help on max stroke of ls1 block
help on max stroke of ls1 block i need help on a couple of things i just recently blew my ls1 engine in a 98 tans am i would like to know what the max stroke a ls1 can handle (not a 408 block )
or to make matters a little bit more easer if there is someone out there with hella knowledge bout ls1 engines basically can i buy the 383 kit below and put it in the stock block i have im asking this cause the stroke on my block is 3.622 and im wondering if there is enough clearence and also could i have my block bored out to the 3.905 from 3.898 ?
Chevy LS-1 383ci Balanced Competition Assembly,
Bore Dia.: 3.905''
Stroke: 4.000''
Rod Length: 6.200''
Piston Type: Flat Top @ -2cc
Comp Ratio: 11.3:1 w/64cc Head, 11.0:1 w/66cc Head, 10.4:1 w/72cc head
or to make matters a little bit more easer if there is someone out there with hella knowledge bout ls1 engines basically can i buy the 383 kit below and put it in the stock block i have im asking this cause the stroke on my block is 3.622 and im wondering if there is enough clearence and also could i have my block bored out to the 3.905 from 3.898 ?
Chevy LS-1 383ci Balanced Competition Assembly,
Bore Dia.: 3.905''
Stroke: 4.000''
Rod Length: 6.200''
Piston Type: Flat Top @ -2cc
Comp Ratio: 11.3:1 w/64cc Head, 11.0:1 w/66cc Head, 10.4:1 w/72cc head
First off, you are not going to be able to bore the block in your 98. The sleeves are only able to handle a *slight* hone job before they become too thin. The 99+ motors got an updated design that can handle a bit of a bore job.
A 408 is a 4.000" stroke and 4.030 bore. 402 is a 4"x4" setup. You do not need a special block for this application, although most use either the LS2 (need a few mods to make work in an LS1 car) or the 6.0L iron block.
The biggest stroke I've ever seen in an LSx motor is 4.500", which is going in SAM's 500" LSx.
My advice is check out some of our sponsers assembled shortblocks. Even if you do find a better deal on maching and labor by a local shop, they will most likely not have the experience with working on LSx's as say TSP, Thunder, Futral, HPE would.
BTW - I'm moving this to the internal section, alot of knowledgeable guys in there.
A 408 is a 4.000" stroke and 4.030 bore. 402 is a 4"x4" setup. You do not need a special block for this application, although most use either the LS2 (need a few mods to make work in an LS1 car) or the 6.0L iron block.
The biggest stroke I've ever seen in an LSx motor is 4.500", which is going in SAM's 500" LSx.
My advice is check out some of our sponsers assembled shortblocks. Even if you do find a better deal on maching and labor by a local shop, they will most likely not have the experience with working on LSx's as say TSP, Thunder, Futral, HPE would.
BTW - I'm moving this to the internal section, alot of knowledgeable guys in there.
Max stroke on a STOCK LS1 block is going to be about 4.125". With a stock/slightly honed bore, this will give you 395 cubes. The only trouble with adding this much stroke is moving the ringlands to were they won't come out of the bottom of the bore. This in turn gives you a cramped ring pack, which is ok for N/A performance, but won't be so great if you decide to go power adder. I have a 4.185" stroke crank, but I also have longer, custom sleeves.
