Reliable Daily Driver: 4 inch stroke LS2
06-09-2019, 12:48 PM
#43
TECH Senior Member
Of course, on a 600HP engine, 2% of that is 12HP, so it does make sense. I bet you would not feel 12HP added to a 600HP engine though.
06-09-2019, 12:58 PM
#44
I'm happy.
I did have the option to use an LS3 block and build a 427 but I couldn't afford to buy a brand new block.
They are 2690 USD and the LS9 block is 2795 USD
I wonder why there is hardly and price difference when the LS9 is the far superior block.
Can you use this block for NA applications I wonder?
I did have the option to use an LS3 block and build a 427 but I couldn't afford to buy a brand new block.
They are 2690 USD and the LS9 block is 2795 USD
I wonder why there is hardly and price difference when the LS9 is the far superior block.
Can you use this block for NA applications I wonder?
06-09-2019, 01:05 PM
#45
TECH Senior Member
There is no reason you can't use an LS9 block for NA.
06-09-2019, 01:06 PM
#46
The only way to know for sure is to test back to back, but I will throw my opinion up and say the LS3 head will run way better on 4.125 bore vs even the stock 4.065. I think that's been proven at least once, I would think. At this point it's a valve shrouding issue waiting to be solved. Will the LS3 heads run better on any bore w/ a stroker crank, of course. It's a huge head, adding CID will make it work better., but still not optimize it. Besides, the topic is which will work better for $$$, crank or bore. I think the answer is hands down bore, just for the options it opens and the strength it gives the block.
I've known for a very long time big bore is better for hp. What I don't know is how well a correctly sleeved LS2 block holds up over time and daily driving. Will -25 F in winter time cause the sleeves to move and result in head gasket issues in a dry sleeved block?
06-09-2019, 01:18 PM
#48
My dart block 427 with 4.125 bore only showed 671hp575tq on engine dyno but was 543rwhp just before it smoked a bearing through a 4l80 and 12 bolt with 4.10 gears and unlocked 5000 stall.
Going back Wednesday to dyno again on same chassis dyno.
My 2 cents, those heads and a 4" stroke crank would work well together. And still keep a good daily driver tq curve.
I personally don't want a stock block with 4"stroke though so id do the 4.185 sleeved block then upgrade heads down the road.
Darth do the cam and you will be plenty happy
Going back Wednesday to dyno again on same chassis dyno.
My 2 cents, those heads and a 4" stroke crank would work well together. And still keep a good daily driver tq curve.
I personally don't want a stock block with 4"stroke though so id do the 4.185 sleeved block then upgrade heads down the road.
Darth do the cam and you will be plenty happy
06-09-2019, 01:28 PM
#49
TECH Veteran
My dart block 427 with 4.125 bore only showed 671hp575tq on engine dyno but was 543rwhp just before it smoked a bearing through a 4l80 and 12 bolt with 4.10 gears and unlocked 5000 stall.
Going back Wednesday to dyno again on same chassis dyno.
My 2 cents, those heads and a 4" stroke crank would work well together. And still keep a good daily driver tq curve.
I personally don't want a stock block with 4"stroke though so id do the 4.185 sleeved block then upgrade heads down the road.
Darth do the cam and you will be plenty happy
Going back Wednesday to dyno again on same chassis dyno.
My 2 cents, those heads and a 4" stroke crank would work well together. And still keep a good daily driver tq curve.
I personally don't want a stock block with 4"stroke though so id do the 4.185 sleeved block then upgrade heads down the road.
Darth do the cam and you will be plenty happy
06-09-2019, 02:04 PM
#51
Moderator
iTrader: (4)
Join Date: Jul 2014
Location: My own internal universe
Posts: 10,446
Received 1,837 Likes
on
1,145 Posts
Originally Posted by 99 Black Bird T/A
As OP of the thread the question is "Most reliable for daily driver: 4.125 bore Dry Sleeved LS2 or 4 inch stroke LS2?"
I've known for a very long time big bore is better for hp. What I don't know is how well a correctly sleeved LS2 block holds up over time and daily driving. Will -25 F in winter time cause the sleeves to move and result in head gasket issues in a dry sleeved block?
I've known for a very long time big bore is better for hp. What I don't know is how well a correctly sleeved LS2 block holds up over time and daily driving. Will -25 F in winter time cause the sleeves to move and result in head gasket issues in a dry sleeved block?
06-09-2019, 02:20 PM
#53
06-09-2019, 02:56 PM
#54
ModSquad
iTrader: (6)
The only way to know for sure is to test back to back, but I will throw my opinion up and say the LS3 head will run way better on 4.125 bore vs even the stock 4.065. I think that's been proven at least once, I would think. At this point it's a valve shrouding issue waiting to be solved. Will the LS3 heads run better on any bore w/ a stroker crank, of course. It's a huge head, adding CID will make it work better., but still not optimize it. Besides, the topic is which will work better for $$$, crank or bore. I think the answer is hands down bore, just for the options it opens and the strength it gives the block.
06-09-2019, 03:03 PM
#55
06-09-2019, 03:14 PM
#56
ModSquad
iTrader: (6)
06-09-2019, 03:19 PM
#57
TECH Senior Member
They replace the head locating dowels with dowels that are offset, about about half its length down, about 30 thousandths. They are installed so the chamber moves away from the intake valve that amount
06-09-2019, 03:34 PM
#58
Do you know if most engine builders do this?
06-09-2019, 03:41 PM
#59
ModSquad
iTrader: (6)
