View Poll Results: H/C 346 or 402/408 Short Block NA???
H/C 346
13
28.89%
402/408 Short Block
32
71.11%
Voters: 45. You may not vote on this poll
H/C 346 or 402/408 Short Block NA???
03-19-2007, 06:38 PM
#1
Banned
Thread Starter
Join Date: Jun 2005
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
H/C 346 or 402/408 Short Block NA??? Reading about some H/C 346 almost at 500RWHP raised the question, should one get a 402/408 short block or H/C combo for NA.
I know the short block will need supporting mods: heads, cam, intake..etc
Goal is to have a 450+RWHP NA for street/strip?
Thoughts & opinions, please.
Don't forget to vote, above.
I know the short block will need supporting mods: heads, cam, intake..etc
Goal is to have a 450+RWHP NA for street/strip?
Thoughts & opinions, please.
Don't forget to vote, above.
Last edited by bluecamaroz28; 03-19-2007 at 06:59 PM.
03-19-2007, 06:53 PM
#2
TECH Regular
iTrader: (1)
Join Date: Apr 2006
Location: albany ny
Posts: 480
Likes: 0
Received 0 Likes
on
0 Posts
you can get 500 rwhp, but I'd like to say the same set up on a 402, I think it would be the best combination of power with a ton of torque to kick you in the butt. If you can get 500rwhp from 346ci then you should be able to get about 575 out of a 402 with the same set up, based on a simple hp/ci and guesstimating for a loss of efficency because of the longer stroke (which increases dcr) and heavier rotating assembly.
This is what I would do if I had the money
AJ
This is what I would do if I had the money
AJ
03-19-2007, 07:07 PM
#5
Banned
Thread Starter
Join Date: Jun 2005
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Sam-eye-Am
How many 346ci 500rwhp setups have you seen in person 
?
? https://ls1tech.com/forums/dynamometer-results-comparisons/661579-trickflow-vengeance-racing-521-464-dyno-graph-inside.html
ECS H/C 500rwhp package
https://ls1tech.com/forums/dynamometer-results-comparisons/592965-ecs-c5-z06-stock-exhaust-makes-504-rwhp.html
Originally Posted by Sam-eye-Am
The 408 is a no brainer over a 346 that will make 450rwhp in the real world.
Thanks for voting, guys.
03-20-2007, 07:05 AM
#6
TECH Addict
iTrader: (22)
Join Date: Sep 2004
Location: tennessee
Posts: 2,639
Likes: 0
Received 0 Likes
on
0 Posts
most of the 500rw 346 engines have to be spun to the moon to hit anywhere near 500rw and their peak tq is usually @ 5200-5300 rpms.down low they are seriously lacking compared to a longer stroke/bigger cubed motor.unless the intake track is bottlenecked the 408 will be up on power everywhere.
Trending Topics
03-20-2007, 01:17 PM
#8
LS1TECH Sponsor
iTrader: (4)
Join Date: Apr 2002
Location: RI
Posts: 5,650
Likes: 0
Received 0 Likes
on
0 Posts
h/c will get you there but more cubes will make alot more UNDER the curve and drive alot better . if the budget is tight stick to a 346 setup. if not go bigger cubes 
03-20-2007, 09:21 PM
#10
yeah go bigger if money is not an issue. go 408 iron and if u change ur mind about bein N/A then boost it or spray it cuz those iron blocks can take a beaten but then again a 402 alum. can handle some power too and its lighter.
03-22-2007, 06:52 PM
#11
i have done both and wish that i would have saved the money on the H/C and used it for better parts for my 402.....
go big u will love it...i do the extra low end makes it was easier to DD.
go big u will love it...i do the extra low end makes it was easier to DD.
---- 408
03-23-2007, 11:27 AM
#13
Banned
iTrader: (19)
Join Date: Jun 2005
Location: chitown
Posts: 1,879
Likes: 0
Received 0 Likes
on
0 Posts
i say for the money go h/c - but if you can swing the extra dough to buy a new block and rotating assembly, then go for an ls2 402. i didn't like the extra weight of my iron block in my orange car.
you can hit your 450rwhp goal w/ a 402 that idles like stock... (i've done it).
but i like the idea of doing more with less, and i also like the idea of not sinking a butt-load of money into a shortblock. my opinion would be to stick with just a H/C combo. if you want more for the track, throw a 150 shot on top of it.
you can hit your 450rwhp goal w/ a 402 that idles like stock... (i've done it).
but i like the idea of doing more with less, and i also like the idea of not sinking a butt-load of money into a shortblock. my opinion would be to stick with just a H/C combo. if you want more for the track, throw a 150 shot on top of it.
