1966 Chevelle Project

OK Grumpy..... You have my attention.

What do I look for when shopping for a BBC. You kinda know what I'm after.
What year blocks and such.
Will the 200r4 still hold up to a BBC? cause I know a guy! :)

EDIT: I just found alot of info from a search on this site so.. I'm going to buy another set of reading glasses!:):D
 
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I helped a friend install them, heavy bass sound at idle, barks hard at wot, first guess is a 440, but its a stock 318 with headers :D
Highway cruising is quiet inside, but not like stock of course.
 
The wife loves the sound and lope of my race engine....from a distance:D
But it has open 1 3/4 over the frame headers with 31" of 3 1/2" collectors.
Sound is awesome bouncing off the woods! If I could wrap that sound into a 3 1/2" full exhaust
it would be nice. But ....again, her engine won't have the compression that it has either .

I am along ways from a final decision ....so it's just conversation for now.
 
Unforgiven
because your unlikely to be racing the BBC engine, in that chevelle,
and you'll obviously not be spinning that engine in excess of maybe 6000 rpm max
(this is ideal for a 454-489 displacement engine, with oval port heads in the 265cc-290cc port size)
you certainly want to both keep costs reasonably low and you don't need the expense of race or aluminum cylinder heads.
but of course aluminum heads do weight considerably less and are less prone to detonation,
you'll ideally want a fairly mild cam (ideally a hydraulic roller version)
to maximize torque in the lower and mid rpm range, and a reasonably low compression to use a supercharger
something similar to this list
id find and have a basic 454 block rebuilt with new rings and bearings
you should be able to do that for under $1200 from a local machine shop
add the roller cam & valve train, better heads and the super charger and 550-600 hp would be very easy to surpass.


its not cheap, but it is rather easy to do with off the shelf parts


https://www.summitracing.com/parts/wnd-6521-1/make/chevrolet

https://www.speedwaymotors.com/shop/comp-cams-chevy-big-block-v8~131073-10016-10?msclkid=363fb0c61c3710719be9d060bf07beb8&utm_source=bing&utm_medium=cpc&utm_campaign=SMI - Dynamic (Jan7_2019) (T&B)&utm_term=/shop/&utm_content=Shop


https://www.summitracing.com/parts/tfs-41310001-m13

https://billmitchellproducts.com/pr...l-port-marine-assembled-click-here-more-info/
https://www.jegs.com/i/World-Products/955/030040-1/10002/-1
 
Then I would have to under drive it. Would that not make the bottom end lazy with low compression?
My understanding is that the engine will not see much boost until WOT.
I was thinking that the smaller blower would spin just fast enough to seal the rotors at lower speed,
and be right on the edge at the 6000 mark...which we have to keep in mind...the engine will rarely see
the top side of 4000 with her driving.
I have learned from my truck engine ..That by installing a larger or smaller pully on the crank will
help dictate how fast the boost will come on .
By installing a 7" lower pulley on my truck engine...I gained a tremendous amount more torque lower in the RPM range because the crank was spinning up the blower faster at low RPM.
A smaller lower pulley would spin the blower
slower and not build boost until higher up in the RPM range. So that would help with a daily driver, and also cruising at highway speeds.
I want to make it so she can use 91 octane for daily driving...and install a different tune and e85 fuel
for some deliberate saturday night fun.... if they still do that anymore.
Yes.. I do plan on using another EFI system for fuel delivery.
I also think it would be better for her having the blower not sit so high out of the hood.

I agree that the bigger displacement engine would dictate a larger blower...but it ain't being built to race.
This is a "cool grandma car" if you will. :):)

Edit: I do realize that a smaller blower will heat up faster at top end.
But I have to keep focused on the cars application.
 
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the larger 671-or 871 super charger pumps significantly more air at all rpms levels,
even lower rpms
thats the route ID go if building the engine
 
Grumpy should he be looking more for a tall deck block for torque or a short deck block I know the BBC comes both ways I think
 
I see were I was mistaken and miss-leading about the blower..

