Pick me a Cam for my stock 350 for good gas mileage daily driver - Chevelle Tech
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post #1 of 35 (permalink) Old Oct 27th, 09, 1:16 PM Thread Starter
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Pick me a Cam for my stock 350 for good gas mileage daily driver

Hello all.

I've got a stock 350 short block with the 305 #416 58cc heads. I'm not looking for performance. I want this motor to get good gas mileage.

I currently have a Comp Cams 12-234-2 Xtreme 4x4 cam that I can use:
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,000-5,200
Intake Duration at 050 inch Lift 212
Exhaust Duration at 050 inch Lift 218
Duration at 050 inch Lift 212 int./218 exh.
Advertised Intake Duration 256
Advertised Exhaust Duration 268
Advertised Duration 256 int./268 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.447 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.454 in.
Valve Lift with Factory Rocker Arm Ratio 0.447 int./0.454 exh. lift
Lobe Separation (degrees) 110
Intake Valve Lash 0.000 in.
Exhaust Valve Lash 0.000 in.
Computer-Controlled Compatible No
Grind Number CS XE256H-10

or should I go with a smaller cam for better gas mileage like the Summit cam:
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,500-4,000
Intake Duration at 050 inch Lift 204
Exhaust Duration at 050 inch Lift 214
Duration at 050 inch Lift 204 int./214 exh.
Advertised Intake Duration 262
Advertised Exhaust Duration 272
Advertised Duration 262 int./272 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.420 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.442 in.
Valve Lift with Factory Rocker Arm Ratio 0.420 int./0.442 exh. lift
Lobe Separation (degrees) 112
Intake Valve Lash 0.000 in.
Exhaust Valve Lash 0.000


I know the 305 #416 heads might be give too much compression with the 58cc chambers so I want to make sure a small cam will bleed off enough cylinder pressure to prevent pinging or detonation.

Any help on a good gas mileage cam for a daily driver would be appreciated!
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post #2 of 35 (permalink) Old Oct 27th, 09, 1:20 PM
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Dave 383 now
 
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

Flat top piston or dished?

Dave
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post #3 of 35 (permalink) Old Oct 27th, 09, 1:26 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

Quote:
Originally Posted by Ratbones2002 View Post
Hello all.

I've got a stock 350 short block with the 305 #461 58cc heads. I'm not looking for performance. I want this motor to get good gas mileage.

I currently have a Comp Cams 12-234-2 Xtreme 4x4 cam that I can use:
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,000-5,200
Intake Duration at 050 inch Lift 212
Exhaust Duration at 050 inch Lift 218
Duration at 050 inch Lift 212 int./218 exh.
Advertised Intake Duration 256
Advertised Exhaust Duration 268
Advertised Duration 256 int./268 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.447 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.454 in.
Valve Lift with Factory Rocker Arm Ratio 0.447 int./0.454 exh. lift
Lobe Separation (degrees) 110
Intake Valve Lash 0.000 in.
Exhaust Valve Lash 0.000 in.
Computer-Controlled Compatible No
Grind Number CS XE256H-10

or should I go with a smaller cam for better gas mileage like the Summit cam:
Cam Style Hydraulic flat tappet
Basic Operating RPM Range 1,500-4,000
Intake Duration at 050 inch Lift 204
Exhaust Duration at 050 inch Lift 214
Duration at 050 inch Lift 204 int./214 exh.
Advertised Intake Duration 262
Advertised Exhaust Duration 272
Advertised Duration 262 int./272 exh.
Intake Valve Lift with Factory Rocker Arm Ratio 0.420 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio 0.442 in.
Valve Lift with Factory Rocker Arm Ratio 0.420 int./0.442 exh. lift
Lobe Separation (degrees) 112
Intake Valve Lash 0.000 in.
Exhaust Valve Lash 0.000


I know the 305 #461 heads might be give too much compression with the 58cc chambers so I want to make sure a small cam will bleed off enough cylinder pressure to prevent pinging or detonation.

Any help on a good gas mileage cam for a daily driver would be appreciated!

#461 heads are camel hump heads. There are 305 heads cast as number 416. Are those the heads you have?

And as asked above...what pistons?

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
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post #4 of 35 (permalink) Old Oct 27th, 09, 1:33 PM Thread Starter
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

See correction above. Heads are 416's
I'm not sure if I have flat top or domes? It's a stock 350 from an 85 Chevy Truck.
block # 3970010
heads# 14014416
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post #5 of 35 (permalink) Old Oct 27th, 09, 1:44 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

Those pistons are probably flat tops with brows or notches. With chambers at 58cc, and a stock repl. head gasket, you will be right around 10:1 compression. The summit cam would be better, and with those heads in as-cast form on a 350, they may not want to rev much over 4,000 rpm anyways.

