Rhino79

iTrader: (7)

Ported heads and PRC Dual Springs, cam is 233/239 .595/.603 113LSA. Power is just flaat past 5600 till 6200 or so and then drops off. I think the motor just needs more air than the truck style can provide in the upper rpms.

nastyta

iTrader: (1)

I got a callie crank and compstar rods mahle pistons arp everything plan on spraying 180 shot plate system nx, building a 408 i would recomend trying to get away from ne thing stock if u plan on spraying.....im running 255l wal. full racetronix fuel sys. with 42lbs svo's

jlrz28

iTrader: (7)

Anyone ever tried to run a 408 on 8-9.5:1? How much power is normally left on the table that could be had from 10+? Not trying to hijack but just though it would be nice to run on cheap stuff or medium stuff.

Lurius

iTrader: (7)

Been kinda wondering this myself. If i only lost like 50hp from going to 8.5:1 or 9:1 vs 10:1 then i would go that route, leave it open to FI later on.

-Lurius

PS: I looked at eagles site, and they have a prebalanced 408 kit with je pistons for 2600$ on jegs.com Might go that route.

Cam02ss

iTrader: (8)

I'm basically wondering the same thing. Texas speed is sending me a couple 408 estimates and are telling me if i'm going to spray a 200 shot then i don't want anymore than 11:3 compression. Thunder Racing on the other hand is telling me no more than 9:5 or 10:1.

You guys running the 12:1 compressin,etc. How is it on the street? I believe one of you said you are running pump gas with it? Is that the usual case with that high of a compression? Thanks

slow trap

iTrader: (22)

when i finally get the motor in i plan on spraying my 11:7 cr 408 on pump gas.the dcr is what you need to worry about more than scr.

2c5s

iTrader: (11)

11.2 -13 pistons, .008, .041 and 62 chambers

1FST99Z

iTrader: (9)

JE pistons 9.5:1 preparing for a supercharger.

JL ws-6

iTrader: (50)

Well I'm not running a 408, but I am running an alum 402. 12.8 to 1 compression, and it runs on 105 unleaded. I do plan on spraying it, I will start off with a 125 hit, but I'm sure it will be 2 stages of that much before I'm thru.

ls1408cp

iTrader: (37)

my 408 is 12:1 I run only pump gas but I have a big cam to bleed off pressure

b727pic

iTrader: (1)

JE FSR -29CC, Dart 225's, .040 Gasket, Zero Decked.

oct03gto

iTrader: (15)

How about RWHP numbers? I am in the process of buying parts for my 408 build up. Iron block, and forged internals. Staing around 11.0:1 to 11.5:1. Will be running ETP 240 heads. I think I will gernade my six speed for this one.