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Old 09-21-2007, 10:52 PM
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Help With 406 Engine Build

I'm in the process of buying parts for a 406 engine build, Flat top pistons, 5.7 rods,air-gap intake, the trans will be 700r4, 3.73 gear. This will not be a daily driven vehicle, however I want to be able to enjoy this car on the street and take it to the track on occasion and be proud of the results. What I'm needing help w/ is the cam and head selection. I do want a cam with a nice lopey idle. However performance more important then lope. All input will be greatly appreciated.

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Old 09-21-2007, 11:12 PM
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Then i`m the guy you need to see, I just happen to have a set of vortec heads for sale, and I reside in Alabama one in the same. On the flip side there are alot of heads out there, and there`s a lot of cams, If you plan to run pump gas the flat top pistons are out or you`ll have to get bigger chamber heads. A 400 can take alot more cam than a 350 will, the 50 extra cubes swallows cams, a lopey idle cam in a 350 will idle smooth in a 400 so you can get pretty large before a 400 starts to lope. I would use this as the advantage, you could run a sizeable cam that still idled smooth and use it as the sleeper approach. a bigger cam will require a high stall converter, and the 700 trans will have to be beefed otherwise it`ll gut it rather quickly. Depending on what rear is in the car, it may have to be changed also, if it`s a typical 7.5 inch 10 bolt a 400 will gut it too, with C clip axles, they just aren`t safe. It also comes down to how much do you have to spend, and how fast do you wanna go?
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Old 09-21-2007, 11:24 PM
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Well actually I have a set of vortecs myself, trying to possibly upgrade saw 406 engine build-up in Super Chevy using votec heads liked it alot, possibly will model my build up after that. Now I do want to run pump gas, yeah I know the 700 will have to be upgraded and the rear end too. Currently looking for rear-end now....Looking at spending around $1,700 for the top end, I know that ain't that much, but I figure if I can't get what I want spending that then I don't need it.
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Old 09-22-2007, 09:33 AM
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I like that combo looks pretty good, now the problem would be the fact that the short block is already together, so there is no changing the pistons I was looking at those aluminum summit heads but I didn't know if they were worth anything, I haven't heard anything good or bad about them have you had any experience with them or know anyone who has, if so what do you/they think of them.
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Old 09-22-2007, 08:13 PM
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I really appreciate all the info you've offered me on this build. Now I did forget to mention that the block is "0" decked so I guess that would knock the Summit brand heads out the equation w/their 64cc, (or would the aluminum be forgiving enough on the cr that I could get away with it?) So more then likely it would be one of the dart heads, you gave the link to. (looking at Summit website now and their saying the aluminum head has been discontinued, and they only have one for sale)I'm looking for a head with the 72 cc and 215 intake runners you've recommended. Now I do have 2 questions, 1st, do all non after market vortec heads have 64 cc? 2nd, the size of the combustion chamber, I know can be decreased but can it be increased?

Last edited by Olds86; 09-22-2007 at 08:21 PM.
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Old 09-23-2007, 07:26 AM
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Make sure you get the rotating assembly balanced, a good friend of mine just built a 406 with 5.7rods and didn't-his engine has some bad vibrations and I'm surprised he hasn't lost the bearings in it already.

I also heard the Summit heads were made by Brodix.
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Old 09-23-2007, 08:56 AM
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Quote:
Originally Posted by Olds86
I really appreciate all the info you've offered me on this build. Now I did forget to mention that the block is "0" decked so I guess that would knock the Summit brand heads out the equation w/their 64cc, (or would the aluminum be forgiving enough on the cr that I could get away with it?) So more then likely it would be one of the dart heads, you gave the link to. (looking at Summit website now and their saying the aluminum head has been discontinued, and they only have one for sale)I'm looking for a head with the 72 cc and 215 intake runners you've recommended. Now I do have 2 questions, 1st, do all non after market vortec heads have 64 cc? 2nd, the size of the combustion chamber, I know can be decreased but can it be increased?
So, flat tops with 64cc is about 11.5 :1 right?

