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| | | | Joined: Jul 2005 Posts: 153 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2005 Posts: 153 | I put in a new gm LM1 290hp crate engine with edlebrock preformer intake and 600cfm carb that is calibrated for economy. I'm runing it through a 350 turbo tranny and a 3:08 rear. Dual exhaust with 40 series flowmasters. Its in my 61 panel daily driver. What should I expect for reasonable mpg? Right now I'm in the single digits and its costing me a fortune to run. I was hoping to get 12-13 mpg is that out of the question? Thanks
Mac | | | | | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | I would think you would get better than that, I have had many 350/auto trucks get 16 mpg regularly. Any brakes dragging? Timing? What do your plugs look like? | | | | | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | Bricks don't get good milage, especially around town. Also, you probably occasionally accellerate hard and use the extra power you have. Most people I've talked to get about 9 MPG with Burbs. I had a 1968 F250 that got that milage in town with a 360 CID engine and the same milage after I installed a 300 horse 500 footpound 460 CID engine. The most I ever got with either engine was 14 MPG. The aerodynamics of your panel should be similar. | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | I think it should get better MPG,s than that. The performer carb is a little rich out of the box. You can get a calibration kit for it & try leaner jets &/or metering rods. Check your initial timing & advance mechanisms.
How does the 290 HP. idle with an automatic? I,ve always used the 260 HP model.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Jul 2005 Posts: 153 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2005 Posts: 153 | Thanks for the input. New brakes all around (front disc conversion) so they are not dragging. Timing is on. I think its running rich but the plugs dont back that up. I purposely drove carefully after the last fill up and got 9 mpg. I am going to try and lean it out, hover edlebrock told me that this carb out of the box is fine? As for idleing with the 350 it idles great. As a side note my buddy with the same basic set up in his 63 pickup is getting 16 on the highway. | | | | | Joined: Jul 2004 Posts: 427 Shop Shark | | Shop Shark Joined: Jul 2004 Posts: 427 | throw a K&N filter on it, that will help also. Synthetic oil helps too. | | | | | Joined: Jul 2005 Posts: 153 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2005 Posts: 153 | Already runnning mobil 1 and a k&N
Any other ideas?
Mac | | | | | Joined: Apr 2006 Posts: 87 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2006 Posts: 87 | remove 2 plug leads and use your mexican overdrive lol | | | | | Joined: Mar 2004 Posts: 3,068 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 3,068 | I pulled down a consistant 16 MPG in my 350/SM465 combo with a 4 bbl Quad 64 C10. I see no reason why a 'burb shouldn't get simular mileage,
Scott | | | | | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | Edelbrock will tell you the same carb is jetted for economy or drag racing, whichever you are doing. | | |
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