I posted a thread that had zero traffic on it. Maybe I was being to ambitious. I am planning on building a 346 with a sick H/C setup (MS4 or MS3, or G5X4 or TRex with either AFR 205s or ETP 215s). While the motors apart, I would like to set it up for a 300 shot of N20. I'd like to be able to spray up to 400 at the track to set some personal bests. I was originally going to go with a built 408 and a TT setup, but the logistics of the build became very expensive. So, I've settled for this. Hoping for low 10s high 9s on the bottle with the proper rear, tranny and suspenion. I would just like to know what piston, rings, seals, rods and bolts you all reccommend. I had a build sheet for my 408 but a N20 346 is a lot different than a turbo'd 408.

Please feel free to leave advice or your motor build (even if a 402, 408, etc). Thanks

 

i suggest a higher compression 383 aluminum block... you can retain you stock block... just change the rods, pistons, and crank. also you are capable of running a 300 shot on this motor more safely then a 347 or 346 setup. The cost of a 408 has me considering this. also it will appear to be a stock block, when you consider the supporting components (ie. 90/90, headers, and fuel rails) will appear stock. just my .02 cents.

 

You might have a little better luck with engine internals in the engine internals section. That's where the motor heads hang, and can help with a n2o motor build.
Robert

 

I have no idea why Forteen3GT would think a 382ci stroked LSx would be more capable, unless its because the forged crank, but nobody has snapped a stock LSx crank so its just more expensive not capable!

SVT THIS.. if this engine will see daily driven street duty I would go with Either JE or Wiseco forged pistons with lowered ring lands & gas porting, moly rings or hell fire gapped .030" (yes it will use more oil, but will last longer with street duty), rods either Callies Compstar or a set of Lunati's (more of a preference than anything technical) seals? all stock GM parts, Cometic HG, ARP Main/Head Studs and ARP 2000 rod bolts, that should do you just fine.

 

I like je pistons always had good luck with there stuff.I like flat top motors and would get a chamber that will sute the compression your lookin for.If your street driven then high compression is not in most peoples interest due to high octane fuel cost.If i were to bulid a 346 H/C motor again i would go with ET 225 and a custom grind cam from cammotion.The 225 on shot of nitrous will domiante over the 215 head.But the 215 will make a little more power N/A.You just can't have the best of both worlds when your trying to bulid a nitrous motor.

 

Sounds like my motor...

 

i assume the stock crank is fine... but will it work well with a 383? nope.

he needs more cubes to run a 300 shot safely. you can do it with a forged 347 or 346 but the more cubes the better. a 408 is more expensive.

 

True enough, no replacement for discplacement, but its not needed to run a 300shot. I would dare say there are more 300shot guys running 347 than 382 by a large margin. And of course a stock crank wont work for a 382 since you need the stroke to make the extra cubes...Duh!

 

I think the reason you didn't get traffic is because how off the mark you are on what you want to do. A 300 shot for low 10s high 9s? You are way overkill to run those kind of numbers. Instead of stabbing in the dark why don't you get with a shop who will build your motor and stand behind it. You come walking in with here's my stuff and it's all on you.