Highest rwhp from NA fbody???
Thread Starter
Teching In
Joined: Nov 2018
Posts: 11
Likes: 4
From: Newfoundland
Highest rwhp from NA fbody??? Just wondering what people think or know the highest rwhp from a stock 346 N/A build in an fbody is?? I know all the highest numbers like 530-540 were in a c5. But what about in a 4th gen fbody?
Cartech was making well over 500 on some VERY heavily ported 243s back in 08 or 09. Im sure its very near mid to upper 500s with aftermarket heads and intakes but they were undriveable on the street, so build for what you are going to do, not what you want. Shooting for above 500hp is going to cost you ALOT of bottom end and peak tq due to the cubic inches and max cr you can run. even bumping E85 will still cost you.
Originally Posted by Mavn
Well your answer is here on this forum hahaha go check out Darths Build
Originally Posted by 519camarobrad
Just wondering what people think or know the highest rwhp from a stock 346 N/A build in an fbody is?? I know all the highest numbers like 530-540 were in a c5. But what about in a 4th gen fbody?
Build thread is in my sig. it is a LLLOONNGG one.
Thats what SHE said
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TECH Fanatic
Joined: Aug 2009
Posts: 1,845
Likes: 255
From: Coast of San Mateo County Between Pacifica & HMB
Start with Mast Small Bore LS3 Heads, 11.5-12.0:1 Compression, FAST LS3 W/Mid-Length Runners,
LLSR From Cam Motion specced by Darth LOL. and all the little details.
Good Luck!
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Originally Posted by 519camarobrad
Nice, 538/441 Darth v8r . I'm gonna try my best to beat your numbers ! Congrats on your accomplishment, is there a post that shows all your mods?
Be cool if you did beat it. Mixed emotions for me though. Lol
Originally Posted by NAVYBLUE210
Wont be cheap and will need to spin 7500 RPM.
Start with Mast Small Bore LS3 Heads, 11.5-12.0:1 Compression, FAST LS3 W/Mid-Length Runners,
LLSR From Cam Motion specced by Darth LOL. and all the little details.
Good Luck!
Start with Mast Small Bore LS3 Heads, 11.5-12.0:1 Compression, FAST LS3 W/Mid-Length Runners,
LLSR From Cam Motion specced by Darth LOL. and all the little details.
Good Luck!
That thing really was a badass 346.
Thread Starter
Teching In
Joined: Nov 2018
Posts: 11
Likes: 4
From: Newfoundland
I got 491 and 435 out of the mish mash of parts i put together but as you can see it falls off hard at 6400rpm which is from the bad porting on the used fast 90 i bought and installed. Its coming off and im putting on an msd atomic air force that will be ported by tony mamo. Along with a bunch of other stuff to make it rev happier like hollow stem valves, short travel lifters, an electric water pump etc, hopefully itll be up around darth v8r with 538/441
The main issue is, all dynos read differently and the numbers can be off quite a bit from one to the other.
I may have an interesting setup early next year to toss in this thread though.
I may have an interesting setup early next year to toss in this thread though.
11 Second Club
Joined: Jan 2003
Posts: 1,000
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I live in Australia and over here we had a lot of ls1's sold new in Holdens. Thousands of them, and now the engines are everywhere for $500-$1000 like your 5.3 truck engines are over there. Because of our current crappy exchange rate and taxes and shipping costs are higher than ever, your parts now end up costing double for me over here. So I'm going to be trying max effort out of 5.7 ls1s because I have 4 of them already. I paid $200 for one of the long motors that was a perfect runner.. it broke a valve spring (didn't drop a valve) and it was ticking.. that's it. And the owner wanted to throw his money away and get a new engine.
I have small bore ls7 heads and T&D rockers from a Daytona nascar and that will be my next mod.. remove the stock ls1 heads and fit these with an ls7 intake. I just wish I didn't have to cut valve reliefs to run any kind of decent size cam. I also have a Comp 243/250 here I can use that made 500rwhp in an ls3.
Originally Posted by bnastystuntz
i bet u could get upper 500 dependin on setup.... bump the compression ration 13:1 Good set of heads ...How u thinK TEXAS SPEED got that stock bottom end record .
10 Second Club
Joined: May 2009
Posts: 3,427
Likes: 226
From: over dere
As far as streetable and on the Stock bottom Darths 540 rwhp will be hard to beat. He could have beat it imo by 10 or so. His short block was tired lol. Was an awesome build.
take the 100% streetable and make it stock CI but not Stock bottom end and it’s a different ballgame
take the 100% streetable and make it stock CI but not Stock bottom end and it’s a different ballgame
Originally Posted by big hammer
As far as streetable and on the Stock bottom Darths 540 rwhp will be hard to beat. He could have beat it imo by 10 or so. His short block was tired lol. Was an awesome build.
take the 100% streetable and make it stock CI but not Stock bottom end and it’s a different ballgame
take the 100% streetable and make it stock CI but not Stock bottom end and it’s a different ballgame