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Old 01-08-2009, 02:22 PM
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inline 6, V6, or V8

Question is what engine to put in my '46 Chevy Coupe. I know a lot has to do with personal preference but, my primary goal is to build a reliable driver that doesn't break me at the gas pump or in replacement parts. Is there that big a difference between the inline 6 and the V8? Are there motor mounting kits for V6's?

I'm keeping the original suspension for now.

Thanks for the input.

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Old 01-08-2009, 03:43 PM
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Is there that big a difference between the inline 6 and the V8?
Ayuh,.... I'd call it a Huge difference.....
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Old 01-08-2009, 04:20 PM
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a V8 with EFI would do decent on gas.
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Old 01-08-2009, 04:34 PM
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Whatever engine you use, you are hauling around about the same weight, which is going to keep mileage about the same. If you are looking at mileage as your biggest priority, I would be looking at your fuel injection system........

Personally, I think a v6 is going to get the best mileage of the 3........
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Old 01-08-2009, 05:15 PM
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Thanks for the replies Poncho and Gunner! Judging by Bondo's reply, looks like he totally missed the point of the question...

Do any of you know of a engine-frame mount kit for a V6 in a fat fender Chevy?
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Old 01-08-2009, 05:32 PM
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The 4.3 V-6 and the SBC are reputed to use the same mounts..

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Old 01-08-2009, 06:41 PM
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My motor mounts, when I get there, will be made by me. That is at least the support part, the rubber mount itself will be an AZ item. I'm putting a 4.3l V6 in a '47 Chevy coupe.

If you need to buy them, you can get them at about any hot rod shop as the V8 mounts will be the same.
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Old 01-08-2009, 07:39 PM
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r u just changing out the motor from an otherwise running car or is this a ground up build.
We need more info.
If just changing the motor I would put in a I6. . Or rebuild the one in it. In the mid 60's my friend had some chevy I6's that souped up would take out some stock V8's.
Now that would be something.
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Old 01-08-2009, 09:41 PM
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well most I6's aren't known for their mpg....I do like the 4.3 idea tho. Find one, put in an economy cam and EFI. Find someone that is skilled in tuning the EFI computer (or learn it yourself ) and you will probably be amazed at the results.
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Old 01-08-2009, 10:53 PM
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Cape Cod Bob, I'm trying to build a low-buck driver. I am installing a disc brake kit to the original suspension with power brakes, replacing the rear springs with a chassis engineering kit, and of course, trying to decide on the engine...

I do like the V6 idea. Thanks to all for your input and assistance!
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Old 01-09-2009, 05:40 AM
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What I did was buy a 1992 2WD S-10 Blazer for $900.00. That gave me the engine, trans, wiring, computer, AC, efi etc as well as master cyl/booster, seats and other parts. I used a rear end from a slightly older 4WD Blazer as it's 59" (my '47 is 60") and the same gear ratio that was on the 2WD. It doesn't have ABS stuff either.

I am just starting the rebuild on the 4.3 and asked some questions and got some reeally nice answers in a thread in the engine forum. ( Some 4.3 Rebuild Questions )
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Old 01-09-2009, 08:16 AM
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Something you need to keep in mind, since mileage is apparently a concern....a V-6 and a straight 6 are basically the same. Both are 6 cylinders, just in a different configuration. One main drain on gas is how hard a given engine has to work to move the vehicle around. Up to a point, a larger displacement engine will not have to work as hard to get you around.

I firmly believe a later-model, fuel injected, efficient V-8 will get better mileage and offer better performance than either of the 6's, especially if you put power steering, A/C, and the usual accessories on it.

You should have no trouble with either motor mounts, or enough room in the engine compartment for any of your combinations, but I'd go with the V-8.
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Old 01-09-2009, 08:25 AM
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Opinions, they are like belly buttons, everyone has one.

Here's mine:

You are building a "weekend driver", or a "daily driver", makes a big difference to some people. Me personally, if I am only going to be driving it on the weekends, I'll be damned if it is going to be "just like" driving my daily driver with EFI and power windows and all that crap. It is going to be basic, kinda like an old car, ohhhhh, it IS an old car, perfect.

The difference between putting in a inline six and a EFI V8 is HUGE, HUGE!. Difference in time, money, skills, HUGE difference.

The stock six, babbit pounder, expensive to rebuild. I would be thinking about a 54-59 235 a little warmed over with a cam and intake with a few carbs. A four speed or five speed from an S-10 is popular behind them.

No serious mods to do it, it fits right in there like it was meant to be, because it was meant to be.

And, there are a ZILLION SMC powered cars, who needs another one?

Just my thinking....

Brian
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Old 01-09-2009, 09:27 AM
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it all boils down to the actual TQ force applied to the tires to move-accelerate the car weight....
so:
tranny (gears ratios) choice and rear gears ratio choice (and tires diameter) are critical to determine best acceleration with least gas consumed....

I can't think of a exact/close match example (for weight and cubes) but just for the idea:
the last GM 4.2L I-6 Trailer Blazer is darn close to a 4.3L V6 Jimmy and darn close to a 5.0 V8 Explorer for performance and mpg...
why??? what's different???
the specific tranny ratio's and rear gears chosen to work with the motor package power band design....

the math is simple:
available flywheel TQ per rpms X tranny gear ratio X rear gear ratio =ft/lbs of force on the tires to accelerate the weight....
it's a balancing act of least load on the motor due to lower gears force multiplication for least gas needed (less load=higher Hg=leaner) versus rpms needed to have enough TQ available...

the factory ratio's choices are a compromise so the car will work decent regardless of terrain or altitude or climate...
(depending on where and how you want to use the car it can be improved,,,often with just a tire diameter change)

leave the motor stock,,, it is designed for street rpms best power per rpms....
(just tweek the timing which is a compromise)

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Old 01-09-2009, 09:50 AM
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Here's one more dare-to-be-different opinion. Since the engine bay is currently configured for an I6, get the Vortec 4.2 liter DOHC I6 from a newer Chevy Trailblazer. 275 HP/275 ft-lb net.
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