put them on my modded 5.3 rebuilt an bored. 20 over etc. And i see 6 grand in the hole for the build! but I've already got my intake 1 small step Towards the 408 build and would these heads be better? http://www.texas-speed.com/p-1179-pr...ted-heads.aspx