Stroker options
TECH Fanatic
Joined: Aug 2004
Posts: 1,373
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From: Auckland, Nth Is, New Zealand.
Last edited by ls1 1990 VN; Nov 1, 2013 at 09:09 PM.
Launching!
Joined: May 2011
Posts: 215
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From: Honey Brook, Pa.
If you want to use a 4.8 then find that article that Hot Rod(I think) did on twin turbos on a 4.8. They thought they had a 5.3 but ended up being a 4.8, put out 1200hp on an engine dyno and that was with a stock bottom end out of a junk yard. Just food for thought!!
The easiest destroking combo is the 4.8 crank AND rods with LS1/LS6 pistons....all factory parts or off shelf replacement aftermarket parts. So the 4.8 or 5.3 is bored to the 3.905" size (max bore) or if you are starting with a LS1, it will also be bored to 3.905" (max bore). The reason for the max bore is not only getting some cubic inches but to unshroud the valve as much as this combination allows for maximum flow. This combo is possible because the 4.8 piston shares the same compression height as an LS1...or even a 5.3, for that matter. This motor will be about 314 cubic inches. I bet it would make a hell of a boosted motor because long rod/short stroke combinations usually respond well to boost and are very durable.
TECH Fanatic
Joined: Aug 2004
Posts: 1,373
Likes: 4
From: Auckland, Nth Is, New Zealand.
The easiest destroking combo is the 4.8 crank AND rods with LS1/LS6 pistons....all factory parts or off shelf replacement aftermarket parts. So the 4.8 or 5.3 is bored to the 3.905" size (max bore) or if you are starting with a LS1, it will also be bored to 3.905" (max bore). The reason for the max bore is not only getting some cubic inches but to unshroud the valve as much as this combination allows for maximum flow. This combo is possible because the 4.8 piston shares the same compression height as an LS1...or even a 5.3, for that matter. This motor will be about 314 cubic inches. I bet it would make a hell of a boosted motor because long rod/short stroke combinations usually respond well to boost and are very durable.
LS1 LS2 LS6 3.908 Mahle Pistons
Bore:3.908
Stroke: 3.622
Rod Length: 6.098
Dome Volume: -4
Pin Diameter .945
Compression Height: 1.340
Click here to check inventory on Piston Kit LS1340908F04
Bore:3.908
Stroke: 3.622
Rod Length: 6.125
Dome Volume: -4
Pin Diameter .927
Compression Height: 1.314
Click here to check inventory on Piston Kit LS1314908F04
Bore:3.908
Stroke: 3.622
Rod Length: 6.125
Dome Volume: -9
Pin Diameter .927
Compression Height: 1.314
Click here to check inventory on Piston Kit LS1314908I09
Bore:3.908
Stroke: 3.622
Rod Length: 6.125
Dome Volume: -16
Pin Diameter .927
Compression Height: 1.314
Click here to check inventory on Piston Kit LS1314908I16
Bore:3.908
Stroke: 4.000
Rod Length: 6.125
Dome Volume: -6
Pin Diameter .927
Compression Height: 1.105R
Click here to check inventory on Piston Kit LS1105908I06
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 56
Likes: 0
The easiest destroking combo is the 4.8 crank AND rods with LS1/LS6 pistons....all factory parts or off shelf replacement aftermarket parts. So the 4.8 or 5.3 is bored to the 3.905" size (max bore) or if you are starting with a LS1, it will also be bored to 3.905" (max bore). The reason for the max bore is not only getting some cubic inches but to unshroud the valve as much as this combination allows for maximum flow. This combo is possible because the 4.8 piston shares the same compression height as an LS1...or even a 5.3, for that matter. This motor will be about 314 cubic inches. I bet it would make a hell of a boosted motor because long rod/short stroke combinations usually respond well to boost and are very durable.
That's exactly what I wanted to hear
I'll keep you posted as to how everything goes
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 56
Likes: 0
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Launching!
Joined: Mar 2013
Posts: 266
Likes: 0
From: Richmond, VA
I think I get what he wants to do and thats fine and all. He wants to go out and beat some mustangs with similar displacement and shoot down their argument of "Your engine is bigger"? I can see how that could be somewhat satisfying. But I think once he beats a couple of them he's gonna wish he spent the same money for a bigger build to beat all/most the mustangs he runs into.
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 56
Likes: 0
I think I get what he wants to do and thats fine and all. He wants to go out and beat some mustangs with similar displacement and shoot down their argument of "Your engine is bigger"? I can see how that could be somewhat satisfying. But I think once he beats a couple of them he's gonna wish he spent the same money for a bigger build to beat all/most the mustangs he runs into.
However I have never ruled out forced induction
Just not something I'm gonna do on a yard motor
I'm gonna find a short block and go from there
And I also wanna see if its possible to de stroke a newer technology small block and build something similar to the 302 Chevy from
Back in the day
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Joined: Jun 2011
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From: Katy, TX
Thread Starter
Staging Lane
Joined: Oct 2013
Posts: 56
Likes: 0
283 and 307 have the same bore 3.875
My bad
I apologize I've been in the Jap/Euro world for a few years and haven't thought of doing a v-8
But after finding out what It would take to make decent power out of a Bimmer I was like screw this I'm building a Trans Am
305-327- and 350 have the same bore
I totally spaced 327 having a 4" bore
But also I remember seeing something once a guy had I believe it was a 335 stroker of some sort in an Iroc I believe made from a 305
And I don't know what crank but I would assume the only other crank would be a 350 so how does that work
Same Bore
My bad
I apologize I've been in the Jap/Euro world for a few years and haven't thought of doing a v-8
But after finding out what It would take to make decent power out of a Bimmer I was like screw this I'm building a Trans Am
305-327- and 350 have the same bore
I totally spaced 327 having a 4" bore
But also I remember seeing something once a guy had I believe it was a 335 stroker of some sort in an Iroc I believe made from a 305
And I don't know what crank but I would assume the only other crank would be a 350 so how does that work
Same Bore
TECH Senior Member
Joined: Feb 2009
Posts: 5,445
Likes: 4
no need to spin a motor past peak hp .the ls heads flow a lot better then most old school engine heads .the ls head can make better power at a lower rpm with a smaller cam.cubes is king .a few ls1 have made 460 rwhp with stock ported heads and short block ,that is with a hd rear end. my old 509 bbc made 761 hp at 7000 rpm ,it ran fastest when shifting at 7000 rpm.
That's not true. Almost all LS1s with plastic manifolds peak in the 6300 range due to the runner design. Guess what? You go faster the higher you shift, especially if you can hold peak HP beyond 6300. Almost any cam bigger than a 224 can hold on to 6600-6700...