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Re: stock 400 build
[Re: bigblock4x4]
#835889
10/26/10 08:29 AM
10/26/10 08:29 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
my buddies buildin a 74 dart sport with a 440,his is definatly gonna run better,but i'm always messin with him,we ARE definatly gonna run em at the strip a little,i just want to get the most outa what i got,no since in not racing,that's what it's all about oh and it's a 1/8th mile track so i should be able to maybe get away with a little more gear if recommended i said 3.91's but maybe 4.10's???
not much difference in those. It depends on the cam you have. You could always go w/ a shorter tire. That thing isn't going to pull many rpm's. I'd lok at a cam that works well from off idle to about 5200 max. You could always buy a used S/C unit off of 'bay. SBC or Furd would work fine. It'd give you 5-6psi off boost and really WAKE that thing up.
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Re: stock 400 build
[Re: superbyrd]
#835890
10/26/10 09:23 AM
10/26/10 09:23 AM
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Joined: Jan 2003
Posts: 75,324
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,324
A gulag near you.
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Quote:
lots of folks come on here,asking for help,and answers,wanting input on how to make power,most on a budget,or not alot to work with,and the same ole' answers file in.
you guys who swear by the "experts",and magazine "gurus",ever wonder how in the world guys 30-40 years ago ever got a car to move down the track,or make a single horsepower,without your "quench" this,and stroked that,and so and so says this and that won't work???? must have been some kind of miricale. must have never happened.amazing..............
It's called EVOLUTION , might as well go back to flatheads with your backwards thinking.
Go and build a 440" motor with 12.2 compression, open chamber iron heads , NO QUENCH and run it on today's 91 octane fuel and get back to us on how well it runs ...
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Re: stock 400 build
[Re: JohnRR]
#835891
10/26/10 09:45 AM
10/26/10 09:45 AM
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Joined: Jan 2003
Posts: 8,949
Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,949
Holly/MI
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Good thread guys! Very spirited!  Remember, headers ADD torque at ALL rpm's. A difference you can feel. I'm also of the compression-over-flow crowd. BUT, I never install 516's with the 1.60 exh. valve. Always add the 1.74 valve and a quick bowl/intake/exhaust template porting and YOU WILL feel a difference in the whole rpm band. 13.08 at 106 mph with a 3600 car with my favorite "boat anchors.  
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: stock 400 build
[Re: superbyrd]
#835892
10/26/10 10:59 AM
10/26/10 10:59 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
and the difference in 2 1/4 over 2 1/2. on your car,with the weight and all things considered,2 1/4 will more than suffice. i don't know how many people you see on this board,and alot of other places,that are barely making 400hp and actually believe they "need" 2 1/2 or 3" mandrel bent exhaust on their cars.lolol really. well,i guess they might think that if they listen to all that "magazine,perfect world,on paper,westech dyno proven" bullcrap. i read that stuff for what it is.......good reading. then i go with what works in the real world,on the street,etc.
point of reference...our 3.8L '06 caravan has a 2.5" mandrel bent exhaust stock from the factory....
dual 2.5 will be about right for this combo, I wouldn't go smaller, especially if compression bent.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: stock 400 build
[Re: bigblock4x4]
#835893
10/26/10 09:07 PM
10/26/10 09:07 PM
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Joined: Nov 2006
Posts: 1,463
oklahoma
forphorty
pro stock
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pro stock
Joined: Nov 2006
Posts: 1,463
oklahoma
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Quote:
my buddies buildin a 74 dart sport with a 440,his is definatly gonna run better,but i'm always messin with him,we ARE definatly gonna run em at the strip a little,i just want to get the most outa what i got,no since in not racing,that's what it's all about oh and it's a 1/8th mile track so i should be able to maybe get away with a little more gear if recommended i said 3.91's but maybe 4.10's???
A good converter and sticky tires, if you have them and your buddy doesn't, he will lose.
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Re: stock 400 build
[Re: superbyrd]
#835896
10/27/10 12:28 PM
10/27/10 12:28 PM
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Joined: Jan 2003
Posts: 8,949
Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,949
Holly/MI
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Yeah, I think many forget about the "build a better airpump" theory. Good compression is there in ALL rpm's ranges and the 516's nominally smaller porting may actually create a higher velocity port too. Especially for the 383/400 bore stroke combination.
