What is the biggest possible displacement an LT1 can become? I heard somewhere around 407ci. True?

 

I think 422 is the largest. I've seen a few LT1's stroked to a 406.

 

I've seen 431... but it was a welded/relieved/sleeved block

 

you can buy the kit for a daily driver 427.

 

422.... 431.... 427.... Can you give me a link to any of these?

Largest LT1's I have seen are the two 421's built by Mark Montalvo....

4.030 X 4.125 stroke = 420.93ci
4.090 X 4.000 stroke = 420.42ci

Better have a big limit on the ol' credit card.

 

i got 427 and use it as a daily driver
block is sleeved, filled, releaved, x-rayed

4.12 bore, 4.0 stroke

11.5:1 compression

small cam - to pass CA smog

-chad

 

Fred -- I had a magazine, and there was a Lingenfelter-built LT1 vette with 427ci.

 

http://www.moreperformanceinc.com/cranks.htm

heres one for the ls1.

 

damn..........how long have you been driving it? ive heard problems with sleeved blocks

how much did the machine work cost, and what crank are you using?

 

I believe a aftermarket block just came out for the lt1 forgot th company that makes it but they were talking about a 454 lt1 capability.

 

What?!?! You heard about this and failed to take notes? Get a phone number? A mailing address? Anything?

Arrrrggggghhhhh!!!!

 

it was posted on the board........i think it was just a rumor, like someone heard from someone who heard from someone......world products might make one.

 

Chad, curious, why go to such trouble with the block for the displacement, and then put in a hotcam? I would figure it to have easily over 475 rwhp with a larger cam. I bet it drives like a stock camaro tho. Do you have any dyno sheets you can post?

 

no its not a "rumor" there is a block out and I got this info from a magazine that was testing it. I think someone posted about it but its all true. I will do a little research and get back to you guys.

 

my dyno specs from my most recent dyno tune is in my signature

no recent track times... any tracks in the santee area??

can post dyno sheet after my home computer is replaced (were my scanner is at, im using computer @ work now)

needed small cam due to CA smog checks, got pulled over last week, and they inspected it

-chad

PS: i can get more then 475 RWHP with a bigger cam
my friend has a 355 w/ 10:1 compression with a BIG cam (cc306 i think) and head work/LT1 Edit, and basic mods: 420RWHP 380Ft. Lbs. Tq.