LoTu5

Hi all, I've been hearing a lot of the increased cubic inches. What is the deal going from a 415 to 441? All aspects as it is something I might be interested in at a later date.

Thanks

zr-1 guy

can't see why you'd want to unless something happened to the 415

Dominic Sorresso

There are 2 441s here as part of the FBI along w a 427. They all run 10's.
Also using a "closed deck" design developed by AES.

http://aesracing.net/product_info_lt5.htm

LoTu5

Nothings happened to the 415.

It's always good to know more about what the LT5 is capable of.

LoTu5

Thanks for the link. Looks like they go to 450ci ?

Are there any durability or balancing issues ?

FU

Psst......go for an econo-stroker.

SAM/CH ZR-1

Well, Cliff. You won't know as long you don't try
I told you last time by phone about my engine project.

Sam

LoTu5

I'm trying to search out threads on the new found cubic inches Sam.

Always good to read up on this stuff.

Will email you later Sam.

Rkreigh

side loading and balance issues aren't worth the extra cubes

I think a big bore short stroke lt5 would be both more efficient and more durable

a 427 sounds good to me

Dominic Sorresso

Ron,

Ask BobG. A 427 sounds terrific!

DDSLT5

In theory, more cubes = more power. In practice, a max port 415 makes the same power as a 427 and as a 441. I had aspirations of upgrading my 415 at one point, but having lived with 585 rwhp, I realized that this is a ton of hp for a street driven automobile, and the projected power gain was minimal at best.

Finally - no matter what the cubic inches, make sure you have the compression that the engine can handle - at LEAST 12:1, if not 12.5:1. These motors make huge power and with the efficiency of the combustion chamber, the LT5 can handle a ton of compression.

Have fun Cliff!

SAM/CH ZR-1

Does these 441 cars run with a manual or automatic transmission?

Sam

FU

One's a manual. The other is an automatic 4L60E.

LoTu5

Will do Dwight. What cams are you using ?

LoTu5

Econo-stroker ?

DDSLT5

When my engine was assembled, I went big on all counts. I've got stage IIIs intake and exhaust. If I were to do it again, I'd do what Frank is doing - 441 cubes, big compression, Stage III intake and Stage II exhaust. Having said that, my engine pulls like a freaking freight train to 7600 rpm - absolutely NO drop if power to that rpm level, and if I were crazy enough to raise the redline, it would pull to 8000 rpm with no problem. It truly is an amazing engine - I really love listening to it sing!

Graybeard ZR1

Very interesting about that compression, Doc. Was there a lot of tuning necessary to keep that knock sensor from dialing back the advance?

DDSLT5

My 415 is 12:1, which is very common for a built motor. All the 368s/385s/402s/415s that I know of run 12:1, and knock is simply not an issue. I know of another 415 that ran 12.5:1, and it made big numbers too. Are there risks? Sure - I got some bad gas on the way back from BG a few years back and popped both head gaskets - no big deal - I pulled the motor and replaced 'em both. Always use name-brand gasoline!!!

Dominic Sorresso

LT-5 is not knock limited. Knock occurs at torque peak, beyond that rpm you can crank up the advance and the motor will just make less power.
I would suppose that with greater compression you'll need less advance.

FU

A little alcohol-water injection at WOT will cure most detonation and pick up a few more H/P during the process

Oh econo-stroker , see Robert (Polo1)