89ws6formula50

iTrader: (6)

I am building a 408, I am seeing the posts on going forged 346, hear some of them run 10's, if this is true, why would we go stroker, the 346 are getting 490RWHP? What should I be looking for outta my 408 with all bolt ons, LT's, LM exh, Z1 MTI cam, 6.0L 317 heads done S2? RWHP and torque figures anyone?

GrapeApe

Yes it is true -- but you should see about 505ish and 485ish in torque
ls1 strokers are pretty far under square -and that kinda spooks me a lil
so if i do aother ls1 most likely be a forged bottom end 346 but blueprinted and bal.
are you doing a resleeve or a lq4?

89ws6formula50

iTrader: (6)

I have a 2002 LQ4 with the 317 heads. I will prob keep the LS1 when I pull it out and maybe build the lower forged in case the 408 goes south on me.

89ws6formula50

iTrader: (6)

undersquare, still not sure I quite understand that word

blk~2000~Z28

Example: Ford SB 302 4 in. bore 3in. stroke

The bore is more than the stroke making it oversquare. An example of the LS1 strokers being undersquare is because they are a 3.9XX in. bore and a 4.XXX in. stroke in most cases. A perfectly Square engine is when the bore matches the stroke.
These are my understandings of the concept anyway.

89ws6formula50

iTrader: (6)

oh I see,

Quickin

With the 346 you need to run allot higher compression and have an idle quality that just BLOWS to get close to 500 RWHP, and you still won't get the torque like you will with a stroker, unless you like the car shaking and loping.

stroker= high hp and torque, smooth idle, better daily driver, probably allot more reliable in the long run to. not much more $$$ than the built 346.

VINCE

iTrader: (1)

We need to get something straight.. A few cars dyno'ing close to 500rwhp out of a 346ci is not the norm. Actually 450rwhp is not the norm. If you ACTUALLY look at the post you would see the same people posting and talking about the same cars over and over again. The norm is still between 400-435rwhp out of a GOOD H/C 346ci package. I will tell you what is the norm. 400ci plus motors dyno'ing over 480rwhp and about the same amount of torque. If you put a 490rwhp H/C 346ci car up against a 480rwhp 408ci car you will watch the 408ci walk away every time. Your idea of the 408ci is perfect.

89ws6formula50

iTrader: (6)

gotcha, good thing then I will just stay with the 408. Was hoping I didnt just buy a whole engine for nothing.

bspz28

iTrader: (1)

Lets see the 408 try to walk away from my car

VINCE

iTrader: (1)

Not a problem if you are within 200lbs plus or minus and you guys are sporting the same suspension and tires with similar drivers. By the way, how is that AC?

383ss

iTrader: (14)

thank god other people notice that. everyone expects the HUGE numbers they see out of some of the cars on here on theirs. I constantly see it at the dyno here in KC. people are dissapointed with 430-430 rwhp out of a H/C package from what I've seen, that's the norm.

Colonel

Dyno numbers don't mean squat when it comes to track performance. When I see a 346 pulling big cube trap speeds then I'll say "Why go larger?" That means pulling 140+ MPH trap speeds NA...of course, by then the big cube engines will be going even faster.

sr71bb

iTrader: (3)

I will second the opinion that 346's rarely will see more than 440/450 RWHP. I had a 346 CAM only (stock heads) 6 speed that made 417RWHP but down here that was the highest RWHP for an LS1 at the time (about a year ago). It had a SpeedTek F1 cam in it and true duals but it was still considered a FREAK at the time. EVEN with a GREAT set of heads that car probably wouldn't NEVER dyno more than 465 with that cam. That car's BEST was time in the 1/8 mile was 7.2 at 94MPH NA.

beardWS6

iTrader: (1)

leave us 346`s alone!!!!