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Old 02-10-2005, 05:49 PM
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503 twin turbo idea.

Im thinking Im going to build a 409 stroker and now I have most of the pieces in place, tell me if you think it will work ok, or if i should go for a shorter stroke etc. 409 truck block (bored min to clean up) 4.25 in BBC 4340 stroker crank machined so snout is SBC dia, fly weighs machined to clear ( feathered edges taken down) stock lenght forged eagle H beam rods, I have to call or email Ross and ask if they can make a 8-8.5:1 piston for that stroke I have seen the 10-11:1 but I want to turbo this so that wont do, I plan on BBC steel splayed main caps, Heavily ported 333 casting truck heads( not my first choice but they might do) I have heard you cant put larger valves in 348,409 heads due to hitting the water jackets. Any one tried to put larger valves in these? it may just be a rumor I guess i could have it sonic checked to see what i have to work with. Even with stock size valves i think with enough boost i could fill my cyls. I think this block should be perfect for a turbo set up due to 6 head bolts per cyl, Any ways I dont know what cam I should go with theres not a whole lot of choices I have seen. I want something fairly radical but i want to be able to drive on the street, if this means a vac can then i guess that works, this will be a mostly drag engine, I plan on going with a small pickup truck, something light that i can do a lot of frame work on and tub easily, that and it should surprise the rice in town nicely. any way any holes in my idea, I probably left alot out if you have any Q's ask, I dont know if i should go with a shorter stroke to get quicker revs or if i should stay with the torque monster idea. I have herd of 500 hp out of 4 in stroke kits but am looking for more than that if i can get it. I am thinking of a custom Fuel injection set up and maybe stealing most of the parts off a 454 or similar engine and just doing a custom intake to incorporate the parts of the system i can use. Th400 with a stall, Ford 9 with 3.70-4.30 gears, Stainless custom headers, twin turbos similar to that of a Power stroke so around t44s. I have that written down at home just cant think of it now. Any ideas thanks.

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Old 02-10-2005, 06:14 PM
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If you have a good 409 block and heads,.....SELL THEM!!!!! I'm sure that someone will pay a chunk of change for them, then you can build a more traditional SBC or BBC combo! What if you spend all this dough on the 409 and blow it up???? All of the parts and headwork will be of no use to you unless you can find another 409 layin' around!
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Old 02-10-2005, 08:23 PM
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Dont build the engine for the twin turbo setup. You wont be able to afford it anytime soon lol.
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Old 02-10-2005, 08:36 PM
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You cant just build an engine and then stick some turbos on it later. You also dont want to run any ole lumpy cam you see. Matter of fact you want a mild cam with turbos.

That said, I would get a traditional small block if you are looking for turbos. I think you should build yourself a nice stout small block to get used to. When you get that under your belt you can look at turbos. Turbos are very doable, but you really have to do alot of homework.

Chris
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Old 02-10-2005, 10:01 PM
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I wasn't intending on him putting them on later. Id just hate to see him build an engine with the turbos in mind, and then realize how much money and time it would take to twin turbo it, and then be stuck with a NA engine not optimized for the street.
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Old 02-11-2005, 06:16 AM
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Wasnt directing that at you Siggy. I did not read past the first couple of post.

Chris
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Old 02-11-2005, 09:59 AM
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Ah gotcha.
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Old 02-11-2005, 06:49 PM
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Ok, I have built quite a few engines so far and yes one of them was a small block chevy and that was probably my best build. I haven't dynoed it yet but im hopeing to be in the 400 hp area when its all tuned up. 0010 casting block, Steel main caps, bored 30 over, speed pro forged pistons, childs and albert gap-less rings eagle forged i beam rods, comp cams 268 extreme energy cam and matching springs, comp pro magnum rocker arms 1.5:1 ratio, manley pro flo valves, dart pro one aluminum heads (200 cc runners) angle plugs,2.02 1.6 valves.stock type forged crank, double roller timing chain, rebuilt distributor with performance distributors race coil, 8.8 mm wires, air gap intake, speed demon 650 vac sec. carb, k&n x stream filter, engine should be around 9.7-10.2:1 compression. cranks at around 180 psi cold, like 10 deg winter cold,
Also have worked with pontiac 400, 455, chevy 348, 305, ford 460, 429, 351w, etc. I want to build a long project I have around 7000 in my SBC, I plan on putting that much if not twice that on this. I dont plan on slaping this together over night. it will take me a few years to get the a/r, boost pressure, etc figured out. Im in diesel right now at wyotech and they dont go into much depth on turbos I have been reading about them in a few super charging/turbocharging books i have and would rather use turbos than any super. I plan on starting out if I have to with 2 turbos off from diesels. maybe powerstroke since they run garret. I wouldnt mind some turbos of the 24 valve cummins I dont know how holset turbos stack up or if they would flow enough. I guess i could go with a single turbo set up so it would be cheaper and go with a brand new turbo right away. Either way I want to build a hot engine that is still unique. I know i have a lot of turbo home work, if nothing else i can always ask you turbos10 if i get lost you seem to know your stuff dang well, if thats not too much of an imposition. Im glad that you think that this would be a hard project i love to do what people tell me cant be done or is hard to do. Not much worth doing is easy.

Last edited by Jared; 02-11-2005 at 07:43 PM.
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