427TTA4

iTrader: (1)

Like the title says do guys you think 500hp is possible with a stock ls1 short block.I was thinking of boosting my car but I changed my mind and am sticking to all motor and selling my nitrous kit.So my question remains on the 500hp mark for a stock ls1 bottom end or whats the highest youve seen so far?Im barely getting back on the ls1 game again so I have slight knowledge for engines but not too much then again thats why people ask right?Thanks for looking

lemons12

iTrader: (71)

500Rwhp? That is very difficult (some say impossible) to achieve while staying NA.. If you pay attention to EVERY detail and money isn't really an issue, you could do it with some help of the local gurus (pat g mamo etc).

The stock bottom can hold up to around 600Rwhp and that is where you better start saving your pennies for a new bottom end.

500hp is easy..

zacht

iTrader: (18)

500fwhp your saying right lemons? i agree, its kinda the new 300hp...lol...

lemons12

iTrader: (71)

Correct about that!

pauls99z28

iTrader: (32)

450 hp Is a more Doable/realistic goal i was told.

eatlead

You were told correctly. The money it takes to make a real 500 and have it be dependable would be better spent on a 408 short-block.

People wind engines up to the hilt and de-stroke due to class restrictions.

If you want 500 rwhp and have it be street-able.. you increase your cubic inches. Heck we've seen solid rollers make 540 but I wouldn't want it in my car. There is that formula floating around where the guru used lsx lobes ( the lobe of craze at the time).. I heard his engine blew up a few months later but I don't think you see that in the sticky

fastvet

iTrader: (2)

I've seen a couple of guys hit the high 400's with the new trick flow heads and a big cam with all the supporting mods. With everything that is coming out now, I say its doable. Patrick G made over 500rwhp on his T/A a little while back. Look up his thread.

Dom

iTrader: (2)

It's just a peak number. It's been done, just needs a big cam and a great set of heads. All the other supporting mods must be there. I'm not sure how big cams drive or behave on the street. It's all personal.

jaber911

500wrhp is possible

https://ls1tech.com/forums/generatio...heads-cam.html

pauls99z28

iTrader: (32)

Yes 500 is possible but for the average joe with limited resources 450 is more realistic.

deelong4002

iTrader: (8)

I think 500 NA would cost you every bit as much as say 550 with a procharger.

The cost difference between 450 and 500 on a 346 LS1 seems to be huge. 450 can be done with ported 243's and a big cam. 500 requires expensive aftermarket heads with custom camshafts and expensive valvetrains to meet the demands of the cam lift.

eatlead

Thats the one. I heard that engine blew not to much later after the thread was done and you dont see those lobes anymore do you?

tech doesnt always tell you the rest of the story

jaber911

http://www.airflowresearch.com/artic...le083/A-P1.htm

if you use tfs 215 you get +20 cfm
+15 to 20 wrhp mean About 500 wrhp
that was 2005 !!

pauls99z28

iTrader: (32)

Hey op what hp #'s you got now?

427TTA4

iTrader: (1)

450 seems more likely to me now. Dont know if ill reach it but I have set my mind for a set up Let me know If I can improve on something from the list below.

TSP PRC 215cc CNC heads
TSP MS4
FAST 92MM AND PORTED
KOOKS 1 7/8 headers....

What would be the best chamber size on the heads or keep it 62cc and on the cam What LSA 111 or 112??? Im asking you guys since I dont want to order something thats wrong and its always better having a second opinion.Once again thanks

fastvet

iTrader: (2)

stick with the 102mm instead of the 92mm. Get the 100mmMAF. UD Pulley. Talk to TSP and see whats the most that can be milled on those heads for the MS4. And some cutouts should put you near the 500RWHP that you are looking for.

fastvet

iTrader: (2)

Heres A thread from a while back. Remember all this was done with stock rear end. Oh, and this was done with the Tsunami cam which is about 4 degrees smaller in duration than the MS4

https://ls1tech.com/forums/dynamomet...e-results.html

LS1-NAVY

iTrader: (1)

it can be done but the combo will all have to be set-up and work perfect together

lemons12

iTrader: (71)

450 is simple.. With a setup like that, you will go beyond that. 500? Probably not with much tweaking.. With a stock clutch/rear/gears/etc you might be able to achieve it with those mods...
Spraying=112 N/A=111
Call TSP and ask them. That is their heads and their cam, they will know best. That is a KILLER setup.. Same heads/cam used on the record breaking stock bottom H/C camaro. I have my own opinion but I would think TSPs would be better, or at least I hope! TSP knows their ****!

desertLS1

iTrader: (8)

That set up should be nasty on your vette.
Forget dyno numbers that should get you in the tens with proper suspension set up.