badass99ss

iTrader: (17)

FIRST! Yes I have tried the search function, and have read threw MANY post.
However I still find myself stuck between a 402 and a 408, and would like your help to make a decision.

My plans are to use my current mods in my sig for the time being, but im going to go to a F1-A W/ a FMIC. Im already having an issue with fuel, so I know that will have to be dealt with first. Im hoping to hit ~15psi on this build, and dont see a reason why I wont. Car will be used on the street, some road events, and some occasional drag visits.

To me there doesn't seem to be a huge price difference between the two. I believe the weight difference is somewhere between 70-90lbs, and Of course the iron block will be stronger but is it necessary for 700-850rwhp.

Sorry for making another "this or that" thread, but I have been dwelling on this for quite some time. I have read threw many post, but could not find anything that made me feel confident in my decision. Can anybody offer any other ideas that will help me make a decision?

Thanks
Troy

red83

iTrader: (64)

stay aluminum. it will handle 15lbs all day long and the next day and so on.

conan

iTrader: (5)

+1 I like the aluminum over the iron block too. Also check out LPA. I have been dicking around with hot wire kits and kenny bell boost a pumps and I'm still loosing fuel pressure at 12#'s of boost. I'm sending my pump off to lonnie this winter for a dual pump setup. Hopefully this will be the last time I drop the fuel tank for a while I think you'll need some bigger injectors to feed a 400+ ci moter.

1320

iTrader: (6)

I dont get it......a 402 is a 408........the only reason you build a 408 is if you have to bore the cyclinder, due to previous use.

The difference between iron and aluminum is about 94lbs, +- 1 lb. The difference between a 402 and a 408.......about 0.10 of a pound.

BTW, boost is only the measure of the ristriction of the intake. You should never shoot to run a certain boost. Other then the lowest to achieve the goal. 15 psi with one head is 150 hp lower then another head at 15 psi.

Controlling knock is ussually easier on smaller bores too, so the 402 is theoretically better, but that depends on your knock control methods way more.

BLNLS1/RX7

iTrader: (2)

Exotic Performance Plus is putting together a 408 Iron block with all forged internals and I am hopefull to get around 15 lbs. of boost.The iron block is bullit proof and I should be able to run it all day long with no problems. My vote is for the IRON BLOCK.

EPP

iTrader: (22)

We had good success with both iron and aluminum blocks. Perhaps my engine has held together through several hard rear bumper wheelies because it is an iron block, but a well built LS2 block will handle a lot of power. Check out this LS2/402 with an F-1A.
http://www.exoticperformanceplus.com...Car.php?car=29 Bob

badass99ss

iTrader: (17)

I actually have read through this build, and every other on your site for that matter. Its builds like this that keep me on the fence. At this time im thinking about going with the Iron block simply for the peace of mind, and it's a little easier on the wallet. There are ways to counter the weight of the iron block. Bob, I think I might be giving Dustin a call to see what we can conjure up.

Troy

black98ws6ta

iTrader: (77)

Go aluminum, it will make the power you are asking out of it, and it is much lighter.

98Z28MASS

iTrader: (6)

LS2 aluminum 402.

badass99ss

iTrader: (17)

If you were to have the exact same set up on both the 408 and 402, what would the power difference be if any? Would the extra cubes make a difference?

Troy

black98ws6ta

iTrader: (77)

Hardly any difference.