heres you basic factory built 383sbc performance engine
12498772 - GM Performance ZZ383, 383cid/425hp Performance Crate Engine
Detailed Description
The all new ZZ383 offers Big Block performance with a Small Block price tag. GMPP starts with the legendary Fast Burn cylinder heads and 383cid, to offer an incredible 460 ft. lbs. of torque @ 4500 rpm with a smooth, linier delivery.
The combination of a 3.800 steel crank and a stout .509/.528 lift hydraulic roller camshaft produces 425hp @ 5400 rpm, making the ZZ383 the benchmark by which all other 383cid small blocks will be measured. GMs testing was completed using a GM single-plane intake manifold, a 750cfm Demon mechanical secondary carb, and 1-3/4 primary x 33 length headers with a 4 collector. A dual-plane intake manifold can be used, but will affect overall peak performance numbers by 15-20 HP.
TECH SPECS: *Horsepower: 425 @ 5400 *Torque: 460 @ 4500 *Max. Recommended RPM: 6000 *Compression Ratio: 9.6:1 *Crankshaft: Forged Steel *Connecting Rods: 10108688 PM Rods. *Camshaft 12370846 (hydraulic roller): -Gross Lift (.509 I / .528 E.) -Duration @ .050 (222 I / 230 E). *Cylinder Heads: 12464298 aluminum 62cc. combustion chambers. *Rockers: 1.5:1 Roller Rocker *Four bolt main block *Powdered Metal Connecting Rods *8 Balancer *GM aluminum single-plane intake manifold.
http://paceperformance.com/index.asp?Pa ... odID=73193
keep in mind that the quick formula, for finding displacement on a V8 is.... bore x bore x stroke x 8 x .7854= displacement
the 3.80" stroke cranks were designed to allow you to build a (383) displacement SBC without boring the block .030 oversize, it was based mostly on the concept of allowing the factory 4.00" bore blocks to be used with the longer stroke and cash in on the popularity of the 383 sbc, without the need to cut the main journals on a 400 crank or use of the 400sbc shorter rods. this allows the factory to build a 383 with the standard 350 blocks and connecting rods and only special pistons are required
standard bore pistons or pistons designed for the more common 3.75" stroke cranks can be used if you get the piston matching your blocks bore size because most factory blocks that have not been decked measure about 9.023" tall
naturally you need to measure clearances but the extra .005 in stroke is basically meaningless as it means the standard 383 piston will ride .0025 higher up the bore wall, and most pistons don,t reach zero deck height
http://www.kb-silvolite.com/test/kb_car ... RodLen=5.7
read thru these links and sub-links
viewtopic.php?f=44&t=38
http://garage.grumpysperformance.com/index.php?threads/383-build-for-a-friend.14273/
viewtopic.php?f=53&t=726
viewtopic.php?f=51&t=125
viewtopic.php?f=69&t=2145