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Author Topic:   383 vs. 434
crc1124
Dirt Maniac

Total posts: 143
posted March 12, 2005 08:59 AM  
I would like to hear your guys opinions on these two engine combos. I will be running a 13.5:1 383 this year at our track. It's a 1/4 mile paperclip medium banked track that dries out by the features. I've just found out that there are guys in our class running the 434's.
Am I going to be at a big disadvantage? I know there are alot of other things to take into account. Gears, tires,handling, etc...
But just as far as torque and horsepower.
And also what about 406's and 421's?

Donnie Ross
Dirt Freak

Total posts: 264
posted March 12, 2005 09:21 AM  
if you have a good 383 I would not be to worried unless it is unlimited tires and suspension. most people build way more power than they can use anyway.

crc1124
Dirt Maniac

Total posts: 143
posted March 12, 2005 09:35 AM  
We are allowed to use racing springs and shocks but have to keep them in stock locations. We have to run dot tires but are allowed racing retreads. No direct drive hook-ups. I will also be running a quartermaster 7.25 triple disc clutch.

Racer111
Dirt Freak

Total posts: 259
posted March 12, 2005 09:44 AM  
How heavy is the car ?

speedy46
Dirt Maniac

Total posts: 165
posted March 12, 2005 09:56 AM  
the track champion were i race (outlaw track) had a pimped out 383 and he was just as fast as the 434's on tacky & dry tracks so if u have nice parts in it you will be fine

crc1124
Dirt Maniac

Total posts: 143
posted March 12, 2005 10:06 AM  
The car is about 3200lbs. My engine has JE pistons, Crower h beam rods, Scat lightened 4340 forged crank. All my bolts are new ARP. 4 bolt main, internally balanced crank and the whole rotating assembly has been balanced. I wanted to do it right and a guy I used to talk to that ran a late model helped point me in this direction.
We have to run a 2bbl carb so I have a 4412. The heads have to be stock so I'm running a set of 492's with angle plugs and they have been ported and polished. I,m running a victor Jr. intake and a 1" phenolic spacer/adaper.

[This message has been edited by crc1124 (edited March 12, 2005).]

Donnie Ross
Dirt Freak

Total posts: 264
posted March 13, 2005 06:07 AM  
you will be fine a 434 has a hard time breathing thruogh a 2bbl.

iowatoolman
Dirt Freak

Total posts: 369
posted March 15, 2005 12:11 AM  
if cubic inch is what your worried about DON'T last year i ran a 331 and spanked alot of 406's and 383's just build it right and drive the **** out of it

and to really make them mad i painted it hot PINK...and told them it was a 283 LOL

drive hard or drive home

the king
Dirt Full Roller

Total posts: 46
posted March 15, 2005 10:46 AM  
What kinda heads, intake, carb and cam did that 436 have on/in it to make 632hp on gas? Was it a stk blk?

Been thinkin about making a 434 for some time now, and seen your post and that perked my interest.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted March 15, 2005 12:58 PM  
iowatoolman has the right idea. If you are stuck with a 2 barrel then going bigger isnt going to help. The bigger cubic inch engines will get choked off sooner because the carb is a big restriction. Id stay with the 383 and forget about the 400+ stuff, escpecially if you are running stock blocks.

chomme
Dirt Freak

Total posts: 300
posted March 15, 2005 10:10 PM  
383 will do fine. We beat several so-called 421's and 434's with our 383 a couple years back. I built the motor for a two day race, so it was not built with the best of parts. Scat cast crank, 5.7" gm PM rods, sealed power hyper's, a mwms camshaft, and a set of 291 fully ported angle plug heads (that my friend that works at a steel recyclers picked up, I pinned them in three places and ran them). Turned the thing 7400rpm's the first night...car had suspension problems. Second night...had the whole field lapped and the second place guy was running a 434 in a 2800lb camaro. He came over and had the tech guys check my suspension and such and they were dumbfounded to find I was legal. After that, ran the motor on a dyno and found it was putting out about 550HP...which was plenty to run with the best of them in that class (750 4bbl, super victor). To sum it up...I think the 383 should work great.

chomme
Dirt Freak

Total posts: 300
posted March 15, 2005 10:11 PM  
Do the rules state the 2bbl has to be a 4412? Do they allow carb mods? If a 4412, run that with the HVH tapered spacer for a two barrel, that'll pick up some HP and keep with the 4412. Otherwise, go to a 6425 650 cfm 2 bbl or even a C&S 890 2" bore 2 bbl.

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