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Author Topic:   396 or 408
two89w
Gearhead

Posts: 230
From: sydney australia
Registered: Sep 2002

posted 03-01-2003 02:16 AM     Click Here to See the Profile for two89w   Click Here to Email two89w     Edit/Delete Message   Reply w/Quote
for a street/race 10.1 comp engine with manual trans would a 408 or 396 have better longevity? or would it be minimal between the two?

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Daniel Jones
Gearhead

Posts: 575
From: St. Louis, MO
Registered: Aug 99

posted 03-01-2003 07:11 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
> for a street/race 10.1 comp engine with manual trans would a 408 or 396
> have better longevity? or would it be minimal between the two?

408 = 4.030" bore by 4" stroke

Minimal difference between the two. A 351W has 9.5" deck block, a full
1.3" taller than a 302 so there's room to stroke. Assuming a zero deck,
with a 4" stroke and 6" rods, the stack height works out to be:

piston pin height = deck height - (rod length + crank stroke/2)
= 9.5 - (6.0 + 4.0/2)
= 1.5 inches

A lot of builders will go to a 6.2" rod:

= 9.5 - (6.2 + 4.0/2)
= 1.3 inches

or a 4.1" stroke and a 6.125" rod:
= 9.5 - (6.125 + 4.1/2)
= 1.325 inches

The typical 347 SBF strokers have pin heights in the 1.1" region, so
all of the above pin heights should be fine. You'll need good race-type
aftermarket heads to feed all those cubes. A friend recently built a
street 418W with a 4.1" stroke crank and ported AFR 205 heads. It peaked
at 556 HP at only 5700 RPM.

Dan Jones

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Fstln69
Gearhead

Posts: 355
From: Westmont,il
Registered: Jan 2003

posted 03-01-2003 07:20 PM     Click Here to See the Profile for Fstln69   Click Here to Email Fstln69     Edit/Delete Message   Reply w/Quote
Who makes a the best 408 stroker kit? Are the cranks forged in these kits?I know if i wanted a motor to spin hard a forged crank would be the best way to go.Being fairly new to the ford game i'm still learning what will hold up and what won't thanks to all you guys.

------------------
69 fairlane 351w [email protected] before M&M.. after??
always in search of more HP and faster ET'S

Fstln69 Pics Page

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Daniel Jones
Gearhead

Posts: 575
From: St. Louis, MO
Registered: Aug 99

posted 03-01-2003 10:24 PM     Click Here to See the Profile for Daniel Jones   Click Here to Email Daniel Jones     Edit/Delete Message   Reply w/Quote
The stroker kits are usually just pieced together from various aftermarket cranks and rods, along with custom stroker pistons (or off-the-shelf pistons where they exist). You can get the cranks in nodular iron (typically a 400-based crank), cast steel/iron, forged 5140 steel, and forged 4340 steel. There also billet cranks from places like L.A. Billet. Similarly, there are various aftermarket rods and pistons in hypereutectic and forged aluminum.

Dan Jones

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Mpcoluv
Gearhead

Posts: 1144
From: Charlotte NC usa
Registered: Apr 2001

posted 03-02-2003 08:52 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Fstln69:
Who makes a the best 408 stroker kit? Are the cranks forged in these kits?I know if i wanted a motor to spin hard a forged crank would be the best way to go.Being fairly new to the ford game i'm still learning what will hold up and what won't thanks to all you guys.


SCAT now makes full forged crank stroker kits.
Try their website WWW.SCATCRANKSHAFTS.COM
I would like to build a 418 myself.....

[This message has been edited by Mpcoluv (edited 03-02-2003).]

[This message has been edited by Mpcoluv (edited 03-02-2003).]

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