i would like to destroke ym lt1 to a 327. has very many people done this? with a nice solid roller cam bigger valves headers and a port i would make decent power. Im looking form a higher rpm Hp not so muhc a torque sum bish any commenst?
greg

 

There have been a few threads on "destroking"... a search on "destroke" will turn up a some of them. An example:

http://web.camaross.com/forums/showt...light=destroke

 

Well... if your looking to cut back torque that's the way to do it I guess. Just remember this:

- The LT1 PCMs top out around 7200 rpms.
- Connecting Rods Bolts are the highest-stressed part of the whole car... and RPM's are what kill 'em... not hp. This is quick way to dissasemble an engine

It's totally doable... but a 383, 388, or 396 that turn to 7000 rpms will eat you alive rev for rev.

You could hit 8000+ with exotic rods/bolts/valve-train and a $3000+ aftermarket computer... but is it worth it in terms of $$/hp? In that light a $9000 stroker looks like a steal in my books.

 

the only time when it makes any sense is when you have a maximum displacement rule or a pound per inch rule Keep this in mind, how often do you see MINIMUM displacement rules in racing classes?

 

well the plan isnt a na 327 plan was a Twin Turboed 327 wouldnt turn it more then 7grand
greg

 

Stick with a 355 then, cheaper to get the crank. A 1 piece rear main seal 3.25" stroke crank is not common, but a 3.48" stroke one is.

Bret

 

destroking is a cool idea, but from what I have read is just not gonna be worth the $$$ getting all those exotic parts in there compared to building a bigger inch motor that will make more power and cost less.

 

Ok thanks for the input guys i will just stick with a Boosted 355 thanks for all your input
greg

 

It may give a better perspective if viewed from the other side. The 350 is actually a stroked 327. This done for more torque. The 327 was a stroked and bored 283, again a step UP. The 327 was a great alternative when compared to the 283. But to again visit that displacement, with the 350 a reality, would be a step down, for the various reasons given above.

 

and a 400 is basically a bored and stroked 350

 

By that logic so is a 572. A 4.125" bore is a bit more than than a typical 350 can hope for without floating pistons.

Regardless of the boring impossibilities, the 400 also has different bearing sizes.


Now if you were to look at a Little-M, Motown, Bow-Tie, Rocket-block, or any other SBC aftermarket block you could go with any combination of bearings, deck hieghts, cam heights, etc... and "technically" it would still be a SBC... but I'd hesitate to call any of those just bored and stroked 350's either.

 

a 572 could be called a bored and stroked 396

I realize there are a few differences with the SBC 350 and 400, but externally, can you tell the difference?

 

Yep... look at the dampener.

 

what if they put an aftermarket dampener or internally balanced the 400?

 

The 400 is based on a different casting, with different journal sizes, and siamiesed cylinders. Consequently, I do not consider the 400 to be a progression (stroked/bored) of the previous sbc engines. If the 4.0" oem bore sbc could be physically overbored (forget about safely) to 400 specs, I might reconsider. AFAIC, ain't gonna happen.