The 250 size blower in the link I posted shows TWO carbs needed.

I would have to agree with you Grumpy that in that situation it would be better to go with
a 6-71 .. the cost is not much different and you would get twice the air.

I only need and want to run 1 TBI unit.
I would like to only have the Enderle style hat sticking through the hood.

OR... something along the lines of the second unit down from the top in this link...
https://www.force-efi.com/price.htm

Yes it seems like that unit costs alot...but you have to look at what is all included in the price.
 
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theres zero question the 671 super charger 0r 871 super charger is a far better match to a 454 bbc engine,
than something smaller like a 177 or 250 sized supercharger on a 454 BBC
would need to be spun up to rpm levels , through pulley size selection choices
where its efficiency drops of significantly due to both increased heat and lack of air flow capacity,
keep in mind durability also, a 671/871 will last considerably longer requiring less maintenance.
remember theres a huge difference between the design of a RACE engine ,
where you want to maximize power at peak rpms,
and one built for long term durability and ,one designed for max torque in a useful rpm range,
youll use on a daily driven car.
lets assume you compare a 350 vs a 454
both built for about max power at about 3200 fpm in piston speed for near max durability
and lets assume you get about 1.5 ft lbs per cubic inch of displacement
a 350 have 3200 x 12/7=5486 rpm
a 454 have 3200 x 12/8=4800 rpm
hp formula
torque x rpm/5252=hp

350 x 5486 rpm= 525 ft lbs=548 hp --- 1078 cubic ft of air per minute
454 x 4800 rpm= 681 ft lbs= 622 hp--- 1224 cubic ft of air per minute
the 350 should get about 14% better mileage if driven at that rpm range

the bbc is spinning about 15% slower and has 74 more ft lbs of torque
at that rpm range,
thats at the 3200 fpm piston speed ,
but at the lower rpms, and you'll spend 95% of your time driving on the street at under 2000-2500 rpm,
the noticeably more robust torque of the BBC will make driving at much lower rpms and shift points,
much easier, so the real effective difference will be almost a wash,

in mileage,
yet the noticeably higher torque makes the BBC much easier to accelerate and cruise and pass in traffic,
and over time the smaller faster rpms the smaller engine spins tends to cause marginally more wear.
the BBC parts are more massive , stronger and less prone to stress/ wear,
thats the major reason commercial applications where they were trying to exceed 150k-200 k between any major maintenance,
\and why applications like dump trucks and busses,
that used super charged engines tended to go with BBC engines (366 and 454)
 
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I miss those old days, when all we thought about were cars and chasing the mini skirts.
Man, I loved it back then, girls wore sexy hose with dresses and you were a slight bend over away from seeing a nice ass!
images

Now women's legs do not separate until after their knees. Disgusting. Whatever happened to the thigh gap? I miss that.
 
Thanks Rick...yes it felt good to actually add something to the car instead of disassembling stuff. I felt it was a good place to start
given I haven't used my welder in about a year. I can only get better from here on out. The better I get with all the hidden
metal work....the more confident I will be when it comes time to weld in new exterior panels.



LOL!!!! I absolutely knew you would make that statement! :)

To be absolutely honest.... I have never even put a wrench on a BBC, let alone try to build one.
I would not know what I am looking for in heads cam selection and such.
It may be a myth...but I think they are more expensive to build also.

But... It may be the best way for a means to the end result.
I can't see it being cheaper though. I mean...I would still start with a full machined block that is purpose built
with all new parts.
Dart, Pro Assembled by Dart, Sportsman Chev BB Short Block
Look at these:
https://www.competitionproducts.com...ni-Dome/productinfo/DRT97341540/#.YKg7cnmWzcs
https://www.competitionproducts.com...ni-Dome/productinfo/DRT97341565/#.YKg7d3mWzcs
https://www.competitionproducts.com...w_119cc/productinfo/DRT97361565/#.YKg7gnmWzcs
 
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