Which gets better mileage? 305, or 350?

[Captkaos]

Newer vehicles have components in them that were designed to run on synthetic oil
Older vehicles were not, in fact if you do a search (when we get it fixed) you will find that some of the "lube" that was once in old oil is being phased out, and a few members have seen the effects of this.

[eventhorizon66]

Newer vehicles have components in them that were designed to run on synthetic oil
Older vehicles were not, in fact if you do a search (when we get it fixed) you will find that some of the "lube" that was once in old oil is being phased out, and a few members have seen the effects of this.

I guess you are referring to the disappearance of ZDDP and its affect on flat tappet cams.  I'm considering a roller cam when I swap cams, but it's just too much $$$.

I thought that synthetic only requirements were reserved for exotics like the Vette, Ferrari, Porsche, etc.  You learn something new everyday.  I guess that's just one more reason never to consider owning a Trailblazer or a Lincoln MKX.  LOL.

[dumbucket1]

my 84 k5 blazer has had a 305, 267, 350, and a different 305 in it, all stock, all with quarajets. Every engine got the same exact mileage in this blazer.

[Stewart G Griffin]

That's what i'm suspecting;  If all of the factors are equal----same compression, heads, cam etc. then i think the 305 will get better mileage than a 350 in a fullsize truck.  The only diff between 305 and 350 is the bore size?

Or, if the quadrajet is used, the engines may get identical mileage.  Although that somehow does not seem possible?

[Dragon]

I thought that synthetic only requirements were reserved for exotics like the Vette, Ferrari, Porsche, etc.  You learn something new everyday.  I guess that's just one more reason never to consider owning a Trailblazer or a Lincoln MKX.  LOL.

Originally it was, but the stricter Emissions Standards and Such over the years, have pushed everything up in Automotive Manufacturing....  The Engines today are produced in such a way now, some Manufacturers have begun Voiding Warranties of those individuals who don't follow their Service Recommendations to a T(Such as trying to use a Non-Synthetic/Blended Synthetic, when a Full Synthetic Only was Specified).....

That's what i'm suspecting;  If all of the factors are equal----same compression, heads, cam etc. then i think the 305 will get better mileage than a 350 in a fullsize truck.  The only diff between 305 and 350 is the bore size?

Or, if the quadrajet is used, the engines may get identical mileage.  Although that somehow does not seem possible?

Again that really depends on what the Engine was used in.....  In dumbucket1's case his exerience was with a Fullsize Blazer, had it been a 4X4 Fullsize pickup, the 350 would have gotten the better gas mileage....  Now if he had say a SWB, maybe LWB C10(C20 would be pushing it), the 305 would get the better gas mileage as it wouldn't be dogging as much as it would in a 4wd.....   Also if if you a Midsized Car, say a Monte Carlo, the 267 would get the better MPG's than the 305 and 350.... If it was a Fullsize Car/Sedan, the 305 would get the better MPG's, as the 267 would dog too much(Although make it a Multi Port Fuel Injection 265Ci, it would get better Gas Mileage than the 267 Carb'd 305/350 Carb'd/TBI/MPFI )....

[Skunksmash]

Newer vehicles have components in them that were designed to run on synthetic oil
Older vehicles were not, in fact if you do a search (when we get it fixed) you will find that some of the "lube" that was once in old oil is being phased out, and a few members have seen the effects of this.

I guess you are referring to the disappearance of ZDDP and its affect on flat tappet cams.  I'm considering a roller cam when I swap cams, but it's just too much $$$.

I thought that synthetic only requirements were reserved for exotics like the Vette, Ferrari, Porsche, etc.  You learn something new everyday.  I guess that's just one more reason never to consider owning a Trailblazer or a Lincoln MKX.  LOL.

Soon enough, if you buy a new vehicle you wont have a choice. If the trend continues the way it has for the last bit.

[eventhorizon66]

  All of this environmental awareness crap is starting to give me a headache.  I should have been born in the 40's when hot rodding was in its infancy.  My next project is a time machine.  Does anyone here know anything about DeLoreans?

[Lt.Del]

Does anyone here know anything about DeLoreans?

Yes, I grew up in the 80's and yes I watch Back to the Future.  Two words:  Stainless Steel

[VileZambonie]

Power to weight ratio dictates what engine will be more economical. Delorians were POS's and I saw many catch on fire and burn up. Not so cool when everyone is looking at your time machine go back in time to ash. lol

[Lt.Del]

Take a Delorean and throw in a 383 stroker engine....Oh Yeah!! 

[Dragon]

All of this environmental awareness crap is starting to give me a headache.  I should have been born in the 40's when hot rodding was in its infancy.  My next project is a time machine.  Does anyone here know anything about DeLoreans?

Sure just check out the new Website for Parts and Etc...
http://www.delorean.com/

[Skunksmash]

Its a cool car for sure. I would have liked to see what the next gen of that car would have been. Surely there is some record somewhere of what they had plans for. As soon as the finish one gen, they usually get to work on the next. There must be some stuff left over somewhere that could show us what it might have looked like.

[eventhorizon66]

I don't know that a second gen was ever in the works.  It all kind of came to a crashing halt when the owner of DMC was arrested for drug trafficing (or something along those lines).

Oh and BTW.  I meant the DeLorean Back To the Future reference as a joke, sorry this turned into a DMC discussion thread.  I don't see anything really special about this car then or now (the new official world headquarters is just down the road from me, where there are offering them as both used and newly refurbished cars).  They had a decent chassis because it was stolen from Lotus, but they were under-performers in every other sense (those PRV V6s were garbage).  When they were new, you could grab a Mazda RX-7 for something like $10K less and smoke a DeLorean.

[Skunksmash]

Well, to get sorta back on topic, i found out that you can use synthetic oil with flat tappet cams, if you use a zing additive. So that way you get the benefits of getting to use synthetic oil without doing any harm.

[Dragon]

You can also get away with using a good Synthetic Blend, that will allow you some of the benefits of both worlds....   Basically you get an Oil that allows you less friction from being thinner than conventional oil, but at the sametime still has alot of the Various Minerals Older Engines(90's and earlier, under 100,000) still need....   Since it is a Blend, it won't be as thin as true Full Synthetics, therefore it won't find as many of the areas that are leak prone...