Boring Cylinders

**Kolton Lock** · 06-18-2012

lol sounds like they are boring...

but i mean to bore a cylinder in this car, would it be possible to make it big enough that you go from a displacement of 3.8L to 4.5L?

**ctracer** · 06-18-2012

i dont think you can do that big of a displacement change.
however, i do see people bore out their old grand national blocks (3.8) to a 4.1L. i dont see too many amazing results from that though.

**machinegunsquid** · 06-18-2012

to a 4.5L? How any why did you come up with that number?

On stock stroke, no way. The biggest would be with a stroker kit, and bored over, getting you to 4.2L. It'd be awesome, but expensive as hell.

**Slick2500** · 06-18-2012

The stock bottom end is fine and boring out the cylinders does not give enough of a performance increase to justify the cost. /end thread

**Kolton Lock** · 06-18-2012

hmmm. it makes me curious because i had 4.5L written on both my cylinder head covers... i havent taken them off yet to see due to other car problems and me being busy.

**blueguy** · 06-18-2012

LOL, that's funny.

4.5 liters is ricer math.

Swan Racing makes a 4.25 liter stroker kit for the 3.8, ala...quite a few G's.

Swan Racing 3800 Stroked Engines

**Kolton Lock** · 06-18-2012

well like i have mentioned previous, i had a pretty sloppy engine swap and previous owner lol

**blueguy** · 06-18-2012

If the previous owner was sloppy...I'm sure he didn't buy a made up 4.5 liter stroker kit.

**Kolton Lock** · 06-18-2012

So he just wrote on it for Sh!ts and giggles? lol

**blueguy** · 06-18-2012

Sure.

I'll draw a Zebra on the next 3800 I work on.

**Kolton Lock** · 06-18-2012

do you think maybe he was an idiot and wrote on it so he knew how much oil to put in?!
since it takes 4.5 quarts

**siLversLeigh** · 06-18-2012

Looking to run some 2.250/1.800 valves or what?

**2004GrandPrixGT1** · 06-18-2012

Thatd be some huge a$$ pistons and some long a$$ rods. Id guess the engine would make it about 1320 ft... maybe lol. Nahh the cylinders wouldnt have enough material between them and your pistons would have to be very shallow. Id bet it was just the oil number or if it was swapped it could have been swapped in april of 05 lol

**Kolton Lock** · 06-18-2012

It wouldn't have been swapping date, cause it was swapped in 07.

I'm assuming he was just an idiot and thought liters were quarts

**matt5112** · 06-18-2012

30 thou and the block is done.

Pistons are already very close to one another anyways.

**bmx6454** · 06-19-2012

oh my... a .7l jump is quite impossible on this block lol, or i think most blocks... for that amount of money, why not just upgrade the crap out of everything else to get power??

**machinegunsquid** · 06-19-2012

^ You can bore a SBC 350 .060 over and put in a 400 crank and have a 414CI engine. 350=5.7L 414=6.8L So you grab 1.1 liters right there. And that's only a small block, some even push the bore .080 over, but then the cyl walls are too thin to handle as much power.

**bmx6454** · 06-19-2012

Originally Posted by machinegunsquid

^ You can bore a SBC 350 .060 over and put in a 400 crank and have a 414CI engine. 350=5.7L 414=6.8L So you grab 1.1 liters right there. And that's only a small block, some even push the bore .080 over, but then the cyl walls are too thin to handle as much power.

that sounds very expensive lol