03-23-2007, 06:09 PM
#14
here is an idea....???
take the money you were gonna use on the H/C for close to the same you can get a short block stroker (maybe not a LS2 BUT) and reuse your heads and intake. get a used cam anything that will work with you stock heads (or get springs and a used cam that will match the lift). for now. then save for a H/C package that you real want.
this way you will get more power and TONs more TQ than you have now and you can add to it later and have more time to save for awesome parts like FAST 90/90 and AFR 225s the good stuff ya know.
if i had to do it again i would do that.
take the money you were gonna use on the H/C for close to the same you can get a short block stroker (maybe not a LS2 BUT) and reuse your heads and intake. get a used cam anything that will work with you stock heads (or get springs and a used cam that will match the lift). for now. then save for a H/C package that you real want.
this way you will get more power and TONs more TQ than you have now and you can add to it later and have more time to save for awesome parts like FAST 90/90 and AFR 225s the good stuff ya know.
if i had to do it again i would do that.
03-23-2007, 07:26 PM
#15
Banned
Thread Starter
Join Date: Jun 2005
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by imslow
i say for the money go h/c - but if you can swing the extra dough to buy a new block and rotating assembly, then go for an ls2 402. i didn't like the extra weight of my iron block in my orange car.
you can hit your 450rwhp goal w/ a 402 that idles like stock... (i've done it).
but i like the idea of doing more with less, and i also like the idea of not sinking a butt-load of money into a shortblock. my opinion would be to stick with just a H/C combo. if you want more for the track, throw a 150 shot on top of it.
you can hit your 450rwhp goal w/ a 402 that idles like stock... (i've done it).
but i like the idea of doing more with less, and i also like the idea of not sinking a butt-load of money into a shortblock. my opinion would be to stick with just a H/C combo. if you want more for the track, throw a 150 shot on top of it.
It's like $3000 more for 408 long block, not in budget.
03-23-2007, 07:36 PM
#16
Banned
Thread Starter
Join Date: Jun 2005
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by camarokid94
here is an idea....???
take the money you were gonna use on the H/C for close to the same you can get a short block stroker (maybe not a LS2 BUT) and reuse your heads and intake. get a used cam anything that will work with you stock heads (or get springs and a used cam that will match the lift). for now. then save for a H/C package that you real want.
this way you will get more power and TONs more TQ than you have now and you can add to it later and have more time to save for awesome parts like FAST 90/90 and AFR 225s the good stuff ya know.
if i had to do it again i would do that.
take the money you were gonna use on the H/C for close to the same you can get a short block stroker (maybe not a LS2 BUT) and reuse your heads and intake. get a used cam anything that will work with you stock heads (or get springs and a used cam that will match the lift). for now. then save for a H/C package that you real want.
this way you will get more power and TONs more TQ than you have now and you can add to it later and have more time to save for awesome parts like FAST 90/90 and AFR 225s the good stuff ya know.
if i had to do it again i would do that.
Well, the cost of the 346 H/C in my budget can get me a 402 or 408 short block. I have LS6 intake and 224/230 Comp Cam in my 346 engine that I can reuse with stock 241 LS1 heads. However, I think it will perform worse than 346 H/C with this setup.
Another question in mind is, if I go 346 H/C right now then in future upgrade to a 402/408 short block, will the TFS 215 heads from the 346 H/C work with the new short block? I still can use the FAST90/90 from the 346 H/C and maybe the camshaft, too.
03-24-2007, 12:12 AM
#17
ok well maybe the heads but u wlll wanna sre think the cam with the compression ratio. just do the 408 in a 11.5. to.12:1 ratio and then any good cam and head will work grat. and a fast 90 90 will only help
03-24-2007, 01:45 AM
#19
Originally Posted by bluecamaroz28
That's an interesting idea.
Well, the cost of the 346 H/C in my budget can get me a 402 or 408 short block. I have LS6 intake and 224/230 Comp Cam in my 346 engine that I can reuse with stock 241 LS1 heads. However, I think it will perform worse than 346 H/C with this setup.
Another question in mind is, if I go 346 H/C right now then in future upgrade to a 402/408 short block, will the TFS 215 heads from the 346 H/C work with the new short block? I still can use the FAST90/90 from the 346 H/C and maybe the camshaft, too.
Well, the cost of the 346 H/C in my budget can get me a 402 or 408 short block. I have LS6 intake and 224/230 Comp Cam in my 346 engine that I can reuse with stock 241 LS1 heads. However, I think it will perform worse than 346 H/C with this setup.
Another question in mind is, if I go 346 H/C right now then in future upgrade to a 402/408 short block, will the TFS 215 heads from the 346 H/C work with the new short block? I still can use the FAST90/90 from the 346 H/C and maybe the camshaft, too.
you need to buy heads either way. choking a 408 out with stock 241 heads isnt a great plan.
whats the budget?
03-24-2007, 08:06 AM
#20
Banned
Thread Starter
Join Date: Jun 2005
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 99blancoSS
how much do you have to spend is the question.
you need to buy heads either way. choking a 408 out with stock 241 heads isnt a great plan.
whats the budget?
you need to buy heads either way. choking a 408 out with stock 241 heads isnt a great plan.
whats the budget?