Can an LS1 be stroked to 377 ci?
Can an LS1 be stroked to 377 ci? The 1963 Grand Sport Corvettes (I'm building a replica) were powered by 377 ci all aluminum V8s. It would be cool since I'm using an LS1 which is all aluminum... to somehow make it 377 ci. What would the bore and stroke have to be to get 377? Would it be worth it?
It would just be soooooo cool to be able to say it's a 'modern version' of what was once used.
Experts.... what say you?
It would just be soooooo cool to be able to say it's a 'modern version' of what was once used.
Experts.... what say you?
Staging Lane
Joined: Sep 2003
Posts: 93
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Originally Posted by Mark IXZD 150
The 1963 Grand Sport Corvettes (I'm building a replica) were powered by 377 ci all aluminum V8s. It would be cool since I'm using an LS1 which is all aluminum... to somehow make it 377 ci. What would the bore and stroke have to be to get 377? Would it be worth it?
It would just be soooooo cool to be able to say it's a 'modern version' of what was once used.
Experts.... what say you?
It would just be soooooo cool to be able to say it's a 'modern version' of what was once used.
Experts.... what say you?
Are you sure they were not powered by 327s? I'm not a expert on old Corvettes by any means, but I'm pretty sure the first SB over 327 ci came out in the 1967 SS 350 Camaro.
If you want an aluminum 327, all you would need is the block from an SSR, they are powered by an alloy 5.3.
After years of research on these cars I have no doubts. They were definately 377 ci. Other engine sizes came and went during their careers but the most popular configuration was the 377 with the four Weber carbs.
Mark, do you plan to only run a production aluminum block?
Let's see, a 3.905 bore x 4.000 stroke is a 382ci, so you would need more stroke. I know where there is a custom small stroke crank for sale, email me, I am not sure on size might be a 3.77 or so. Stock is 3.62 FYI.
EDIT: BradWS6 used to have a 370 or 372 ci motor. It was a 3.900 bore x 3.900 stroke. I think it was a custom Scat crankshaft.
Let's see, a 3.905 bore x 4.000 stroke is a 382ci, so you would need more stroke. I know where there is a custom small stroke crank for sale, email me, I am not sure on size might be a 3.77 or so. Stock is 3.62 FYI.
EDIT: BradWS6 used to have a 370 or 372 ci motor. It was a 3.900 bore x 3.900 stroke. I think it was a custom Scat crankshaft.
Originally Posted by Pro Stock John
Mark, do you plan to only run a production aluminum block?
Let's see, a 3.905 bore x 4.000 stroke is a 382ci, so you would need more stroke. I know where there is a custom small stroke crank for sale, email me, I am not sure on size might be a 3.77 or so. Stock is 3.62 FYI.
EDIT: BradWS6 used to have a 370 or 372 ci motor. It was a 3.900 bore x 3.900 stroke. I think it was a custom Scat crankshaft.
Let's see, a 3.905 bore x 4.000 stroke is a 382ci, so you would need more stroke. I know where there is a custom small stroke crank for sale, email me, I am not sure on size might be a 3.77 or so. Stock is 3.62 FYI.
EDIT: BradWS6 used to have a 370 or 372 ci motor. It was a 3.900 bore x 3.900 stroke. I think it was a custom Scat crankshaft.
Well a 4.075 bore and a 3.62 stock stroke comes out to 377.7. I know that we could get it done with Darton sleeves in an aluminum block. Thats a pretty trick project we are local please let me know if we can help in any way.
Nate
Nate
Yeah there are 2-3 places that I would use for a project like that.
Are you wanting to get a custom crankshaft to work with a 3.905 or 3.910 bore or what else do you have in mind?
Scat can do custom crankshafts but the prices can be high, like $2800. Might want to see if anyone on here is a Scat dealer you might be able to save a bit since a sponsor might be buying at WD pricing.
That custom crank I was thinking of won't get you there with a stock bore but the crank is only $1000.
Are you wanting to get a custom crankshaft to work with a 3.905 or 3.910 bore or what else do you have in mind?
Scat can do custom crankshafts but the prices can be high, like $2800. Might want to see if anyone on here is a Scat dealer you might be able to save a bit since a sponsor might be buying at WD pricing.
That custom crank I was thinking of won't get you there with a stock bore but the crank is only $1000.
