bore it or stroke it?
TECH Junkie
Joined: Dec 2001
Posts: 3,242
Likes: 0
From: Lakeland, FL
basically with an all bore your peak power will be higher than and equivalent stroker but the stroker will have higher torque. The all bore will also be able to rev higher.
Advantages all bore.
higher reving
more hp
Disadvantages
possibility of a dropped sleeve on a aluminum block
if you get an iron block the cost of the iron block
Need to have heads re-worked to work with bigger bore size
Stroker
Advantages
More tq than an all bore of equivalent size.
strength of forged crank
can use current ported heads if you already have them.
Disadvantages
cost of crank
lower reving
lower hp than equivalent bore.
Advantages all bore.
higher reving
more hp
Disadvantages
possibility of a dropped sleeve on a aluminum block
if you get an iron block the cost of the iron block
Need to have heads re-worked to work with bigger bore size
Stroker
Advantages
More tq than an all bore of equivalent size.
strength of forged crank
can use current ported heads if you already have them.
Disadvantages
cost of crank
lower reving
lower hp than equivalent bore.
All bore = more for drag racing due to what Mike K was saying with the hp peak being a little higher than the stroker. EX: 490hp 440tq
Stroker = higher overall torque at a lower rpm range. This is ideal if you like to shift on the street lower in the rpm range or if its not going to see much track time. EX: 480hp 460tq.
So it comes down to what your desire for more power is: is it for the quickest ET's possible, or is it for more low end grunt on the street.
Stroker = higher overall torque at a lower rpm range. This is ideal if you like to shift on the street lower in the rpm range or if its not going to see much track time. EX: 480hp 460tq.
So it comes down to what your desire for more power is: is it for the quickest ET's possible, or is it for more low end grunt on the street.
On The Tree
Joined: Jan 2004
Posts: 151
Likes: 0
From: albany, new york
Originally Posted by The Alchemist
All bore = more for drag racing due to what Mike K was saying with the hp peak being a little higher than the stroker. EX: 490hp 440tq
Stroker = higher overall torque at a lower rpm range. This is ideal if you like to shift on the street lower in the rpm range or if its not going to see much track time. EX: 480hp 460tq.
So it comes down to what your desire for more power is: is it for the quickest ET's possible, or is it for more low end grunt on the street.
Stroker = higher overall torque at a lower rpm range. This is ideal if you like to shift on the street lower in the rpm range or if its not going to see much track time. EX: 480hp 460tq.
So it comes down to what your desire for more power is: is it for the quickest ET's possible, or is it for more low end grunt on the street.
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On The Tree
Joined: Jan 2004
Posts: 151
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From: albany, new york
Originally Posted by VINCE
No Problem. Mine should spin to 7000rpm when its done.
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Originally Posted by ITSovr4U
APE is putting mine together right now. And absolute is doing the stage 3 6.0 heads for me. Hope to have it all at my door step in th next3-4 weeks. I will post #'s when it is done. I will be spraying also. Have hopes of getting into the 9's.
Launching!
Joined: Jan 2002
Posts: 252
Likes: 0
From: ONTARIO/CANADA
If ringlands need to be dropped, negative effective dome volumes are desired or longer rods to play with rod ratios are required the shorter stroke and bigger bore will make things easier.
I know there is a disadvantage to spending more money to prep a "big" valve set of heads but this is really the big advantage of the larger bore. You now have the abillity to utilize more airflow in the cylinderhead like maybe the big valve AFR's or even a set of heads that will only fit on a big bore like the C5R's
The one disadvantage of a dropped sleeve can be removed as a disadvantage if you purchase a block that doesn't drop sleeves
I think the only sub 400ci NA engine in the 9's is George Coffe's all bore 382, correct me if I am wrong?
They are both great engines
I know there is a disadvantage to spending more money to prep a "big" valve set of heads but this is really the big advantage of the larger bore. You now have the abillity to utilize more airflow in the cylinderhead like maybe the big valve AFR's or even a set of heads that will only fit on a big bore like the C5R's
The one disadvantage of a dropped sleeve can be removed as a disadvantage if you purchase a block that doesn't drop sleeves
I think the only sub 400ci NA engine in the 9's is George Coffe's all bore 382, correct me if I am wrong?
They are both great engines
Launching!
Joined: Jan 2002
Posts: 252
Likes: 0
From: ONTARIO/CANADA
Originally Posted by VINCE
Joe Overton is running 9's NA. 388CI LT1.
Maybe someone should try a 3.875 stroke with a 4.060 bore, there are a few LT1's running strong with this combo.
On another note look at 500 inch pro stock engines, BIG bore/ short stroke and always complaining they can't get enough cylinderhead!! have you guys seen a 600+ cfm pro stock head
On The Tree
Joined: Jan 2004
Posts: 151
Likes: 0
From: albany, new york
Originally Posted by Nick Agostino
Sorry, I meant an all bore LS1 compared to a stroked stock bore LS1 running in the 9's
Maybe someone should try a 3.875 stroke with a 4.060 bore, there are a few LT1's running strong with this combo.
On another note look at 500 inch pro stock engines, BIG bore/ short stroke and always complaining they can't get enough cylinderhead!! have you guys seen a 600+ cfm pro stock head
Maybe someone should try a 3.875 stroke with a 4.060 bore, there are a few LT1's running strong with this combo.
On another note look at 500 inch pro stock engines, BIG bore/ short stroke and always complaining they can't get enough cylinderhead!! have you guys seen a 600+ cfm pro stock head
a little closer. I said I will be spraying also, I never said 9's N/A. 
