Re: old 392 hemi?
[Re: rowin4]
#900044
01/09/11 04:55 AM
01/09/11 04:55 AM
|
Joined: Sep 2008
Posts: 2,840 Flint, Michigan
B1Fish540
master
|
master
Joined: Sep 2008
Posts: 2,840
Flint, Michigan
|
I consider the bore space as the indicator of small block or BIG block. heres is some info i got from the rodders forum: Quote:
325 Dodge hemi already has a 3.80" stroke. To get 390 cubes, you'd need about a 4.5" stroke.
Problem with the early Dodge hemi is that its bore center-to-center distance(bore space) - 4.1875 inches - is one of the smallest of any V-8 ever (the Ford 4.6-5.4 modular V-8 is smaller).
By comparison, a SBC is 4.40 inches, SB Mopar is 4.46, and a BB Mopar is 4.80 inches.
So all the early Dodge hemis are small-bore engines, and the small bore limits its cubic inch potential.
The early De Soto hemi was also limited in size potential, just not quite as limited as the Dodge. Its 4.3125" bore center distance you will note is still less than either a small block Chevy or Mopar.
And just FYI, the Chrysler 331-354-392 hemi had a 4.5625" bore spacing.
So, like Cab said, its in between a BB and a SB...interstingly, its actually about .200 closer to a small block!
|
|
|
Re: old 392 hemi?
[Re: polyspheric]
#900048
01/09/11 12:26 PM
01/09/11 12:26 PM
|
Joined: Jan 2007
Posts: 3,695 nc
emarine01
OP
master
|
OP
master
Joined: Jan 2007
Posts: 3,695
nc
|
Thankx Jeff... good info .... I see some around 416 cubes floating around. Can you get any rpm out of that set up, it seems like a small block with a long rod, Do they make lighter parts, Alu heads & intake? How far can you push the bore size? Are the factory cranks forged?
Last edited by emarine01; 01/09/11 12:43 PM.
|
|
|
Re: old 392 hemi?
[Re: Handygun]
#900050
01/09/11 02:34 PM
01/09/11 02:34 PM
|
Joined: Oct 2007
Posts: 4,209 New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,209
New York
|
The 426 designers didn't have the clean sheet of paper to work with, and the valve gear is a compromise to use as much RB tooling as possible.
Boffin Emeritus
|
|
|
Re: old 392 hemi?
[Re: polyspheric]
#900051
01/09/11 02:36 PM
01/09/11 02:36 PM
|
Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
super stock
|
super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
|
You can use sb spec springs in stock application, sb distributor, sb timing chain also.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
|
|
|
Re: old 392 hemi?
[Re: emarine01]
#900053
01/09/11 02:52 PM
01/09/11 02:52 PM
|
Joined: Mar 2005
Posts: 862 Iowa State fan
kilroy
super stock
|
super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
|
the Hot Heads guys made great power out of a 331 for the Engine Master challenge, given it was a single 4 but.... still NA
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
|
|
|
Re: old 392 hemi?
[Re: kilroy]
#900054
01/09/11 08:33 PM
01/09/11 08:33 PM
|
Joined: Jan 2003
Posts: 2,129 Vermont
TrWaters
top fuel
|
top fuel
Joined: Jan 2003
Posts: 2,129
Vermont
|
Think of it as a tall deck small block. An all new aluminum early hemi 392 block is due out later this year.
TR Waters
|
|
|
Re: old 392 hemi?
[Re: emarine01]
#900056
01/09/11 09:57 PM
01/09/11 09:57 PM
|
Joined: Sep 2008
Posts: 2,840 Flint, Michigan
B1Fish540
master
|
master
Joined: Sep 2008
Posts: 2,840
Flint, Michigan
|
Quote:
Small block Mopars give up 40 cubes to Chevy and 30 cubes to ford, I guess the new hemis are small blocks This old 392 hemi being in between sounds more like racing politics to me
no, the SB mopars actually are bigger than the Chev( and will accept a bigger valve), thats actually helped them in nascar. The SB mopars dominate in World of Outlaw racing as well.
|
|
|
|
|