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-   -   How to stroke a 360??? (http://www.moparchat.com/forums/showthread.php?t=31810)

Dean318 07-26-2001 03:55 AM

How to stroke a 360???
 
1 Attachment(s)
G'day everyone.
I want to find out the best way to increase capacity/stroke on a 360.
I'm currently running a 300hp 318 in a 69 Valiant Regal Sedan (same as a Dart, but a sedan) with all of the good peripherals, (ignition, M/P M1 manifold ect). I want to stick to a small block so of course I can still use all of my other
hardware, but I want big block cubes. Is this a popular exercise in the U.S.,
cause it's not here in Australia. And what rods, pistons ect are most commonly used. Also, what HP and torque figures are acheivable while
maintaining daily driveability.
This website is a Godsend to someone who is living in Ford and Chevy land.
Any thoughts would be great!

rumblefish360 07-26-2001 09:07 AM

The practice of stroking a small block (Or big block for that matter) is gaining popularity here in the states. The only supplyer I know off right noe that has stroker cranks for sale is MoPar performance. Keith Black (I believe) supplys the pistons for MoPar. If the price of a new crank is to much, then you will need a shop that can off set the cranks throw.
Stock rods can handle alot of power. There forged. And come with every engine. :D MoPar offers different length rods for a bit of custom work if needed.
Driveabilty depends on your taste. My current 360 is over 400hp. Its easy to drive. With a stroker, you can get much more torque and a HP peak sooner than a standard stroke engine. The real question is how much power do you want? Or how fast do you want to go?
Check out www.hughesengines.com for stroker info.
Heres a list of what Mopar has to offer. If theres a dealer in town, try to get a club disscount. Even if its a club of one. Tell'em your tired of being beat by brand "X" :D

MoPar performance stroker cranks;

HD Cast, 4.00 stroke p5007258
Forged 4340, 4.00 stroke, p5007254
Billet, 3.79 stroke, 8bolt flange, p4452979 (Lots of money)

Forged Piston & rings for the 4.00 stroke crank.
p5007412 (4.00) @ 12.0-1
p5007413 (4.030) @12.0-1
p5007414 (4.060) @ 12.0-1

Forged pistons & rings for the 3.79 crank.
p4876980 , 4.00 bore @ 10.5-1
p4876981 , 4.030 bore @ 10.5-1
p4876982 , 4.060 bore @ 10.5-1

DartMan360 07-26-2001 10:15 AM

What all has to be done to the block to accept the 4in stroker crank? Also if we use this in a .30 over 340 what kind of CI are we looking at? Everytime I see something about stroking a motor it confuses with what I have learned last time.

MOPARMANJAMES 07-26-2001 10:37 AM

FYI
 
Right now there are several suppliers of pistons but the most affordable is Kieth Black/Silvolite. I just put in a product request with them for some flat top claimer pistons using the 360 block and the 4" crank. My friend buys their chevy 400 claimers for $149 a set from Scoggins Dickey.
If they make these new chrysler stroker claimer pistons, they will be extremely affordable so call those guys up or E-mail them with requests and let's get some nice hypereutectic pistons at bargain prices!

Dean318 07-26-2001 06:32 PM

Thanks for that rumblefish360,
Having the crank offet might be the way to go given that Mopar stuff
down here is really expensive and hard to get.
(ie M1 dual plane man = $600.00 plus) Your right in guessing that I want more power without having to ring the suckers neck every time.
What capacity is the result?

408stroker 07-26-2001 07:18 PM

Hi. with a 4" stroke mopar crank in a .030 overbored 360 it will produce 408cid. It takes some grinding but nothing major. As for rods you can use reconditioned factory rods with the small end narrowed to 1". hope this info helps some.

Dean318 07-26-2001 08:15 PM

Thanks also 408stroker,
This is obviously the method you have used, are you happy with the
resulting power, drivability ect?
Also, can the 904 T/Flight go behind the 360?

DartMan360 07-26-2001 11:31 PM

A 904 will bolt up to any small block.

Ok I looked at the kit that Hughes sells for 340. I tryed calling them but they are on vacation. So next best thing is you guys here. The 416ci storker kit in a .30 over 340. Stage 3 Edelbrock heads, 571/576 lift at 1.60, RPM air gap manifold, and 1.60 roller rocks. What kind of power would we be looking at? Im going to call Hughes Monday morning and talk to them. Hopefully we can sell the convertable and get the hardtop into the 10's. What you guys change if anything with this setup?

rumblefish360 07-27-2001 12:25 AM

Dartman360;

Dartman360, Dean318
Make sure the 904 is up to the task. Some of them in stock form can not handle a stock 360. Make sure its built right. As far as power goes on the stroker, I can run a desk top dyno 200 sim. I'll need compresion, carb size, header size and cam timing events.
If you can supply cfm ratings for the head flow, it would be a great improvement on the comp. simulation.

Dean318;

More stroke = more power. Thats a general answer to a general question. Give specs for a dyno 200 sim. Read above.