Staging Lane
Joined: Jan 2004
Posts: 74
Likes: 0
I think i like the idea of giving up a few more HP and get back more torque that comes in at a lower rpm. It's torque that burns down the 1/4 mile not HP. Unless it's a light car, which ours aren't. I'll take the extra 20 ft/lbs over the 15 to 17 HP for the street or the strip anyday. I might go thru the traps 1 mph slower but my ET will be lower. Jump over to MTI's site, they show you a dyno sheet of both motors. They are very close in power, but the stroker makes its power 400 rpm sooner and only gives up about 17rwhp over the Big Bore. And the Bore motor has a little more cubes too. But i do wish someone would make something like a 3.75" crank to drop into a All Bore motor with a 4.125" bore. Now we would be getting the best of both worlds This way it's Bored & Stroked. Or maybe a 3.622" crank could be cut down to make something in the 3.75" to 3.8" crank.....hmmmm.
This way it's Bored & Stroked. Or maybe a 3.622" crank could be cut down to make something in the 3.75" to 3.8" crank.....hmmmm. Launching!
Joined: Jan 2002
Posts: 252
Likes: 0
From: ONTARIO/CANADA
Originally Posted by ITSovr4U
If we got on the topic of 9's because of me, Nick you need to read what I wrote a little closer. I said I will be spraying also, I never said 9's N/A.
a little closer. I said I will be spraying also, I never said 9's N/A.I actually wasn't referring to you running the 9's at all, just stating a fact that an all bore NA LS1 ran in the 9's and a stroke stock bore NA LS1 has not (as far as I Know). I was just trying to give a comparison from a big bore to stroke engine in drag perfofmance and ment nothing else by it
Those guys do great work and I know your combo will run in the 9's
I think Nick is right. Back when George C. ran his 9 sec pass many were still playing with the 346ci or the major tuners were playing with a streetable 400ci plus motor. I live in Florida so I have seen George C.'s car ride out many times.
Jack, you will hit 9's w/ spray, I'm pretty sure of that....your carrier may take 10 or 11 seconds as it tumbles down the track behind you though 
I say this as I sit with stock 10 bolt still resting comfortably in my tank.
It should be 2-3 weeks, not 3-4.
TECH Regular
Joined: Dec 2003
Posts: 486
Likes: 0
From: Cherry Hill, New Jersey State
Originally Posted by Mike K.
basically with an all bore your peak power will be higher than and equivalent stroker but the stroker will have higher torque. The all bore will also be able to rev higher.
Advantages all bore.
higher reving
more hp
Disadvantages
possibility of a dropped sleeve on a aluminum block
if you get an iron block the cost of the iron block
Need to have heads re-worked to work with bigger bore size
Stroker
Advantages
More tq than an all bore of equivalent size.
strength of forged crank
can use current ported heads if you already have them.
Disadvantages
cost of crank
lower reving
lower hp than equivalent bore.
Advantages all bore.
higher reving
more hp
Disadvantages
possibility of a dropped sleeve on a aluminum block
if you get an iron block the cost of the iron block
Need to have heads re-worked to work with bigger bore size
Stroker
Advantages
More tq than an all bore of equivalent size.
strength of forged crank
can use current ported heads if you already have them.
Disadvantages
cost of crank
lower reving
lower hp than equivalent bore.
I have a small question, I know it is weard, but I'm new here, and to seek knowlage...
What does it mean by all bore, does it mean the size of the bore is > the stoke, or does it mean the Bore size is < Stroke...
Thanks...
TECH Junkie
Joined: Dec 2001
Posts: 3,242
Likes: 0
From: Lakeland, FL
bore is when a cylinder is honed out or opened up to increase the cubic inches. Usually when somebody says all bore that means that they are using a stock stroke crankshaft and that they have honed out or bored the cylinder walls to acheive a greater displacement.
stroke is the opposite. A stroker is when somebody uses a crankshaft that moves the rod and piston further so that you get more cubic inches. When somebody does this you basically keep the stock bore and only change the crankshaft.
Then there is a superstroker that is when you combine both bore and stroke and you start getting some of the really large cubic inch vehicles.
stroke is the opposite. A stroker is when somebody uses a crankshaft that moves the rod and piston further so that you get more cubic inches. When somebody does this you basically keep the stock bore and only change the crankshaft.
Then there is a superstroker that is when you combine both bore and stroke and you start getting some of the really large cubic inch vehicles.
TECH Regular
Joined: Dec 2003
Posts: 486
Likes: 0
From: Cherry Hill, New Jersey State
Originally Posted by Mike K.
bore is when a cylinder is honed out or opened up to increase the cubic inches. Usually when somebody says all bore that means that they are using a stock stroke crankshaft and that they have honed out or bored the cylinder walls to acheive a greater displacement.
stroke is the opposite. A stroker is when somebody uses a crankshaft that moves the rod and piston further so that you get more cubic inches. When somebody does this you basically keep the stock bore and only change the crankshaft.
Then there is a superstroker that is when you combine both bore and stroke and you start getting some of the really large cubic inch vehicles.
stroke is the opposite. A stroker is when somebody uses a crankshaft that moves the rod and piston further so that you get more cubic inches. When somebody does this you basically keep the stock bore and only change the crankshaft.
Then there is a superstroker that is when you combine both bore and stroke and you start getting some of the really large cubic inch vehicles.
