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How to get an LS3 to 13:1 compression cheaply

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Old 12-24-2016, 01:22 PM
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Really depends on the convertor manufacturer. In my last car with 5200 convertor i estimated about 9% slip
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Old 12-24-2016, 09:51 PM
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Is that a 'roo catcher up front?
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Old 12-26-2016, 10:53 AM
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Originally Posted by S10xGN
Is that a 'roo catcher up front?
And a 'roo carrier on the roof!

Andrew
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Old 12-26-2016, 10:55 PM
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Originally Posted by dogsballs
Really depends on the convertor manufacturer. In my last car with 5200 convertor i estimated about 9% slip
I'm thinking down under terms may be different it probably describes what we know as flash I had a 3700 that flashed to 5400 on the hit running down the road (I could be wrong) I got to say I miss it and may go back to it.
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Old 12-27-2016, 04:48 AM
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Can't speak for Dogsballs, but I only every refer to flash point of a converter.

My previous AllFast 15-090 converter flashed to 5,000+rpm.
Current AllFast 25-090 converter flashes to 4,200rpm.
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Old 02-04-2021, 07:39 PM
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Originally Posted by dogsballs
Go as high as you can. This is my 15.0:1 alloy 6.0 with ls3 heads we dynoed the other day. 721hp @8000rpm, shoukd be more but vac pump wasnt working

https://m.facebook.com/story.php?sto...6&id=664069125
what was the stroke and bore of this engine? Those are some impressive #
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Old 02-04-2021, 09:34 PM
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Originally Posted by Taylorboi803
what was the stroke and bore of this engine? Those are some impressive #
Dogsballs hasn't been here in 4 years. Check post dates....
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Old 02-04-2021, 10:07 PM
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Originally Posted by Taylorboi803
what was the stroke and bore of this engine? Those are some impressive #
You consider looking up his Name and threads Started?
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Old 02-04-2021, 10:09 PM
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😩

https://ls1tech.com/forums/dynamomet...-8000-e85.html
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Old 02-14-2021, 02:12 PM
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Originally Posted by Taylorboi803
what was the stroke and bore of this engine? Those are some impressive #
If he says “6.0”, I can only assume it is 4.000x3.622.
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Old 02-18-2021, 04:26 PM
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Originally Posted by etekberg
I've got an L92 to LS3 conversion I'm doing. It will be an E85 street car going in a C5. Thinking I'd want 13:1 to 13.5:1 compression. This will be my first LS build, so no experience; meaning don't assume I know my as* from a hole in the wall. Mainly doing it as just a fun project.

Is there an inexpensive way to get there? Custom pistons my only option?

I'm interested in cheap, because if it gets too expensive, I figure I'll just bite the bullet and go with an ERL dry sleeve 440ci.
I know that the original post is old. But I just thought I would post this for reference in case someone wants to do something similar. Anyway, I was looking for pistons for an LS build, and came across these pistons. These are just off the shelf PowerPak pistons from Mahle, and will be FAR cheaper than custom pistons. If you are okay with 2618 pistons, the pistons alone will get you into the mid 12’s. Throw in a thinner head gasket, and you are EASILY at 13:1.
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Old 02-19-2021, 11:47 AM
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Also just throwing it out there, GPI now has a rod/piston combo to net up to 13.5:1CR for LS3 guys.
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Old 02-27-2021, 08:58 PM
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4.03
3.622
LS3/L92's milled to 66cc
12cc domes
6.125 rods
0 deck
.040 compressed thickness
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LS370 with 13:1
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