fastcars95

iTrader: (9)

I'd like to stroke either my 5.3 or 5.7. Which block will allow me to go with the larger displacement and still be safe to boost.
Can I make a 383 ish out of a 5.3 iron block ?
Will the 5.7 be able to be a larger displacement then the 5.3 ?
I'm trying build the largerest displacement motor with the blocks I already have.
Thanks in advance

JakeFusion

iTrader: (7)

Not sure on the iron block, but I know you can take an aluminum 5.3 out to 3.905" pretty safely. You can run a 4.125" stroke in either case (not ideal as the cylinder liners aren't long enough and allow for rocking at the bottom), but that creates a 395cid engine. A 4.100" stroke would be a little better and would give you a 392/393 depending on bore (3.903/3.905).

96capricemgr

iTrader: (1)

looking for max displacement and boost suggests YOU should not be planning this yet.
Drop the quest for displacement.

fastcars95

iTrader: (9)

Ya I know. But if I go with something with a larger displacement I will order larger turbochargers.
Id like to build a strong bottom that will support my needs for years to come. I've been through a bunch of engines in the last 3-4years and thats got to stop.
I dont want to order these 6162s and then build a motor that will support the 6665s I want to run.
My plan is to order the larger turbos, build a strong bottom end, and run the heads I have now until I can afford to upgrade them to 350cfm+ heads.
I cant do it all at once and I dont want to wait till next year to finsh this car.

deerslayinrednek

iTrader: (8)

Most people will probably say to not go any bigger than a 4" crank with boost

96capricemgr

iTrader: (1)

why change the crank atall when looking for durability?

fastcars95

iTrader: (9)

I'm not sure about 2 6665s on a 347. It's a street car with a 6 speed. I don't want the boost to come on at 4500 rpm.

batboy

iTrader: (6)

The 5.3 can usually be bored out to 5.7 bore size. If so, then both blocks can be stroked equally. I'm one of those guys that say no more than a 4" crank on boost. So, 383 is about the limit on both. If you want more displacement, you need to find a 6.0 iron block and make a 408 out of it.

fastcars95

iTrader: (9)

I regret selling my 6.0L more and more. A 408 would be perfect. The only way to get a 6.0L block around here would cost me $1000. That would put me around or just over $5000 to build a 408 short block. Vs $3500 ish for a 383.

batboy

iTrader: (6)

Or buy an assembled 408 short block from Texas Speed (on sale right now for $3,550).

http://texas-speed.com/p-3541-tsp-40...ort-block.aspx

fastcars95

iTrader: (9)

Thank you very much.