I actually wish I woudl have put those in my motor. If you used a hydraulic roller or solid roller with duration in the 250 or so range I think you might get away with pump gas, 91/93 octane though. That should lower the DCR enough to make it work, but I could run some calcs if you are interested at all. I've heard of it being done. With 0 deck, and a .035 or .040 head gasket, your quench will be right in the perfect area to fight detonation.

BUt with that kind of cam you will have a fire breather! I would think it "could" be streetable, but might be tough to live with over time. Big stall to make it work, 4000 or so maybe. It depends if you want something like that. WOudl have to be tuned very carefully.

All in all, sell the vortecs and get some Iron Eagles or something like F-BIRD said in the 72 or 76 cc range and they will produce more HP and TQ and get the comp ratio right without swapping pistons (which I would think woudl cost more money). You will be happy with the Eagles, I have a set on a 355 and they work very well.
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Old 09-23-2007, 01:09 PM
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Now I was actually thinking about going w/the 294 extreme energy comp cam which has a duration 250/256 @.050, until F-Bird gave me the specs on a nice 406 engine build using a 284 extreme energy cam. Giving just what I would be looking for as far as power is concerned. Now as I've said before the car will probably only be driven on the weekends and maybe once during the week, so its not going to be a daily driven vehicle so thats why I was hoping I could get a bit more extreme w/my components, but also like F-Bird said I'm not trying to be mixing gas everytime I get in the car either. So yea if you could do the calculations it would be greatly appreciated.
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Old 09-27-2007, 02:45 PM
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So do you think that was the "0" decked block and aluminum heads the "Summit Brand" my CR would be in that 10.3 range, please say yes because the more I look at those heads the more I want them, and I've spoken the machine shop in my area and I'll have to pay around $450 to change to screw in studs, bigger springs and a good reworking. Not to mention the specific intake and roller rocker arms I'll have to be that could only be used w/Vortec heads.
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Old 09-27-2007, 02:53 PM
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There is a good article in the latest Engine Builder magazine that has some good info on heads and breathing.

http://www.enginebuildermag.com/

The guys interviewed in the article are tops in the field. It's well worth reading.

tom
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Old 09-27-2007, 02:57 PM
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Thanx! For the link Tom I will definitely read through not only that one article, but all info on that website!
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Old 09-27-2007, 04:28 PM
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Okay...Okay...I see it ain't gonna work, but I just liked those heads you referred me to, but I see I can't use them "Dang". so what do you think about the Dart Iron Eagle Platinum w/215 intake runner and 72cc w/either the XE294 cam and VIC JR intake.
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Old 09-27-2007, 04:52 PM
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Well I was just weighing my options, I really do appreciate your info the engine will probably be built using the first set of specs you gave me anyway, but I wanted to get and learn as much as I possibly could. One last question does the price of a hydraulic roller cam outweigh the benefits or do you see a hydraulic doing the job just fine?
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Old 09-27-2007, 05:54 PM
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So what your saying is order a XE294 ground on a 107 LSA hyd tappet cam direct from Comp Cam and use 1.6 rockers instead of going hyd roller? and then just keep the Vortec set-up w/changed pistons, or use PN10621122 keep the pistons I got and use that special ordered hyd flat tappet cam? Like your already aware of I'm after a great strip/street motor that I can be more then proud of. Your right about selling the Vortecs there in really good condition, I get so caught up with buying stuff off e-bay that I forget I can sell stuff to.
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Old 09-27-2007, 06:27 PM
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Okay I really do appreciate all of this great info on this engine build, I do know that these are to separate combos and not to mix and match I like both builds, but I'm not sure which to go with, now I'm not going to set here and say money is no object because it is, but I also don't want to finally get it all together and wish I would have spent another couple of hundred dollars and done this or that differently either because don't nothing cost more then doing it again. So out of these two builds what do you think the characteristics of each would be? Which would you build?
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