ok guys well im looking 4 a block 2 stroke out 2 a 408 and then procharge it. will this block be dependable if forged bottom end and internals. shooting 4 800rwhp on a dd with a procharger at most i want 2 run 15psi. will this block be i good how about the ls6 blocks ther 6.0 2 arnt they? i need dependable block i can build up.

 

the ls6 blocks are 5.7. If you want to run boost, get an iron block out of a truck(lq4 or lq9). they can handle more boost.

 

An aluminum LS2 block with a 4.00" stroke crank will net you 402ci at the standard bore. If you have the cylinders honed .005" with a torque plate you'll have a 403ci engine.

When people talk about a 408 it is usually the LQ9 iron block bored .030" with a 4.00" stroke crank.

(Either one of these two blocks will handle 800rwhp if assembled correctly with the right parts. It all depends if if you want the iron block for a little more strength, or the LS2 block to save some weight.)

An LS1 or LS6 block with the same 4.00" stroke crank will get you somewhere around 382 or 383ci.

LS1=5.7L 3.898" bore (aluminum)
LS6= 5.7L 3.898" bore (aluminum)
LS2=6.0L 4.000" bore (aluminum)
LQ9=6.0L 4.000" bore (iron)

 

can i run 15psi safely on a ls2 block if i forge it. i want 800rwhp on a dd but dont know squat about the positives and negatives of iron truck blocks. i really wanted 2 have a ls2 block because of how great people say they are 4 high hp.

 

exactly u made it clear thank u. but which one would u use how much weight will i be saving? and how much stronger will the iron block be?

 

Iron is gonne be stonger ! but the all can be built for what you want ! Alum. is gonna be 60 lbs lighter!

 

i got a buddy with a 408 and a procharger and just ran a 10 flat with on a 1.60 short time! look up ts6!

 

I had Weber Racing build me a LS2 403 short block a couple of months ago. I'm going to run a Vortech T-Trim on it, shooting for ~700rwhp.

 

I'd run an Ironblock, the Wiring it practically the same, all you have to do is drill and Tap the Flange on the drivers side of the Block for the Alternator Bracket.

 

so which one would be cheaper 2 get 2 that level im lokking 4. i mean internals and stuff school my dumb *** lol.

 

Ironblock is cheaper than Aluminum and more durable. Internals cost the same.

 

im really torn between making a cam only 10 second ls1 or a procharged stroker. i just dont know what 2 think any more.

 

ha there should be no question there stroked ls2 with a procharger....hope u got a trans and rear end lined up for that operation ur tryin to build!!!!

 

Agreed - sounds like he is building a test rig for drivelines - or for TIRES !!!