Mopar 225
#1595491
03/19/14 08:55 PM
03/19/14 08:55 PM
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Joined: May 2008
Posts: 305 CA
David Lee
OP
enthusiast
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OP
enthusiast
Joined: May 2008
Posts: 305
CA
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I know its crazy but I want to build a good 225 to go bracket racing. What is the best year block of these engines. I assume the engines that came in the eighties were thinner wall castings.
thanks
Ah...so many pedestrians, so little time...
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Re: Mopar 225
[Re: David Lee]
#1595492
03/20/14 12:06 AM
03/20/14 12:06 AM
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Joined: May 2007
Posts: 1,443 Maryland
Dads426
pro stock
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pro stock
Joined: May 2007
Posts: 1,443
Maryland
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I would start here: SlantSix.org
2012 422 Allstars NSS Champion 2013 422 Allstars NSS Champion 2014 422 Allstars NSS Champion
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Re: Mopar 225
[Re: slantracer]
#1595494
03/22/14 06:30 PM
03/22/14 06:30 PM
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Joined: Jan 2003
Posts: 3,053 Bowling Green, KY
cudaboy
master
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master
Joined: Jan 2003
Posts: 3,053
Bowling Green, KY
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Quote:
Forged crank '75 and older, up the compression. Build a mild 60-62 Valiant or Lancer and run 12:50's all day and not work on it. Get more involved, run 10:90's and work on it all the time. Be different, not just another too many cylinder race car!
What would it take to get one to run 11.50's? There are a couple of tracks that run that index and i think that is what i am shooting for.
Dennis
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Re: Mopar 225
[Re: cudaboy]
#1595495
03/22/14 06:36 PM
03/22/14 06:36 PM
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Joined: Jan 2003
Posts: 5,875 communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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Quote:
Quote:
Forged crank '75 and older, up the compression. Build a mild 60-62 Valiant or Lancer and run 12:50's all day and not work on it. Get more involved, run 10:90's and work on it all the time. Be different, not just another too many cylinder race car!
What would it take to get one to run 11.50's? There are a couple of tracks that run that index and i think that is what i am shooting for.
Dennis
imho first thing i would want is a flyweight car to put it in
i had a nice /6 in parts that i sold years ago and wish i had kept it. was adapting one of the old buick turbos to it.
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Re: Mopar 225
[Re: cudaboy]
#1595496
03/22/14 07:57 PM
03/22/14 07:57 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
Forged crank '75 and older, up the compression. Build a mild 60-62 Valiant or Lancer and run 12:50's all day and not work on it. Get more involved, run 10:90's and work on it all the time. Be different, not just another too many cylinder race car!
What would it take to get one to run 11.50's? There are a couple of tracks that run that index and i think that is what i am shooting for.
Dennis
A super light car first thing... I dont recall how the old 4 bbl manifolds worked... but thats something to think about(if you can find them now days)
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Re: Mopar 225
[Re: MR_P_BODY]
#1595497
03/23/14 02:43 AM
03/23/14 02:43 AM
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Joined: Jan 2003
Posts: 20,212 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,212
Park Forest, IL
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11:50's on motor is a tough nut to crack, especially when conditions are hot or humid. Forged or cast crank don't really matter, one is just about as good as the other. Good piston/rod combos are easier to find for a forged crank though. As with most any motor headwork is the key. A Slant is tricky, because it is very easy to overport the head and all that does is creates reversion problems. It is also easy to put too big of valves in it, The small bore really shrouds a big intake valve. Compression needs to stay around 11.5ish or it will eat head gaskets like crazy. Cam is pretty critical too. Too much and it's a pig, too little and you leave a lot of power on the table. Alcohol is almost a must too. A rollerized 904 is almost a must for that fast unless you run a stick. A stick can be worth almost 1/2 second, but consistency may suffer and breakage will visit often. As everyone has already said, you need a LIGHT car. 2000-2100 would be ideal, but hard to get to without a tube chassis car or a 61-62 Valiant/Lancer. Finding little things that will get you a couple hundredths here and there will become a passion. Your weather station will be your best friend and worst enemy on the same day. Plan B is build a fairly stock motor and turbo it. Consistency will suck, but it will be rocket fast and relatively trouble free when you get it dialed in. If you're like most of us Slant racers you will follow plan A, and then wonder "Why in the hell did I ever do this when a smallblock would have been easier and cheaper?".
"Everybody funny, now you funny too."
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Re: Mopar 225
[Re: slantzilla]
#1595499
03/23/14 11:18 AM
03/23/14 11:18 AM
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Joined: Jan 2003
Posts: 3,053 Bowling Green, KY
cudaboy
master
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master
Joined: Jan 2003
Posts: 3,053
Bowling Green, KY
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Quote:
61-62 Valiant/Lancer
Well, that's what I am looking for, so I guess I'm heading in the right direction. It also wouldn't have to be n/a, I could spray it a bit as long as it didn't hurt consistency.
It probably just another one of my pipe dreams though, who knows.
Dennis
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Re: Mopar 225
[Re: slantzilla]
#1595500
03/23/14 11:37 AM
03/23/14 11:37 AM
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Joined: Jan 2003
Posts: 3,053 Bowling Green, KY
cudaboy
master
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master
Joined: Jan 2003
Posts: 3,053
Bowling Green, KY
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Quote:
Plan B is build a fairly stock motor and turbo it.
I recently came across an old friend that I haven't seen or heard from in 21 years on FABO. That is what he did with his Valiant. I don't think his is a race only car though. I am looking forward to seeing it this spring.
Dennis
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Re: Mopar 225
[Re: dogdays]
#1595503
03/26/14 08:34 PM
03/26/14 08:34 PM
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Joined: Feb 2003
Posts: 8,020 Pangaea
B5 Bee
master
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master
Joined: Feb 2003
Posts: 8,020
Pangaea
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Quote:
To the OP:
Your assumption that later slant six blocks would have thinner walls isn't correct. There seems to be no best year for blocks, if you are going to spend major bucks on a block I'd sonic check it first. And because Slants are bore-limited, I'd look for one that could be bored out more if your are going NA.
R.
Bore limited? How much? All blocks are bore limited.
Just about any slant block will go +.100. I know of one that went +.190 without hardblock.
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Re: Mopar 225
[Re: B5 Bee]
#1595504
03/27/14 04:41 AM
03/27/14 04:41 AM
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Joined: Jan 2003
Posts: 20,212 Park Forest, IL
slantzilla
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 20,212
Park Forest, IL
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Quote:
Quote:
To the OP:
Your assumption that later slant six blocks would have thinner walls isn't correct. There seems to be no best year for blocks, if you are going to spend major bucks on a block I'd sonic check it first. And because Slants are bore-limited, I'd look for one that could be bored out more if your are going NA.
R.
Bore limited? How much? All blocks are bore limited.
Just about any slant block will go +.100. I know of one that went +.190 without hardblock.
The +.190 block is still running. It's in a buddy's Dakota truck.
I have seen quite a few go +.135". Anything over +.100" should be sonic checked.
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