truck cams

[russellsroost31]

hey guys if i put new cams in my truck will i have to run higher octane gas and how bad would it kill my mpgs

[pro-rider46]

you shouldnt need to run any different octane, and it should your mileage too much depending on what cam profile you choose. if you pick a big lopy cam that requires you to wind that motor out more i can see it changing your mileage a little because you will need to floor it everywhere to get going. i put some big comps in my car and the thing is a dog until about 3500 rpms then it comes alive. if you put a big cam in your truck then you probably should look into changing the gears so that your bottom end doesnt suck too much. but gears are also going to kill your fuel economy on the highway.

the best thing to do if you want to have a race truck is have another truck for a daily driver.

[russellsroost31]

alright thanks man
i was lookin at edelbrock PERFORMER-PLUS CAMSHAFTS just to help open her up a lil

[chucked]

It will hurt your fuel economy. But who cares your making more power. Also remember if you have an automatic transmission your going to need a higher stall converter

[chris p.]

i have a comp cam 268h in a built small block chevy turning 35 in. tires.have edelbrock performer,built quadrabog,factory corvette heads(1987),msd ignition,long tube headers with 2 chamber flowmasters and full length pipes and a muncie sm465.rears have 3:73 gears and i never had a problem but we do run 93 with an occasional splash of 89...mpg went from about 18 to 16.hope this helps

[chucked]

I'm calling a bluff 16 miles per gallon, no way

[Tommy Warren]

Originally posted by chucked
I'm calling a bluff 16 miles per gallon, no way

power to weight ratio

[chucked]

Still disagree. Know tons of people with hot rods and trucks. No one gets that kind of mpg

[trick450r]

Originally posted by chucked
Still disagree. Know tons of people with hot rods and trucks. No one gets that kind of mpg

agreed, I dont think you'd pull 16mpg average with that setup in a car, much less a truck on 35's with 3:73's...isnt an sm465 a 4-speed? if so then theirs just no way.

[russellsroost31]

im runnin 35s with 373 gettin around 12 to 14

[chris p.]

lol.realized i put the wrong ratio for the rear.my other truck used to have 3:73 but the one listed has 3:42.used to drive it back and forth to boston from connecticut.yes,it got 16 as built as it is.the sm465 is a three speed with the granny low for 1st and doing 65-70 i got that mpg.now she sits in the garage waitlig for a sunny day !!!!!!!!!!! wish i could figure out how to post a pic.lol

[chucked]

I bet its under 10 mpg

[chris p.]

ok then.my big block 70 camaro gets around 10 with a reverse manual valve body t-400 and 4:10's and a 28" tire and a 2,800 stall.if you can keep your foot out of them then the mpg is obtainable but obviously it's hard to do....and besides,with cam2 being over $10 a gallon you have to go easy.lol

[pro-rider46]

i got 25mpg in my stang being stock, and now i have comp 278 cams, 373s, lt headers, no cats, borla catback, no egr, rerouted pcv(so it doesnt dump back into the engine) sct tuner(base tune yet to be refined) and a bunch of other jazz, and i get 22mpg now which i didnt think was too bad.

[chucked]

You guys are all full of ****.

[AtvKid4Eva]

haha this guy must know it all. ^

[chucked]

I've had all sorts of different vehicles, S10's with V-8, s10 with four cylinders, cars with V-8's, cars with four cylinders, full trucks with V-8's trucks with six cylinders. Ive driven them hard and easy. I know what kind of fuel economy these get. On top of all of this I'm a mechanic, I've worked on Chevelle's, Corvettes, old trucks, brand-new trucks, mustangs, Camaros, Civics. I know what kind of fuel economy cars get. I also know how to properly calculate fuel economy.

[chris p.]

russellsroost,good luck with the cam swap if you go thru with it.i would check with "chucked" to figure out your mpg...after all,he CAN calculate. MERRY X-MAS GUYS !!!!!!!!!!!!!!!!!!!!!!!!!!!

[Tommy Warren]

Originally posted by chucked
I've had all sorts of different vehicles, S10's with V-8, s10 with four cylinders, cars with V-8's, cars with four cylinders, full trucks with V-8's trucks with six cylinders. Ive driven them hard and easy. I know what kind of fuel economy these get. On top of all of this I'm a mechanic, I've worked on Chevelle's, Corvettes, old trucks, brand-new trucks, mustangs, Camaros, Civics. I know what kind of fuel economy cars get. I also know how to properly calculate fuel economy.


chevelles, corvettes, camaros, mustangs, and CIVICS? why did you need to ruin a good list:macho

[yfzttracer76]

Originally posted by chucked
I've had all sorts of different vehicles, S10's with V-8, s10 with four cylinders, cars with V-8's, cars with four cylinders, full trucks with V-8's trucks with six cylinders. Ive driven them hard and easy. I know what kind of fuel economy these get. On top of all of this I'm a mechanic, I've worked on Chevelle's, Corvettes, old trucks, brand-new trucks, mustangs, Camaros, Civics. I know what kind of fuel economy cars get. I also know how to properly calculate fuel economy.

Can you please share how to properly calculate fuel economy?

[Tommy Warren]

Originally posted by yfzttracer76
Can you please share how to properly calculate fuel economy?

run your truck out of fuel then throw a gallon in the tank and see how far you can go.....carry a spare gallon to get back;)

[chucked]

Yup

[beastlywarrior]

rough estimate is to top it off the drive then top it off again and divide how many miles you went by how many gallons you put in im somewhere at 15 in my silverado and 13 with my dad driving and 17 in my blazer

[sly400ex]

That's better than a rough estimate if your mileage is accurate. But after you change tire size, gears etc.....if not properly calibrated, those are nothing but false numbers.

[Kickstarts-suck]

Never even mentioned what truck you drive op...

[russellsroost31]

its a 96 chevy k1500 z71 has the 5.7 whoretec with a 5.5 inch lift on 35" wrangler mtrs mounted on 15" vision warrior wheels it has true dual glasspack exhust with 45ed tips spectre cold air intake with a new RMP 4l60e tranny

[Kickstarts-suck]

LT4 corvette cam.

Hopefully your re geared?

[russellsroost31]

it has 373 gearing and what will that cam do for me

[chris p.]

get something thats going to make torque.i have the comp cam268h and it wants rpm more than anything but my bud had a comp 252 and he liked it better.his had a smoother idle as opposed to mine also.just my 2 cents...................