427 or 350?
Yes a SB will be cheaper to build, you can get a ton of power out of a SB, and the car will handle better on a road coarse.
But this picture tells me a story:
350 SB vs 427 BB
From various search, I have found that it is ca. 60 kg lighter than the Big block, and will handle 370 hp without comprimising reliability, not to mention better on gas as well. (Based on what I could find, the SB 350 will average about 17 mpg, where the BB 427/454 will struggle to get more than 15 mpg, and thats on highways).
What I can hear (on videos posted on youtube atleast) they both sound the same too.
on a 2nd note; I might go as young as 74, if I am to get one in a good shape, while remaining cost focused. Newer than 75 are too low on power for them to be worthy of consideration IMO, and anything newer then 76 will not have a status as a "vintage car" and I will have to pay full tax on it, and this is Denmark that I live in, which is one of the most expensive countries to own a car in.
1. BB cars are going to generally be more expensive.
2. BB cars are generally going to have more HP and more important for street use more torque.
3. BB cars will generally be more desireable from a collector point of view although there are exceptions such as the SB LT1's
4. SB cars are more plentiful and easier to find and generally less expensive (LT1 cars being the exception)
5. SB cars have less weight in the front and handle better because they are more evenly weight distributed
6. Parts availability on both is excellent but you can find pretty much ANY part for a Chevy SB ANYWHERE.
7. you mention cars newer than '75's are not as good because of lower power. This is true about the power levels.... but 74 thru '82 cars are also generally less expensive than the earlier chrome bumper cars of '68-72 and the savings could go towards some basic engine modifications to gain more power so a '74-'76 could probably be bought for a very reasonably price and than the engine can be made more powerful and still keep the price the same or less than you would pay for an earlier model year car.
8. your milage estimates on both the BB at 15mpg and the SB at 17mpg are "generous and hopeful" in my opinion.
My '65 327 (even smaller than the 350's in a C3) averages apprx 12mpg and thats only if I don't get too happy with the throttle pedal. I can easily make that milage get cut in half if i'm "having fun" and if you see 12mpg on a BB you are really going easy with it
Around town, well lets just say I don't pass to many gas stations while having "fun".
http://forums.corvetteforum.com/help...available.html
Other than that I have mostly tried google, but what I found was just what I previously wrote, that people claim the BB being the one to go for, but thats only based on it being superior in power.
Personally I don't think an engine i better, just because its more powerful.
But if this is a common question, I sudgest that this shall be made a "Sticky" or atleast put under one of the Stickies?
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This SBC 427 Dybo'd at 565hp. It is set up for daily use. A wilder set up would probably get you 600hp. It is being installed in my C2 Coupe along with a Tremec 6sp. The 6sp has a final drive of .50.
For more of everything (except handling); more brute force, expense of parts, fuel consumption, tire wear, AND appeal at car shows...nuttin like the BBC.
I like cruising on a winding road over drag racing, tho I do both. I like power too (someone here doesn't??) So, I'm always torn when having to choose. In the end, I try to have both, to some extent. And, for that I've had and seem to lean toward the SBC, either a slightly cammed 350/350, or a 383 stroker to really nip at the heals of the BBC w/o the BBC expense or handling sacrifice.
My wife's love is her 69 L46/M4 vert and I love that car too. But, on the other hand, speaking of having it both ways, my "little" 32 valve, DOHC 350 in my 90 ZR-1 is the most ferocious car/engine I ever owned or drove - BBCs included! But, that's a different topic completely.
Your mileage may vary.
P.
Last edited by Paul Workman; Jan 18, 2012 at 08:31 AM.
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The 427/454 engines take up a lot of space in the engine compartment. If you've got air conditioning, it's really TIGHT in there.
For my 70, I've got an all aluminum big block. A little overkill, a iron block will be OK. To get more space in the engine compartment, I removed the stock AC. Bought a Vintage Air AC. The evaporator is behind the passenger's front interior panel. Makes a lot more room in the engine compartment. To make more room, I also bought a hydroboost power brake assist. The hydroboost allows higher intake valve covers that won't interfere with the stock vacuum power brake booster.






