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
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post #6 of 35 (permalink) Old Oct 27th, 09, 3:34 PM Thread Starter
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

Quote:
Originally Posted by Highway Star View Post
Those pistons are probably flat tops with brows or notches. With chambers at 58cc, and a stock repl. head gasket, you will be right around 10:1 compression. The summit cam would be better, and with those heads in as-cast form on a 350, they may not want to rev much over 4,000 rpm anyways.
I also have a set of 333882's. I'm now wondering which heads would be better. the 882's or the 416's
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post #7 of 35 (permalink) Old Oct 27th, 09, 4:10 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

Those are 76cc chamber heads. They will leave you a little over 8:1 compression. You could run on 87 octane with them for sure. If economy is what you are after, I say to use them. You just might get away with using that other cam, too.

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
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post #8 of 35 (permalink) Old Oct 27th, 09, 4:13 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

What is all this going into? Trans, Gearing, the complete vehicle rundown also.

You can;t pick a cam to get good mileage if you don't know all that.

If you have a fairly light vehicle I would not even rule out a smaller motor. Especially since your not looking to go fast.

-Bobby-
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post #9 of 35 (permalink) Old Oct 27th, 09, 4:15 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

He is trying to use parts that are on hand. 350 block with flat-tops, and either 416 or 882 heads, and the two cams he listed, either the little summit cam, or the little comp cam.

1972 Malibu Sport Coupe - Victory Red on Black - 350/TH350

I do all my own stunts.
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post #10 of 35 (permalink) Old Oct 27th, 09, 4:21 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

I think you'd get better results from the 416s and the Comp cam. Should be a good-running very mild street combo, with the mileage you're looking for.
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post #11 of 35 (permalink) Old Oct 27th, 09, 4:28 PM
von
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

IMO if it's gas mileage you want, go with the Summit cam and 882 heads. Better chance of running 87 octane too.

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post #12 of 35 (permalink) Old Oct 27th, 09, 6:26 PM Thread Starter
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

Quote:
Originally Posted by Lilracr View Post
What is all this going into? Trans, Gearing, the complete vehicle rundown also.

You can;t pick a cam to get good mileage if you don't know all that.

If you have a fairly light vehicle I would not even rule out a smaller motor. Especially since your not looking to go fast.

-Bobby-
I just pulled the heads on the 350. They are flat top pistons.

Heres my info:
72 El camino
700r4 tranny
gears prob 3.08's?
Electric fans
all external engine components from an 89 camaro. (serpentine belt)
reverse water pump (need to drill head to accomodate)

I want to run 87 octane for gas for mileage. I don't want to be running 91 octane!
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post #13 of 35 (permalink) Old Oct 27th, 09, 6:32 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

My ex had a 76 vette. It had a cracked 882 head. I took them off, put some 487 heads from a 400 sb and it ran so much better. 18 mpg, 100 mph quarter mile.
found a replacement head 882 and it went back to 14 mpg and 85 mph quarters.

Sell those heads to numbers correct vette guy!!!!
both heads were 76 cc.
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post #14 of 35 (permalink) Old Oct 27th, 09, 6:33 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

Check those -882 for cracks before install...they are prone to do so.

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post #15 of 35 (permalink) Old Oct 27th, 09, 10:35 PM
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Re: Pick me a Cam for my stock 350 for good gas mileage daily driver

if fuel mileage is your ultimate goal, then get the Speed Pro cam that has .390 intake and .410 exhaust lift and run the 416 heads for a little extra compression compared to the 882's.
the cam itself will run you a whopping $50 or so from www.northernautoparts.com, or you could just get one of their 350 rebuild kits that are about $180 and come with everything you will need to rebuild your engine. that cam is the base cam that comes with the kit..
it will have about 22" of vacuum at a 500 rpm idle in gear and should get gas mileage in the mid 20's or so, depending on the car and gearing and what not.

the first motor i ever "built" was the stock 350 with 882 heads in a 76 Monte Carlo i had back in '93. the car had a TH350 and 2.56 gears.
i ordered the Northern kit for $159 and threw it together on the greasy floor of my garage. that thing did some nasty burnouts and would get an honest 30mpg from time to time. it was the strangest thing to have a 76 Monte that could go 300 miles on 10 gallons of gas, but it did it. it always fired right up in the coldest MN mornings and would idle silky smooth at 500rpm in gear with instant throttle response.

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