Help build a 408 Stroker!

[LowCountryEB]

I am ready to build a 408 Stroker. My EB is a weekend driver to the beach and around town. I drive it 50 miles a week tops. I want a stump jumper that comes out of the hole quick with tons of torque. I also want HP but Torque is most important. I am running an NP435 with 35's and 4:11's. I'd like to have 450-500+ Torque and HP. I want a drivable EB but want it nasty.

Here are some of the parts I am looking at. I need help with these and the remaining key parts selections.

Stroker Kit: Scat
Heads: AFR 205
Pistons: ???
Cam: ???
EFI or Carb?
Lifters: ???
Rods: ???
Crank: ???
Etc...

Where should I buy each of these parts?

I'd like to have my builder begin within the next two weeks. Your input is appreciated and helpful. Please be detailed with explanation if you don't mind. Thanks!

 

[buckintone]

Afr 185s, 205,s are for all out rpm. use as close to stocker cam as possible to keep it streetable, if u want higher rpm performance, go with a centrifugal supercharger, water injection, It starts coming on up around 3,500 rpms. Allows advance in timing, pump gas, good gas mileage, great street manners until u step on it hard, then....c ya!

Oh yeah, here's a pic of mine on the stand

 

[HoosierDaddy]

Personally , I currently have a raging hard on for the Trick Flow 185's that have been cnc'd on the intake/exhaust/combustion chamber. Something like $1800 at Summit.

Very similar flow to the 205's but the smaller 185cc intake runner , whooboy , talk about building some intake charge velocity!

http://www.summitracing.com/parts/TFS-51400004-C01/

65cc combustion chamber
.100 = 72i / 58e
.200 = 142i /112e
.300 = 216i / 150e
.400 = 258i / 192e
.500 = 287i / 220e
.600 = 301i / 231e

 

[buckintone]

Personally , I currently have a raging hard on for the Trick Flow 185's that have been cnc'd on the intake/exhaust/combustion chamber. Something like $1800 at Summit.

Very similar flow to the 205's but the smaller 185cc intake runner , whooboy , talk about building some intake charge velocity!

http://www.summitracing.com/parts/TFS-51400004-C01/

65cc combustion chamber
.100 = 72i / 58e
.200 = 142i /112e
.300 = 216i / 150e
.400 = 258i / 192e
.500 = 287i / 220e
.600 = 301i / 231e

Don't these require.special pistons.for valve clearance? Never tried em, but look pretty nice

 

[barronj]

If you're using AFR's, I think the 185 is a better head for the 408 in a bronco, unless you're going to build a $1000 set of headers.

The exhaust ports on the 205's are larger than any off the-shelf-header will accomodate. Sure, you can bolt up a set of 1 5/8" headers, but I feel like they're mismatched for the head.

I don't think the raised exhaust port on that head will really make a big different in how your headers hang/fit within the fram rails/bay, and I know other members have used that head.

 

[barronj]

Oh yeah, here's a pic of mine on the stand

That looks great

 

[LowCountryEB]

Thanks Barron. I am looking for a list of additional parts as well. Cam, lifters, rockers, etc....

 

[mlogan24]

Afr 185s, 205,s are for all out rpm. use as close to stocker cam as possible to keep it streetable

Uhhh, no. That sucker needs to breathe, and it needs to do it well. You are right, a 205 might be too much, but a 185? I don't think so. A stocker cam is just asking for disappointment. There are dozens of effecient, streetable, aftermarket cam profiles that will deliver tons of low end torque. That advice is solid for 1982, not 2012.

 

[HoosierDaddy]

I'd like to have 450-500+ Torque and HP. I want a drivable EB but want it nasty.
!

I'm not a pro-engine builder , but from what I have read recently (I've been looking at a 408 myself) 450ft/lb to 500ft/lb should be easily obtained with a 408 , especially the 450ft/lb .

I forget which race engine builder said it regarding street cars , but I've read it over and over and over, "Build for torque and the horsepower will follow."

A great thread by Bowsher , I hope it gets filled up the way he asks : http://classicbroncos.com/forums/showthread.php?t=196925&highlight=stroker+questions

 

[asinor]

"Build for torque and the horsepower will follow."
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Thats because horsepower is a calculated value based on measured torque

Torque * RPM / 5252 = Horsepower

 

[red hot71]

I think the first thing I would aquire would be a late model roller block. Factory roller camshafts technology is were its at,I mean a 4000rpm power band and 408ci.

Remember that trick flow's twisted wedge 195's are probley more like everybody elses 205's because as the name says there twisted and the intake ports are naturaly smaller. And piston choice is another area when trick flow heads are used.

Again I think roller cams are worth more than whos has the best head.

 

[LowCountryEB]

I have a 1994 351W roller motor sitting in my garage ready to go! I would assume I need a new crank but I'm not sure.

 

[buckintone]

Uhhh, no. That sucker needs to breathe, and it needs to do it well. You are right, a 205 might be too much, but a 185? I don't think so. A stocker cam is just asking for disappointment. There are dozens of effecient, streetable, aftermarket cam profiles that will deliver tons of low end torque. That advice is solid for 1982, not 2012.

Based on op, I said close to stock on cam, as to not have a wild idle and bad street manners, I also said to use a centrifuge shupercharger, which forces breathing, it is a best of both worlds option, and this is what the op was asking for. I rode in an old f150 with this setup, and it was sick! If u r looking for 7,000 rpms, then prob not for u

 

[KyleQ]

351W roller block
steel crank (forged is for RPM's - a stroker in a Bronco shouldn't really ever see anything ore than 6K)
stock rods
aluminum pistons
Trick Flow 185's
An aggressive cam with a lobe separation ~ 112 (I went with a 35-518-8)
Get some good headers

You can go either carb or EFI - I'm topping my motor off with GT-40 intakes (probably Trick Flow R next year as the GT-40's are limiting me to 400HP) and a Mustang ECU with at least 42lb injectors.

It might even look like this ;D

 

[HoosierDaddy]

From a TMOSS document :
"The 351 GT40 lower is a VERY nice piece – much less restriction in it than its little brother 5.0 liter version. In stock trim it flow tested right at 280cfm average. We needed 300+ cfm out of it for heads, so I ported the lower and we got 302cfm average with a delta from low to high runner of 9cfm. Flow testing was done with a nice clay radius at the top of the runner and the injector bung was plugged."

I'm not sure what the upper is capable of , he probably has it in another write up.

 

[barronj]

Thanks Barron. I am looking for a list of additional parts as well. Cam, lifters, rockers, etc....

Ford motorsports lifters

Summit rocker arms

Cam is your choice, but I would look at Competition Cams line of Extreme Energy cams.

You'll want to measure for pushrods, then order hardened ones. I bought a set of Trick Flows for $50 from Summit.

Order a 408 stroker kit, should cost around $1000-$1200, pick the cast crank.

 

[barronj]

- I'm topping my motor off with GT-40 intakes (probably Trick Flow R next year as the GT-40's are limiting me to 400HP) and a Mustang ECU with at least 42lb injectors.

Check out this article before you buy a new intake.

 

[Broncobowsher]

I started a stroker thread from those who have been running strokers. This might help.
http://classicbroncos.com/forums/showthread.php?t=196925

 

[KyleQ]

Check out this article before you buy a new intake.

I've read it - looking at it again it is hard to see myself loosing the GT-40, it seems to support 450HP as well... I'd rather keep it and just add spray when I want more power ;D