I've never seen a price on Modular Performance for a standard cobra crank so I can't compare that.
Their stroker kit is $200 more than the ModMax kit offered by MP, but I don't believe it is comparing apples to apples. I don't know who makes the rods/pistons for ModMax - anyone know that is 100% certain?
I've just heard a lot of bad things about the ModMax valve springs (don't know if they've resolved it) and that would make me hesitant about their full kits. Others might be running them without any problems though.....just me though and not basing it on any data.
HP is irrelevant, cylinder pressure and detonation are the issue.
To say they can handle more/less HP, neither is correct. However as a general rule of thumb the more boost you make, the more power you will make (I'm over simplifying as boost is actually a measure of restriction, not power) and the more boost you make the more compression ratio comes in to play and the lower the compression ratio, the lower the chance for detonation assuming a proper tune.
Just my 2 cents. I had this same question a short time ago and after a lot of advice decided to go with manley rods, cp pistons, and undecided on the crank. Manley and CP are tried and true as are JE, Ross, and others. I ordered my Manleys a couple days ago from Livernois for $550. I'm told the GT crank will easily handle 500 rwhp so I guess it depends on what level you intend to take the car. For the money I'm gonna' spend to build this thing I figure another $600 for a cobra crank is probably going to be the best move but just not sure yet. Good luck.
Pete, I looked into the rods a little bit too. The only difference I could find is that the Manleys are a bit lighter than the Eagles. Something like 701 grams for the Eagles and 671 grams for the Manleys. Everyone I've spoken to seems to like the Manley rods just for the proven track record, I guess. I agree with you on the crank. I probably shouldn't even be thinking this hard about it.
Manley Forged rods are in my car.
I would go with CP if the pocket book allows.
The VT stuff is nice.Scott and Jim do a great job at keeping prices competetive and also the customer service rocks.
We have switched exclusively to using thier prodcuts to build our motors.
I cant wait to try the stroker out this fall.......
Keep in mind,sometimes paying alittle bit more for good info and great customer service is worth it.Its nice to be able to call someone up and get answers to questions long after the sale is made.