MOPARMANJAMES;

Once again you come up with something really good. Great work/lookin out. Pistons can be the bane for us MoPar fans. (Along with a few other things)
Can you give the web site proper?

408stroker;

Narrowing the small end to 1 inch is for chevy pistons?

DartMan360 07-27-2001 12:40 AM

Im still not real good at figuring out the cfm readings. But I have enclosed the link to the page about the heads. If you go all the way at the bottom to the Stage 3 porting that is the porting we would choose. Click the Flow specs link and it will give you a graph. Again sorry for you having to do this. But im still learning when it comes to building motors. I have most of the basic things down. Im only 16 and have only learned from being out in the garage and at the track. Also I read as much as I can about these things.

The CR we would be using is 12.4-1 with 60cc head. But the Edelbrocks are around 67. So that would drop the CR rite? Carb will probly around 850 or 900. Header size is 1 5/8 with 3in collector.

Is desktop dyno as arcuate as they say? I have heard different stories about this program. Maybe that will be the next thing I will pick up. If you need any more info let me know. Thanks for the help. I have learned alot so far in the past month that I have been a member of the group.
here is the link

rumblefish360 07-27-2001 01:02 AM

The desk top dynos are only so good. But there preety good for being what they are. There better as a learning tool. The info you gather from them should not be taken as writin in stone.
What cam are you runing. Hughes? I should have know that the stage III porting was a Hughes deal.

DartMan360 07-27-2001 01:05 AM

The cam i was looking at was a Hughes cam. Is this bad or good?

rumblefish360 07-27-2001 01:16 AM

There cams look great. People here that have used them seem to love them.

DartMan360 07-27-2001 01:19 AM

Ok. All we are really looking for is a cheap way to get into the 10's. And this 340 stroker should get us deep into the 11's. I see your set up. Have you ran this? If so what have u got out of it and what kind of car. We were only looking for spend around 4 grand but this stroker kit will cost us somewhere around 5 when all done.

Dart 07-27-2001 11:01 AM

Hey DartMan:

5k for your build up? You are talking 340, but I have seen the 360 kits (4" crank, rods, and pistons) for $1000. The edelbrock heads are $1299 plus the head bolts ($50). With block work, intake, carb and valvetrain you wouldn't be anywhere near 5k. Granted the heads you are taking about are ported and more expensive, but where is the rest of the dough going?

DartMan360 07-27-2001 01:37 PM

You can get cheaper kits. But all of those are somewhere around 9 or 10-1. If we do this we would go with the 12.4-1. Its 2000for the race kit. another 2000 for the heads. cam-150 intake 220. rockers 350. So thats somewhere around 4700. RumbleFish ran this set-up on desktop dyno and with a switch to a single plane intake it said it should make real close to 600hp. That would gets us into the 10's for sure. But your rite you can get cheaper kits but we want to stick witht this kit from Hughes. I know Maninci also has them. I know they want 500 for just the pistons. And amost 400 for the crank. Then you gota buy the rods and everything else. So still by the time your done your going to be somewhere close to 2000. And still nothing close to 12.4-1. Also if you just stick a set of the Edelbrocks on it can hurt you more than it can help you. Hughes did a test to see what they flow. And no 2 ports flowed the same. It was between 200 and 250 cfm like they say but it wasnt the same on any 2 ports. So now they do not sell these heads without them cleaning them up. So you can get a basic set of heads with just them cleaning them up for 1700. So why not pay more and have a fully ported head for only 400 bucks more.

Thanks again Rumblefish for running that. I will let you all know what we decide on what to do or build. We are looking for the cheapest way into the 10's.

MOPARMANJAMES 07-27-2001 08:14 PM

Stroker Pistons
 
Rumblfish360, The Kieth Black website address is kb-silvolite.com.
I have found it to be one of the best sites as far as info goes.
I should here back from them in a bit but contact them and let them know there is a high demand for those! Thanks.

curious 07-27-2001 08:40 PM

i ve been tossing the idea of a 408 twin turbo. what do you guys think? need to find a set of heads with a lotta chamber because other wise my compression will be too high-9.5 :1. would a stroked turboed 360 run good?

rumblefish360 07-27-2001 11:13 PM

M&MJAMES:

Thanks dude.

curious;

Sure, why not. Use a set of "J" heads with 72+cc's with a thicker felpro gasket. I used one with a thickness of .054. A fly cut of the pistons will help lower the compresion.

Lasalles 07-31-2001 09:37 PM

Gday Dean318 i just found ur topic and im glad i did as the same thought has been running through my head.I have a 360 block in the shed and was interested in picking up one the the stroker cranks aswell for my CL sedan.
I would imagine a 727 would be much more healthy behind a 400 cube engine.Sounds like u could be burning down the 1/4 in melb while i do the same at Eastern Creek in sydney.
If u like send me an email with what uve decided to do as im still in the early stages of the idea.
steven@oz2000.com
Cheers


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