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#1
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Well folks, it's quite apparent that 426 street wedge motors are NOT plentiful these days! So instead of wasting time waiting, let's consider the 413. Right now I have no less than 3 in different states of completeness on tap for the buying.
The biggest drawback of going with the 413 is that pistons are NOT readily available. Supposedly Diamond has some pop-up units to be used w/ the "906" 440 head, but they are ~ $725 a set. Not exactly what I had in mind for a set of street duty pistons. I couldn't find a web site for them, anybody got some connecting info to share? I've contacted Hughes and they have flat top cast units that Dave Hughes says would work fine for my 450 hp street motor w/ occasional drag use. The problem is, if I go with the "906" heads I have, I'll only end up with ~ 8.5 to 1 compression. Well, I don't plan on running a blower! The answer is, to mill the "906" heads .080" or so to get even close. I'm hoping the use of thin head gaskets will get my close to 10 to 1 I'm looking for. Then there is the question of using the stock small chambered 413 heads and re-working them for bigger valve sizes. What the heck, if I gotta go that far, why not go all the way w/ 2.19 intakes and 1.81. exhausts! I will guess that the stock 440 valve size would be adaquate for the smaller bore 413. I don't want to end up with ~ 12 to 1 compression either. So if any of you guys 'n gals got a heap of knowledge cooped up in your cranial cavity and you need to vent, let me have it, I'll listen! I'm still looking for that elusive '64 Plymouth Fury! Richard |
#2
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I had a 413 in my 64 300. I rebuilt it using Badger cast pistons and 906 heads, along with the steel shim gaskets. I made sure I had 10:1 compression and I ran the Street Hemi grind cam. ran 12.95 in the quarter. Of course I paid attention to the assembly, ran a windage tray and a ton of other upgrades spelled out in the MP engine book. So coaxing power out of a 413 isn't hard, having to go .060 over helped the compression issue. She'd ping on most super unleaded gas, I had good luck with Shell SU2000 and Diamond Shamrock in the summer, during the winter any super worked.
Steve |
#3
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If you put oversize valves in your cylinder heads and try to put them on a 413 block, you need to make sure the valves don't make contact with the cylinder block. Original Max Wedge motors had the cylinder blocks notched for (2.08/1.88) valve clearance.
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#4
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Richard its good to hear that someone out there wants more than 8.5:1,Heres my solution for 10:1 in a 413.Use Daves pistons(8.5)and use close chamber heads(915s if you can find them or 67 closed chamber of some sort even the small exh. valve version)these will raise comp about .4 of a point,Install 2.14/1.81 valves(backcut valves and have machine shop blend the bowls,use mp template for porting and port match intake and exh,and mill .060,this will raise comp another .9 or so and give you 9.8 or better.Make sure you run steel shim head gaskets(.018 compressed)as fel-pros are .040,Alot of this I imagine your already aware of,you mention milling .080,I have not been successful milling more than .060,I have run heads milled .090 but they eventually succumbed to minute water leaks.That should make an honest 450hp if cammed right(509 mp?)....PRO...
[This message has been edited by PRO (edited December 11, 1999).] |
#5
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Hello Guys! I have a complete set of 8 used 413 flat top cast pistons and conneting rods I removed from a 64 dodge about 13 years ago. I just took a look at one, and I can still see this number in the top: "L3059F" with ".030" just below it. I measured the diameter at 4.320" and an approximate distance of 1.925" from the center of the wrist pin to the top of the piston. Is anyone interested in these?
I was 18 at the time I pulled these out, and I found the reason why my cooling system was being pressurized: 1 horizontal hair-line crack, about 1" long, in both the number 6 and 8 cyl's. I didn't realize how valuable a 413 block was at the time, even with the 2 cyl. wall cracks I found, so I just through it away...What an A-hole! (But for some reason, I held onto these pistons and the forged crank.) Well, if anyone is interested, just let me know. |
#6
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4.320 is the bore from a 440,The bore on a 413 is 4.187 or there abouts.
I would use the 906 heads and mill them .06,go with the big valves ,check the clearence on them.Use a thin steel shim gasket.Don't forget you can deck the block some to make up for more space.Heck with a little luck ,I don't see why you couldn't locate some slugs for that.I know they are getting scarce,but if you do your home work ,you could have a custon set turned up. |
#7
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I have a set of stock bore 413 11:1 domed (small)pistons, if your interested. Forged pistons require more piston to cylinder wall clearance than cast pistons do, so you may have a 413 block in good enough shape to put these pistons in.
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#8
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Thanks to all you guys for your interest and responses. I've printed out the whole business in order to retain all the info you've shared here.
I look forward to hearing from the guys I e-mailed to, also. Richard |
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