Low compression seriously hurts low end with a 230+ duration at .050 and the 383/400 is a relatively short stroke motor compared to any other big block and even a 383 SBC.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: stock 400 build
[Re: bigblock4x4]
#835898
10/28/10 08:49 AM
10/28/10 08:49 AM
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Joined: Jan 2003
Posts: 8,949
Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,949
Holly/MI
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Check the cc's of the heads and we can help you further.
If the 452's are equal to the 516's use the 452's. Reason being, hardened seats, 1.74 exh. valve, same compression, slightly better flow.
Ideally you want the compression of the 516's (w/the milled 452's) with the benefits of the 452's. And sounds like they are close.
If both sets of heads were equally worn and untouched, I'd update & freshen up the 516's. Just my opinion.
Cc'ing a set of heads can be as easy as putting some old spark plugs in, filling the comb. chamber with Play-Doh, cut the clay level with the deck surface, and then pull it all out and drop it in a beaker/measuring cup with a known amount of fluid. What ever it registers as a new amount is your "cc's".
Last edited by Dean_Kuzluzski; 10/28/10 08:53 AM.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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Re: stock 400 build
[Re: superbyrd]
#835903
10/29/10 07:21 AM
10/29/10 07:21 AM
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Joined: Aug 2007
Posts: 1,819
Middle of A Field
OrangeProwler
top fuel
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top fuel
Joined: Aug 2007
Posts: 1,819
Middle of A Field
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Quote:
if they are the originals,i don't think i would want to use the "stock" valve springs with either cam choice.
I don't understand why I couldn't? The motor is low mileage unit and it looks okay on the inside from what I can see. My 318 got the K6900 cam when it had around 170k miles and using the stock springs and still is going alright other than the usual high mileage issue.
My car will be mostly a cruiser and for right now I am just doing a budget build on this engine until I see how things go or if I decide go another route.
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Re: stock 400 build
[Re: OrangeProwler]
#835905
10/29/10 07:37 AM
10/29/10 07:37 AM
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Joined: Jan 2003
Posts: 75,324
A gulag near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,324
A gulag near you.
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Quote:
Quote:
if they are the originals,i don't think i would want to use the "stock" valve springs with either cam choice.
I don't understand why I couldn't? The motor is low mileage unit and it looks okay on the inside from what I can see. My 318 got the K6900 cam when it had around 170k miles and using the stock springs and still is going alright other than the usual high mileage issue.
My car will be mostly a cruiser and for right now I am just doing a budget build on this engine until I see how things go or if I decide go another route.
Oh you can use them if you want but they are not speced for that cam and will float very easily, they'll be great to break the cam in , but that's about it. If you want the best performance from the can you should use it with speced springs.
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Re: stock 400 build
[Re: patrick]
#835906
10/29/10 08:20 AM
10/29/10 08:20 AM
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Joined: Aug 2007
Posts: 1,819
Middle of A Field
OrangeProwler
top fuel
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top fuel
Joined: Aug 2007
Posts: 1,819
Middle of A Field
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Thanks guys. I hate pulling the heads off this engine as it was running. I figure I could replace the 2bbl cam with something with a little more lope and I want around at least 280 ponies at the crank. Any suggestions? A Comp 252H only nets me 264 ponies. My 318 is 225 net horsepower.
Last edited by magnumminded; 10/29/10 08:52 AM.
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Re: stock 400 build
[Re: OrangeProwler]
#835907
10/29/10 09:19 AM
10/29/10 09:19 AM
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Joined: Jan 2003
Posts: 8,949
Holly/MI
Dean_Kuzluzski
master
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master
Joined: Jan 2003
Posts: 8,949
Holly/MI
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You can change valve springs while the heads are still on the car. Mancini racing, and others, sell a tool that bolts onto the rockershaft pedestal. You could probably rent or borrow one too. The trouble is when adding more lift the "valve retainer-to-guide clearance" MUST be checked. Those cams, anything above .440 lift as far as I'm concerned, are in the range of such a said crash. I just tried that on a set oof 318 heads, the retainers crash at .465, the cam has .477/.507 lift, .050-.100 clearance is recommended. It's either take the heads to a machinist for a "little off the top" or buy a self-centering tool and do it myself.  The factory valvesprings are VERY weak and would be all done anywhere between 4500-5500 and due to destructive harmonics it breaks down from there very quickly. Which can get into a situation where the valves are still open when the pistons are at TDC (Read: another crash). It's the old "might as well situation", so do it right and do it once. A cam, valvesprings, pc seals, and headgaskets aren't that much.
Last edited by Dean_Kuzluzski; 10/29/10 09:21 AM.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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