klw1313

iTrader: (3)

Im going to buil a 408 Iron block, eventually turbo charge with my STS kit off my stock LS1. any body have an idea how i can get 700 horses out of it on just 8-10 PSI? i plan to go with mongoose stage 3 heads, custom turbo cam, and tune the crap out of it. any other inputs? thanks

Boostaholic

iTrader: (4)

Build your 408 at 8:1 CR

And unless you already have the STS kit, don't buy it, go with something like Phamspeed or Marko's new kit - something with a turbo up front, the chump change you save going STS isn't worth it.

BlackCamaroSS02

iTrader: (8)

yea i am with Boostaholic on this one...i used to have one sold it for a front mounted kit.

klw1313

iTrader: (3)

Yeah i already have the STS, its ok if yo wanna run a lil faster around town but i need more power. so build the 408 at 8:1? any special parts i should keep in mind, type of pistons, etc....

i am thinkin of selling the STS and getting the eliminator kit from LS1speed.com

klw1313

iTrader: (3)

where can i see these kits your talkin bout, phamspeed, or marko

Boostaholic

iTrader: (4)

The eliminator kit is a good kit also, I would get a eagle 4.000 crank, eagle rods, wiseco pistons with the correct dish size for 8:1 with your head CC size, hellfire rings, iron block 4.030 bore.

I had HPE build my short block, but if your getting a speed inc turbo kit they will probably cut you a deal with the block and turbo at the same time.

klw1313

iTrader: (3)

where can i find those other two kits your talkin about, how do they compare in price?

HPE in houston? they pretty good to deal with? reasonably priced?theyre not far from me.

Reject

iTrader: (24)

the marko kit is from Hi Flo Turbo, i want to get that one, they will be able to support up to 1000 hp with the gas and meth, and i think he said some were around a 5 grand or somthing, just search for marko,...thersa alot of threads of his stuff.

Slowhawk

iTrader: (12)

For only 700rwhp with a boosted 408 I would go with 9-1 compression or even 9.5-1 compression with box -stock AFR 225 Heads and a 224 Cam. Addan efficient 10-12lbs and you'll easilly blow past 700rwhp on pump gas

eviltwins

Ok, why? A 408 at 8:1 compression will make more power than a 12:1 347 with all else being equal, no contest. Building a 9.5:1 boost motor just gives him no room to upgrade and is flat out silly.

99SS-T

iTrader: (5)

I think he is saying that if ALL you wanna make is 700 then go a little higher compression so that off boost it still feels good. I know i know that it is a 408 adn they always feel good but if the car has 500 RWHP off the boost it will move ALOT better all the time.
To the original poster, there is no reason to spend the money to get a 408 for only 700 hp. Im close to makin 650 with my stock motor with out meth. If you just get rods and pistons adn the CR set to around 9.0 you will be able to get 700 out of it with no issue. If your respons is that you dont wanna havfe to sprzy meth to make the power ya wanna make, that is crazy. You wouldnt need to push much meth in at all and get quite a few miles out of a gallon. Whereas doing a 408 will cost ya a couple extra thousand. GL


John

eviltwins

A full point in compression is worth about 4% horsepower. So if a motor makes 500 RWHP at 9.5:1 you're looking at about 480 RWHP at 8.5:1

And let me ask you this, how much of that power are you using for putzing around town? Last time I checked a 200 HP V6 can move a heavy camaro around town fine, and the only time you're going to move into a zone where the higher horsepower helps move you quicker is when you're at half throttle or above, give or take, and at that point you're already making boost and the high compression becomes a moot point.

PurEvl

iTrader: (2)

i made 700 with 14 psi an 93 pump with a 346 sts gt70 and 9:4:1. Slowhawk built, been there and done it. I think that was his point. You can make 700hp easily with the 408.

ddnspider

iTrader: (26)

id go 8.5-9:1....he can still make well over 700rwhp with that CR which is basically the middle ground where most go when dropping the CR,not too low not too high.He could still see 15#s or more with a 8.5-9:1 CR.if ur dropping major cash like ur planning on get AFR or All Pro for the thicker deck.and i agree about ditching the STS,why work harder to make power???

Shane_G

iTrader: (6)

My 408 is at 9:1 and I plan on running about 15lbs through at least a 76mm if not a little larger.

ddnspider

iTrader: (26)

thankyou

Pro Stock John

iTrader: (34)

I would in general never go over 9:1, and I would shoot for 8.5:1 for most builds. Most of you guys want to limit how much race gas you run.

ddnspider

iTrader: (26)

NONE