Identifying Pistons
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Pro
Joined: Jun 2002
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From: La Jolla California
Identifying Pistons
I'm trying to identify which brand pistons I have and what sorta specs they have. I think they might be TRWs but don't know for sure. The only marking I can see on the top of the pistons are the numbers L2491. There are also some smaller numbers on them but they are different on every piston. The pistons are flat top with 2 valve reliefs. Any help would be appreciated.
Thanks
Thanks
Pro
Joined: Aug 2002
Posts: 702
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From: the corner of walk and dont walk
Re: Identifying Pistons (Langadorf)
I'm trying to identify which brand pistons I have and what sorta specs they have. I think they might be TRWs but don't know for sure. The only marking I can see on the top of the pistons are the numbers L2491. There are also some smaller numbers on them but they are different on every piston. The pistons are flat top with 2 valve reliefs. Any help would be appreciated.
Thanks
Thanks
383 - 4.030"bore X 3.750" stroke
388 - 4.060"bore X 3.750" stroke
1.430 compression distance
piston weight = std bore - 482+or- 4 grams
.030 bore - 497 +or- 4 grams
.060 bore - 512 +or- 4 grams
use with 5.7" rod, .020 deck clearance, .039 compressed head gasket thickness, compression ratio is as follows: 57cc combustion chamber=11.5
64cc chamber = 10.6
68cc chamber = 10.2
76cc chamber = 9.4
NOTES: A lightweight forged flat top/2 valve reliefs for 3 3/4" stroker using 400 crank. 2 valve reliefs = 3.4cc dish, wrist pins weigh 143 +or- 2 grams, either press fit or floaters.
You've got a very good, strong set of pistons, enjoy! :cheers:
