best mileage cam? - Team Camaro Tech
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post #1 of 15 (permalink) Old Jul 14th, 00, 10:35 AM Thread Starter
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From the research that I have done it sounds like the best mileage cam is around a 212 duration@.050.

Does this sound about right?

Those of you with that range of cam like 210-215 @.050 - what kind of mileage do you get?

I am thinking of putting this in my daily driver. Comp cams 260H or XE256 But I am not sure what will get the best mileage.

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69 Camaro 1977 350
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post #2 of 15 (permalink) Old Jul 14th, 00, 07:05 PM
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I had the Comp Cams 260H in my 327 in the past.I was getting about 13 MPG with 3.42's,TH350,Edelbrock 1406 carb(jetted for power),Driving like I stole it.If this helps.

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post #3 of 15 (permalink) Old Jul 15th, 00, 05:04 PM
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Eric...I have a 268H in my 355 and am getting around 13-15mpg with 3.31's if that helps any....
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post #4 of 15 (permalink) Old Jul 15th, 00, 05:26 PM
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Running an Edelbrock Performer in my 70. 355, 9.7;1 comp, 1.6 full rollers, five speed, 2;73 rear. Can get 24 mpg mostly highway driving. Good power up to 5000 rpm, not much above that. Hard to beat for my setup.
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post #5 of 15 (permalink) Old Jul 17th, 00, 04:03 AM
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My 67 has a 355 with edelbrock air gap intake, AFR 190 heads, 9.5:1 compression, Holley 650 carb, afterburner headers, 2 1/2" exhaust, 3.73 gear, 700R4, and 2500 rpm stall with lock-up. I have a comp XE270HR hyd roller cam (218@.050) with 1.6 roller tip rockers. I get 17-18 mpg and 13.08 at 108 mph in the quarter. I would use the split pattern XE cam over the single pattern cam for a street car. A friend of mine has the XE 262 cam in his 355 and he loves it.
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post #6 of 15 (permalink) Old Jul 18th, 00, 08:05 AM
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My combo is very similar to Squarles' except I have a 3.08 rear and Performer RPM heads. I get 18-20 MPG. The car ran stronger when I had 3.73s but I drive 100 miles R/T to work.
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post #7 of 15 (permalink) Old Jul 18th, 00, 05:20 PM
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I dont see how you are getting such good gas milage. I have a holly 650 double pumper, mild cam, 3.35 gears, and stock GM heads and I get less then 10 miles to the gallon. What is the secreat to better gas milage?
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post #8 of 15 (permalink) Old Jul 18th, 00, 07:16 PM
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Lots of little things add up to make for good gas mileage. The only secret I know of is to put an oxygen sensor with a readout meter on the car. I got the Edelbrock outfit for mine. Spend about 6 months, took the carb apart maybe 10 times before I got it really dialed in. Better mileage and more power too.
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post #9 of 15 (permalink) Old Jul 19th, 00, 06:01 AM
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The secret is overdrive. All other things contribute but the biggest reason is overdrive.
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post #10 of 15 (permalink) Old Jul 19th, 00, 06:21 AM
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Overdrive is definatly the way to go. Proper fuel mixture and a good ignition system is important also. I did not list it above but I have a MSD 6AL and a stock point type distributor with a unilite conversion kit on my car also.
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post #11 of 15 (permalink) Old Jul 25th, 00, 08:53 AM
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I have always found that gas mileage and Holley are not always the best match. Adding a double pumper to the mix really hurts. Don't get me wrong about Holley, I love them for power, but I don't expect much else from them.
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post #12 of 15 (permalink) Old Jul 26th, 00, 03:39 AM
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Hey I have a 396 bored 30. I am running a 9.6 compression ratio, stock sized valves,stock exhaust manifolds with 2 & 1/2 pipes with flat turbo mufflers, cast iron holley intake, a 600 cfm elderbrock carb, a 268 XE comp. cam, a m-20 4speed & 3:08 gears. I got 17.5 mpg on the last tank of gas on this combo, & have power from idle to 6000 rpms. I love the way this cam sounds & runs

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post #13 of 15 (permalink) Old Jul 26th, 00, 01:42 PM
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I am still learning about the small block engin. I am just amased at the gas milage you are getting. If I were to put a Ox sensor in my system, what would I look for. Does the fuel miture get leaner as the engin excellerates? I have no clue where to start.
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post #14 of 15 (permalink) Old Jul 27th, 00, 01:30 PM
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A very good cam for mileage and torque is chevy's old -929 hydraulic out of a 195hp 283, 250/300hp 327, 295hp 350 and I think the 265hp 400. It's got .390"/.410" lift and 195/202 duration (or there abouts)at .050".

My stock 67ss camaro's L48- 295hp 350 with an M-20 four speed and posi 3.31 gears used to get 16 to 17 mpg if I didn't drive he-- out of it. pdq67
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post #15 of 15 (permalink) Old Jul 27th, 00, 01:35 PM
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Thanks to David Pozzi, here's a site that will show you how to make your own $30 O2 sensor. It works. I finished mine last week and will be doing more tuning after the new cam is in.
http://www.bob2000.com/carb.htm

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