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Old 10-30-2012, 08:12 AM   #1 (permalink)
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408W Stroker build

hey guys im new to the forum, and ford perfomance, this is what i have and want to do, any help would be appreciated.

i have a 75 351w that i would like to turn into a 408 Stroker. i was going to get the kit from CHP unless there are better ones, i already have an Edelbrock Performer intake,(came on the engine) but would like to switch, looking at the performer air gap my gaol hp is somewere between 450 and 550hp, and id like to keep the compression around 10.1, i want to be able to run mid grade or premium fuel, and i was looking at the kit with flat top pistons with valve reliefs to run the Twisted wedge heads, but im not sure those have the compression i want.. so im stuck on heads and cam. but i do know that i want a hydrolic roller cam. i want one that has a noticible idle everyone loves a cam that lopes! or atleast i do! but it stil needs to be streetable. and one last thing. with my combonation work with a built C6 Trans?
thanks guys
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Old 10-30-2012, 09:58 AM   #2 (permalink)
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Re: 408W Stroker build

Can you post a link to the parts you are talking about?..It's much easier for everyone that way so they don't have to go searching to help you out....When I was researching my 408 alot of the combo's listed did not have the correct compression ratio..You have to do the math and make sure the numbers are correct....Having said all of that I think your goals are pretty easily attainable..
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Old 10-30-2012, 11:18 AM   #3 (permalink)
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Re: 408W Stroker build

the math part is were i lack.. but here is the list of what im looking at..


Stroker kit

14840-SF-F408W - Ford 408W Flat Top -3.0cc Street Fighter Engine Kit

Heads

Trick Flow® Twisted Wedge® 170 Cylinder Heads for Small Block Ford TFS-51410004-M61 - SummitRacing.com

Intake

Edelbrock Performer RPM Air-Gap Intake Manifolds 7581 - SummitRacing.com
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Old 10-30-2012, 11:21 AM   #4 (permalink)
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Re: 408W Stroker build

also it will be bored 30 over
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Old 10-30-2012, 11:27 AM   #5 (permalink)
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Re: 408W Stroker build

sorry for the aditional post, i was re-reading the original, i would deffinetly be ok with 600 hp so i guess numbers would more be about 450-600. the link to the kit is rated for 600hp heres the one rated up to 800

14840-PS-F408W - Ford 408W Flat Top -3.0cc Pro Street Engine Kit

i can run the same twisted wedge heads with this kit as well.. thanks for all the help guys
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Old 10-30-2012, 11:54 AM   #6 (permalink)
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Re: 408W Stroker build

If those numbers are accurate at the bottom of the page those pistons have much more compression than you are looking for...Most heads for the smallblock are in the 58-64cc range and require a fair sized dish in the piston to run in the 10ish:1 range..Also the twisted wedge 170s are a little on the small side for a 408..The 190s would be a much better fit..
I would select the head you are going to run and then we can try and find a piston that will work..
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Last edited by frdnut; 10-30-2012 at 11:57 AM.
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Old 10-30-2012, 12:27 PM   #7 (permalink)
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Re: 408W Stroker build

so would i be better off witha different set of heads? not the twisted wedge? they do have a 54cc chamber as and option i believe. so what do you think i should go with?
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Old 10-30-2012, 12:28 PM   #8 (permalink)
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Re: 408W Stroker build

but if there alittle small for a 408 i should go with a different head right? what about edelbrock or something
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Old 10-30-2012, 02:34 PM   #9 (permalink)
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Re: 408W Stroker build

what about doing something like this?

kit
12357-SF-F408W - Ford 408W Flat Top -4.0cc Street Fighter Engine Kit
heads
Trick Flow® Twisted Wedge® Track Heat® 190 Cylinder Heads for Small Block Ford TFS-51400015 - SummitRacing.com
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Old 10-30-2012, 03:36 PM   #10 (permalink)
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Re: 408W Stroker build

Those are good heads for a 408, BUT that 64cc combustion chamber will give you too much compression with the stroker kit to meet your original goal. Check out the bottom of the link you provided for the crank kit and it will tell you the approximate compression ratio with a given CC head. You can see that the -4.0 kit will give too much compression with almost any head.

