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Old 04-30-2011, 07:17 PM
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Building a mpg sbc350

Hello all I have a 77 chevy short wide with a 350, well we all r dealing worth expensive gasoline, so I wanna build me a good runnin and good on gas 350
I have a 350 I have some vortec 1239906 heads and a quadrajet carb I wanna rebuild,
I needa some advice on what cam and lifters I wanna use.i also wanna use the edelbrok rpm performer intake I also have a 700r that's going behind this sweet motor I would like to cruise the highway at 65 at about 1800rpms or better.. Any advice is greatly appreciated

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Old 04-30-2011, 10:47 PM
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There are no 1239906 L31 heads. There are 12558062's and there are 10239906's, published chamber volume 64cc's. What I would do is to use an 22cc D-Cup piston such as a Keith Black hypereutectic KB101-030....
http://www.summitracing.com/parts/UEM-KB101-030/
That would put the static compression ratio right at 8.7:1 and would lay the groundwork for a short cam. I'd set the squish at a very tight 0.035" and operate on the worst pump gas I could buy.
I'd use this cam because it fits the bill and also because the lift will work with the stock valve springs and retainers on the L31 heads.
http://www.summitracing.com/parts/CRN-10003/
Here's the cam description: Excellent low end torque, smooth idle, daily useage, fuel economy, 1600-2200 cruise rpm, 8.0-9.5 static compression ratio (8.7 is right in the middle.)
Use a Quadrajet on a Edelbrock #7104 RPM intake and 1 5/8" long-tube headers. Right behind the collectors, craft up an "X" pipe, then go with two pipes to the rear through mufflers of your choice. Mount a 4" X 14" air cleaner. Use a 190 thermostat. Tire pressure at 40 all around. Plan your trips to get several things done on one trip. Do not exceed the speed limit. If you look down the road and see a red light, let off the gas and coast. If the driver behind you gives you ****, fire a couple of rounds across his hood.

Last edited by techinspector1; 04-30-2011 at 11:15 PM.
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Old 04-30-2011, 11:18 PM
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Forgot this flat tappet cam alert.....
http://www.crankshaftcoalition.com/w...ips_and_tricks
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Old 05-01-2011, 07:51 AM
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Sorry I forgot to put the 0 they r the 10239906. I alway have the crank roda and pistons in all stock. I thank u for all the advice.
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Old 05-01-2011, 12:48 PM
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Do u think that would be my best option as far as cam and lifters? this is my first engine build and I am so excited about it wanting it to get arond 20 mpg please any other advice is greatly needed....
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Old 05-01-2011, 12:54 PM
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Look At The Edelbrock Rpm Cam/lifter Set Theyre Pretty Good For What Your Tryna Do
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Old 05-01-2011, 12:56 PM
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P/n 350-7102 I Think Its Rpm Range Is From 1500-6500 Very Streetable
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Old 05-01-2011, 12:57 PM
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Ok will do thanks dude
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Old 05-01-2011, 01:00 PM
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:d Anytime Bro
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