Mangled03gmc

iTrader: (95)

Yes I am going to put the blower back on, gona shoot for some where around 15-18 psi, not sure yet... Like stated the 370 seems to be more friendly, cause of the rod angle from having the stroker crank and what not.. Not that it (408) isn't reliable but big hp can be had from the weee 370 Yes I know you were giving me a hard time, as most of my fellow ***** tend to do..

dlt76028

iTrader: (13)

I just read through that whole thread and it seemed to me more people were leaning towards the 408. More cubes equal less boost and less rpm to make the same power as the 370, which in turn equals longer life... IMO

turbocody

iTrader: (6)

Ok, since the 05+ have the better rods, does anyone know if the rods bolts are better too? I dont think I've heard a failure on ls2 rod bolts.

03 BLACKOUTSSS

iTrader: (3)

Correct, however its the heads that matter in that case. It doesn't really matter if its a 370, 408 or a 572...if it can only take in so much air, it will not change the power that much. Now if he was putting a set of Aero Heads on there, Id say the bigger the better.

Plus, the rod deflection angle on a stroker motor is greater than that of an N/A setup, and in boosted situation, especially heavy boost like what John is talking about, less deflection of the rods from the crank centerline will be a more reliable motor. Not nearly as likely to spin a bearing.

StrokerAce03

iTrader: (7)

If you're upgrading rods then it'd be a good time to go ahead with some ARP's since you're there anyway. Just cheap insurance.

GMCtrk

iTrader: (27)

You are completely ignoring all the geometry and such that goes along with a longer stroke. It will consume more oil and it will not be as reliable in the long run as the 370. With boost I see really no reason whatsoever to go with the 408 over the 370, unless you got money to spend.

1Bear

iTrader: (1)

Actually I'm somewhat suprised that I have not seen anyone use one of the reasonably new GM LSX 3.750" stroke 4340 cranks. I understand that most folks that are going to spend the money for a forged crank can't help themselves and get the largest stroke that will easily fit in the bottom of the motor, but the 1/4" less stroke would go along way's improving the longetivity of these stroker motors. Besides that, an old school sized 383 just sounds about right for a good small-block.

hellbents10

iTrader: (10)

All of the 05' newer engines got the better rods. The 03' +LQ9's were the first to get better rods BTW.