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Thread: Carb swap compression ratio?
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06-21-2015, 05:18 PM #1
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Carb swap compression ratio?
I'm helping a friend build a 355 LT1 to swap into his 89 SWB 2wd C1500. We're going to convert to carburetion and plan to run LE1 heads. What would a good CR target be considering it will be carbureted? Planning on running 93 octane. Thanks in advance.
96 Trans Am WS6
73 Formula 400
74 Trans Am
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06-21-2015, 05:29 PM #2
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Since you're going with Le heads I would talk with Lloyd about that as well as a cam. Depending on what is goals and usage are I'm guessing he will suggest somewhere between 11.5 and 12.0
Chris
1985 Monte Carlo SS
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06-21-2015, 05:42 PM #3
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06-21-2015, 05:51 PM #4
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if its an auto with no stall and going to be used as a "truck" (towing, etc) just a stock compression 10.5 to 1 comp. ratio and very mild cam (215 or less @ .050) can be used.
If its gonna be used as a "heavy Camaro" and no towing, just streety rod and some track use a larger cam and more compression can be used depending on what gear, rear tire ht and stall is used.
Lloyd
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06-21-2015, 07:22 PM #5
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Thanks Lloyd. This truck is his secondary vehicle so he's looking for a street/occasional strip setup. Pretty sure he's planning on a 27" tire, 4.11 gears, and a pretty loose converter. I showed him your heads/cam package and he's very interested. We'll be giving you a call soon!
Originally Posted by NightTrain66
96 Trans Am WS6
73 Formula 400
74 Trans Am
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06-22-2015, 08:46 AM #6
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A flat top piston with eye brows (NOT a dish or dome) will be fine.
Exact piston (-4, -5, -8cc, etc) used, deck ht and head gasket thickness will control the exact compression but anywhere in the 11.3-11.8 range will be fine.
4L60 trans with 3200-3600 stall I would do a 227/235 .565/.579 108 LSA up to a 231/239 .571/.587 108 LSA cam with the carb..
If its a TH 350 trans and/or less stall I would do a 223/231 .557/.571 110 LSA cam.
Lloyd
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