You should be looking for a dish or a reverse dome piston with around a 19-24cc dish.

Here are a couple of examples that are in your price range and they contains good parts for street/strip build:

http://www.coasthigh.com/Ford-408W-R...600-f408-1.htm

OR

http://www.coasthigh.com/Ford-408W-R...0-sf-f408w.htm

I would specify that you want a piston for use with the trick flow heads (I am sure that Probe has one) if that is the direction that you go with (which is what I would do.) Since CHP is owned by the same guy as Probe, it should not be a problem for them to give you the right piston.

The RPM Air Gap would be miles better than the base Edelbrock Perfomer manifold and that is what I would consider. If you need hood clearance or want a little more low end torque at the cost of a little HP, you could also consider a Performer RPM or a Stealth.

Although quite strong, a C6 wastes a lot of usable HP compared to a C4.

With the proper camshaft selection, this combo should meet your HP goals and not need more than mid grade fuel.
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Last edited by dennis111; 10-30-2012 at 04:48 PM.
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Old 10-30-2012, 04:38 PM   #11 (permalink)
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Re: 408W Stroker build

thanks man that is exactly what i want! just need to decide the cam
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Old 10-30-2012, 04:43 PM   #12 (permalink)
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Re: 408W Stroker build

one of my consers though is that it is only a cast steel crank. with that hold up or should i try and get a forged crank? oh and that made up my mind on the intake.. im getting the air gap. will order it next week
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Old 10-30-2012, 05:00 PM   #13 (permalink)
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Re: 408W Stroker build

I chose the above kits based upon the cost of the kit you mentioned. Of course you can pay more for better parts.

You really don't need a forged crank in a stock block and a good cast crank is fine for street with some strip use. I ran a cast Scat with 500hp at the track for many years with no issues or concerns. I suspect that the RPM crank would be just as strong. I would be more concerned about the rods in those kits than the cast cranks and would probably upgrade to an H beam rod (which is available in other kits from CHP.) With the Probe SRS pistons (a good choice) and proper assembly, you will be good at 500-600hp for many, many years.

Nothing wrong with using the H beams with a cast crank either. Not only are the H beams stronger in most cases, they typically come with capscrew instead of traditional bolts/nuts(which require additional block clearancing.)

By the way, CHP is a good source for parts. I also like dealing with CNC Motorsports. Be careful of many kits found on various sites as there are some parts that have poor quality and you will want no part of.

You can see all the 408 CHP kits with 22cc dish pistons here: http://www.coasthigh.com/Ford-408-Wi...e-s/130642.htm


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My little 65' Stang street car:



Dart 428W NA, 4 Spd, 4:33, on pump gas pushing 3550lbs.

10.494@128.76

Last edited by dennis111; 10-30-2012 at 05:32 PM.
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Old 10-31-2012, 05:00 AM   #14 (permalink)
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Re: 408W Stroker build

thanks for the help dennis. that answered a good question for me.. i am probably going to go with the pro street kit so i can get the H beam rods but then i get a forged crank as well.. unless i can swap rods in the prostreet kit, but i dont want my internals hitting there max hp rating. not a good idea.
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Old 10-31-2012, 05:09 AM   #15 (permalink)
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Re: 408W Stroker build

so with all that being said i should be able to run the twisted wedge 190 head Trick Flow® Twisted Wedge® Track Heat® 190 Cylinder Heads for Small Block Ford TFS-51400015 - SummitRacing.com

to get my compression closer to were i want it. trickflow doesnt have a 61cc head so that 190 would put my compression around 9.66 or 9.70 depending on the kit, which is slightly lower than i want, i done ever plan to make it a boosted engine.
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