350 roller/vortec heads/xr270 mpg
05-07-2013, 02:38 PM
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350 roller/vortec heads/xr270 mpg
Hey guys im about to start a new project. This will be for a daily driver. A 1996 roller block 350, carb 600 cfm,with vortec heads modified for higher lift,electric water pump, shorty headers for clearance, with a xr270 cam. Compression is 9:6:1. I want to run 87 octane without any problems. Im still debating in using a th350 or 700r4 This will be going into 86 camaro with 3:42 gears. Are any of you guys running this combo? I want to know what your mpg, driveability, power, likes and dislikes.
Last edited by 86iroc504; 05-07-2013 at 02:51 PM.
05-07-2013, 02:45 PM
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Re: 350 roller/vortec heads/xr270 mpg
Not that combo exactly however my Vortec headed 350 with an XR276HR cam, 670 vac sec Holley,a 700R4 and 3.70 gears netted 22+ mpg on the hiway.
Tuning was done via a wide band O2 sensor with hi-way AFRs in 15-16:1 range.
10:1 static compression ratio with the short cam required premium fuel.
Tuning was done via a wide band O2 sensor with hi-way AFRs in 15-16:1 range.
10:1 static compression ratio with the short cam required premium fuel.
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