I was planning on 408 but my LS1 block is fine so I may go the N20 fed 383 route as well. I could build a "moderate" 408 with L92 heads, L76 intake, nice cam, semi-upgraded valvetrain and have it installed for a hair over $7000.
I could build a disgusting, track worthy but streetable 383 with a big shot for the track (ha, and the street) for a similar price, if not less.

I am looking for close to 500/500 numbers, more with N20, and 10 second timecards NA with either motor (suspension, 4400 stall, 4.10s and radials)
How does this sound for a parts list for me for a 383 build. Keep in mind, it is a daily driver but could see 200-300 N20 at the track.

-Lunati Forged 4.00'' crankshaft (is this overkill, should we stay with Eagle?)

-Scat H-beam rods w. arp2000 rod bolts (should we go with Callies, Lunati pro mod or Lunati pro billet? or are we okay with the scat's?)

-Diamond full N20 piston set w/ heavy duty steel top (chrome top better??, W2W piston instead??)

-ARP main caps, studs, bolts. What else to build to spin to 7200 redline

-AFR 225 heads milled to 66cc (different mill?) with 2.02/1.57 valves (should we bump up to 2.8/1.60 valves with more cubes and higher revs??). Should we go with out of box AFRs or have them CNC'd? What about a set of ETP 215s or some Trickflows?? Maybe even L92s??? Cometic gaskets or gm?

-244/250ish cam on LSk lobes, looking for sick idle, 11.5:1 CR and power from 4000-7200 on 91 octane. Different cam for this power range? I love the 110lsa cam sounds, but am not a guru by any means so advice here is needed.

-42lb injectors and in-tank fuel pump (will this be enough for 200-300 shot)

-Fast 90/90 or Vic Jr. setup? L76 if I go with L92s

-LS7 lifters, LS6 oil pump, double roller timing chain, chromolly pushrods, patriot or PRC dual valvesprings to .650 lift.

-Harris speed works N20 kit with a "small" shot


What are the chances of running the L92 heads and L76 intake on a 383?
Did I read right that the stock LS1 block doesn't need to be bored out to make a 383, just the stroker crank install? Anyone with this experience chime in!

Is this a horrible idea? Should I go with the flow and buy a 408 and be fast buy be nothing special? Or, should I go with a nice 383, be different, have SOME street manners, but **** the doors off with the flip of a switch?

 

500 n/a plus a 200 shot is 700 rw, maybe 800-850 flywheel, i dont think a intak will support that

 

Wow... there is A LOT of questions in that post. I suggest speaking with one of our helpful sponsors.

Ben T.

 

The l92 heads will not work well with the ls1 block because of the valves being larger. You need at least a 4.00" bore to use them. More bore is desired because of valve shrouding. The L92/L76 combo would be better matched with a 402 or 408 stroker combination.

You are right the ls1 block does not need to be bored out for a 382. You will however need a hone to clean up the cylinder walls and set your proper piston to cylinder wall clearance. It is not recommended to bore/hone the ls1/ls6 blocks because of thin cylinder wall liners.

 

No offense to the sponsors but I have recieved no help from them. They offer great products but they are yes men. They don't offer any tips or advice and just add up the total cost of the parts. This forum contains a vast wealth of info I'd like to tap into.

 

Well, good luck then!!!?

Ben T.

 

i would go with an iron 408 with the 918 pistons with a set of trickflow 225 heads with a cam similar to mine or slightly bigger and with a 90/90 setup you should be 525-535rwhp,490-500 rwtq easily. there will be no need to have to spin it to 7,200 rpms however unless you use quite a bit bigger stick because mine peaks at 6k or slightly higher so 7.2k power would be down quite a bit. the iron will obviously be heavier but when spraying that kind of shot that is the block i would want.also there has been some less than stellar results with the l92/76 setup from a few combos and they seem to be picky about what cam to run.

 

Will those 42 lb injectors support what you are trying to do? Might want to go ahead and step up to 60 lb injectors.

 

Why do you want to spin the motor that high?

 

TTT... For ya SVT!!!

 

I run a 383. It's awesome.

For engine components, Lunati Crank, Oliver Rods, and 2618 Wiseco pistons will put anything else to shame. Go for the 1/16" ring set for better seal. ARP main studs are all you need. That'll handle a 300 shot no problem.

I'd go with small bore AFR 225s out of the box with AFR 8019 springs milled down to 61cc or so (11.7:1 CR with 6cc dish in the Wiseco pistons), Ported FAST 90/90, an Ed Curtis Custom cam like the Hellraiser 238/242 .650"/.630" 111+2 LSA, and high-velocity merge collector headers from American Racing/QTP into true duals with 3" bullets.

With Cometic .040s, EWP, UD Pulley, and Morel lifters, you should see 500-515rwhp and about 475rwtq.

Of course, I'd also spend the money on hollow-stem valves for less weight, then run Jesel J2K rockers with Manton or Trend .135" 3/8' pushrods. You can spin that to 7400 with no problem even with LSK or other aggressive lobes using a standard spring.

I'm already out of your price range, but I'd look into the Textralia Exo-Skel twin disk clutch as well to help out.