VTC_WS6

iTrader: (9)

We all know the main culprit in going with the iron block LQ based setup is of course, weight. Looking past that however, are there any other tangible benefits to remaining with aluminum vs. going the more economical route and building a LQ-based stroker? My primary concern is heat transfer between the iron block and the aluminum heads, differences in tensile/torsional rigidity and whether or not that ever plays a role in things like head gasket seal integrity.

As you can probably gauge by this, I'm undecided between going with a iron-based 408 or an aluminum based 402 and of course the additonal ~$1500 does weigh into the thought process.. what are your $.02?

Tainted

iTrader: (9)

the iron would be better for high nitrous builds or boost, but aside from that theres nothing I can think of.
Get the iron block, its way cheaper and easier to find

batboy

iTrader: (6)

An iron block is inexpensive, and in some cases, the weight penalty is offset by the increased power available in the iron block due to reduced blowby and ballooning, and the ability to get a tighter squish due to reduced expansion.

mark21742

I have no problem spinning my iron 408 with 12.5:1 compression to 8,000 rpms

brians91formula

iTrader: (12)

I plan on going to an iron 408 as well. One because of the price difference and two because its just a fun street car. If weight is a huge concern on the front end of your car you could relocate the battery and opt for a lightweight K member.

I know people who have switched to iron and they said they cant feel the difference when driving the car. I'll be putting in heavier springs and shocks to accomodate the difference though.

umair

Aluminum cracks easily and is limited to boring 2-3 times. Iron is hard to crack, heavyduty and can be bored many times