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Originally Posted by Nasty N8
Well a 4.075 bore and a 3.62 stock stroke comes out to 377.7. I know that we could get it done with Darton sleeves in an aluminum block. Thats a pretty trick project we are local please let me know if we can help in any way.
Nate
Nate
I was wondering about that. 346ci is pretty close to 377ci. So what would the benefits of an all bore engine combined with some good stage II orr III heads and an aggressive cam be? Could I get 550 hp at the flywheel?
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I talked to Eagle at SEMA and they are coming out with LS1 cranks. They will be available with strokes of 3.622", 3.90" and 4.00" and are forged 4340. They are designed to use Eagle's 6.100" rods.
If you were to use the Eagle 3.90" stroker crank in an LS1/LS6 block that would give you about 373 cubic inches which is close to what you are looking for.
Eagle said that the cranks/rods (they can supply pistons too, JE I think) should be available any time now. According to the catalog they gave the cranks list for $1095.
If you were to use the Eagle 3.90" stroker crank in an LS1/LS6 block that would give you about 373 cubic inches which is close to what you are looking for.
Eagle said that the cranks/rods (they can supply pistons too, JE I think) should be available any time now. According to the catalog they gave the cranks list for $1095.
Originally Posted by Pro Stock John
Yeah there are 2-3 places that I would use for a project like that.
Are you wanting to get a custom crankshaft to work with a 3.905 or 3.910 bore or what else do you have in mind?
Scat can do custom crankshafts but the prices can be high, like $2800. Might want to see if anyone on here is a Scat dealer you might be able to save a bit since a sponsor might be buying at WD pricing.
That custom crank I was thinking of won't get you there with a stock bore but the crank is only $1000.
Are you wanting to get a custom crankshaft to work with a 3.905 or 3.910 bore or what else do you have in mind?
Scat can do custom crankshafts but the prices can be high, like $2800. Might want to see if anyone on here is a Scat dealer you might be able to save a bit since a sponsor might be buying at WD pricing.
That custom crank I was thinking of won't get you there with a stock bore but the crank is only $1000.
My budget is pretty tight. What would you guess the total cost would be if I went with a custom crank plus all the other goodies that go with it including heads/cam...? What about the option of going all bore? Any downsides?
TECH Senior Member
Joined: Nov 2001
Posts: 11,603
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From: Chi-Town, IL
I'm sure speed inc. could take care of it, they built my 372c.i. motor, well they didn't directly, but their machine shop did......its got over 1000 miles on it and no problems with it......
I went the 6.0L iron block route though....
I went the 6.0L iron block route though....
If you did a Lunati 382ci stroker....
Rotating assembly: $3500
Heads: $2000 (not LS6 unless you got GM CNC ones)
Cam: $400
Springs: $150
Misc: $500
Labor: $1000
---------------
I came up with $7500 but that might be too little...
Rotating assembly: $3500
Heads: $2000 (not LS6 unless you got GM CNC ones)
Cam: $400
Springs: $150
Misc: $500
Labor: $1000
---------------
I came up with $7500 but that might be too little...
Originally Posted by RED01TAWS6
377 = 400 Block 350 crank right?
I think the All Bore is the only way to go if you're trying to get the same effect.
I think the All Bore is the only way to go if you're trying to get the same effect.
That may be what GM did with the old race engines. I bet they just bored a 350 to 377. I'll have to look into it.
Stopped on my way home and talked with Tom at Speed Inc. today. He thinks all bore is a great way to maximize torque and boost power at the same time while achieving the 377ci for historical value. All I need is a sleeved block and new pistons. That combined with some Patriot Stage II heads and a good cam and I'm set. 
Originally Posted by Pro Stock John
Mark a regular 350ci SBC is 4.00 bore x 3.48 stroke.
Some 377ci motors are 4.125 bore x 3.48 stroke I think. Basically a destroked 400ci SBC.
Some 377ci motors are 4.125 bore x 3.48 stroke I think. Basically a destroked 400ci SBC.
So you're saying the old 377s probably didn't start with 350s? I'm trying like hell to understand all this stuff...
What do you think about the all bore idea?
Originally Posted by Pro Stock John
Some did eventually but that article is innacurate. The big blocks didn't have the Weber carbs. They were L-88s.