Re: 408 SB or 406 BB
[Re: A/MP]
#2559757
10/06/18 08:17 AM
10/06/18 08:17 AM
|
Joined: Jan 2003
Posts: 4,437 Omaha Nebraska
Brian_wo
master
|
master
Joined: Jan 2003
Posts: 4,437
Omaha Nebraska
|
I have built a 416 SB and 431 BB,for me it’s BB all day long in a street driven car,it’s a lot like the difference in an old two stroke dirt bike and a four stroke,when you get that two stroke wound up it screams but the four stroke will pull your fat butt around in about any gear and just keep pulling.
I have hated every sb 4-speed car I have owned,doesn’t mean I didn’t have fun with them just preferred the bb grunt for cruising..
Take that 400,drop a 440 crank in it and it will be a lot more fun than the stock stroke version.
who is that guy?
|
|
|
Re: 408 SB or 406 BB
[Re: A/MP]
#2559970
10/06/18 05:23 PM
10/06/18 05:23 PM
|
Joined: Jan 2005
Posts: 12,478 Kalispell Mt.
HotRodDave
I Live Here
|
I Live Here
Joined: Jan 2005
Posts: 12,478
Kalispell Mt.
|
A 440 SB is just as easy as a 408 if you need more TQ but I can't even begin to get my 410 SB to hook in my dakota so see no reason to go even more cubes. Min e pulls like mad from idle through about 6500 absolutly no holes in the TQ curve anywhere.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
|
|
|
Re: 408 SB or 406 BB
[Re: justinp61]
#2560234
10/07/18 03:55 AM
10/07/18 03:55 AM
|
Joined: Jan 2003
Posts: 9,924 Weddington, N.C.
Streetwize
master
|
master
Joined: Jan 2003
Posts: 9,924
Weddington, N.C.
|
Agreed you can build a 440" smallblock as easily as a 408, 4.25" crank with 2.00" rod journals makes for a very light (1850-ish gram) bobweight.
That said with the new trick flow 240's out there, I'd like to try a 400 block, 3.52-ish offset ground 383 crank low deck with something like a 6.800" BBC .990 pin rod with the 2.200" journals, I think it would rev as high or higher then the smallblock with the same compression and cam, much bigger valves and it really wouldn't weigh a whole lot more overall, probqbly within 30 pounds of my 440" W2 Iron headed 440" (360 based) smallblock.
The only thing I don't like on SBM's is the lifter angle.
Torque won't be an issue with either combo.
|
|
|
Re: 408 SB or 406 BB
[Re: A/MP]
#2560251
10/07/18 09:43 AM
10/07/18 09:43 AM
|
Joined: Jan 2003
Posts: 10,088 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,088
Frostbitefalls MN (Rocky&Bullw...
|
If you want to go 9.50 to 9.70 at 3,000 or heavier, you will need 700 hp? Expensive with a smallblock. You will need great heads, a rollercam, and an aftermarket block. Going with a 400 block will get you the power cheaper. At this stage of performance, weight reduction rule really comes into play. Getting wieght down to 2800 to 2900 pounds from 3200 is going to lower the hp requirements from 700 to 625 or so, much cheaper to get to.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
|
|
|
|
|