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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 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? IP: Logged
Daniel Jones Gearhead Posts: 575 From: St. Louis, MO Registered: Aug 99	posted 03-01-2003 07:11 PM > 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 IP: Logged
Fstln69 Gearhead Posts: 355 From: Westmont,il Registered: Jan 2003	posted 03-01-2003 07:20 PM 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 12.94@103mph before M&M.. after?? always in search of more HP and faster ET'S Fstln69 Pics Page IP: Logged
Daniel Jones Gearhead Posts: 575 From: St. Louis, MO Registered: Aug 99	posted 03-01-2003 10:24 PM 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 IP: Logged
Mpcoluv Gearhead Posts: 1144 From: Charlotte NC usa Registered: Apr 2001	posted 03-02-2003 08:52 AM 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).] IP: Logged

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