I would for sure try and run the L31 roller cam, lifters, pushrods in the 95 block. I would avoid the 95 camshaft in the 98 truck. L31 cam specs at 192º/197º .412"/.428" lift on a 111ºLSA
LO5 for under 7200 lbs GVRW(87-95 trucks engine "K", p/n 12520270)
9.25:1 compression, nodular iron crank, PM rods, dished hyper pistons,
CYLINDER HEAD SPECS:
-CASTING NUMBER 14102193
-SWIRL PORT INTAKE PORT DESIGN
-64cc COMBUSTION CHAMBER
-1.94" INTAKE 1.50" EXHAUST VALVE
-VALVE SPRING PART NUMBER IS 3911068 (SAME SPRING USED WITH THE OLD 300H.P 350 CRATE)
-INSTALLED HEIGHT 1.70" PRESSURE @ INSTALLED HEIGHT IS 80 LBS * PRESSURE WITH VALVE OPEN IS 267 LBS.
-THESE SPRINGS ARE GOOD FOR .550" LIFT BUT CLEARENCE BETWEEN GUIDE AND RETAINER MUST BE DOUBLE CHECKED BEFORE ATTEMPTING.
-7 BOLT EXHAUST FLANGE
-CENTERBOLT VALVE COVER FLANGE
-1987-1995 INTAKE MANIFOLD BOLT PATTERN WITH CENTER INTAKE BOLTS CANTED @ 72 ANGLE
THIS CYLINDER HEAD IS NOT A PERFORMANCE ORIENTED CYLINDER HEAD. IT IS CLASSIFIED AS A HIGH SWIRL HEAD THAT WAS INTENDED FOR GOOD BOTTOM END TORQUE AND FUEL ECONOMY. THE INTAKE RUNNER IS RESTRICTIVE BECCAUSE IT HAS A RAMP CAST INTO THE BOTTOM OF THE BOWL TO PROMOTE HIGH SWIRL.
LO5 for 8600+ lbs GVRW (87-95 engine code "K", p/n 12568758) also used in the 1996-2002 "P" Van 3/4 and 1 ton applications.
8.75:1 compression, nodular iron crank, PM rods, dished hypereutectic pistons
CYLINDER HEAD SPECS:
-CASTING NUMBER 14102191
-SWIRL PORT INTAKE PORT DESIGN
-76cc COMBUSTION CHAMBER
-1.94" INTAKE 1.50" EXHAUST VALVE
-VALVE SPRING PART NUMBER IS 3911068 (SAME SPRING USED WITH THE OLD 300H.P 350 CRATE)
-INSTALLED HEIGHT 1.70" PRESSURE @ INSTALLED HEIGHT IS 80 LBS * PRESSURE WITH VALVE OPEN IS 267 LBS.
-THESE SPRINGS ARE GOOD FOR .550" LIFT BUT CLEARENCE BETWEEN GUIDE AND RETAINER MUST BE DOUBLE CHECKED BEFORE ATTEMPTING.
-7 BOLT EXHAUST FLANGE
-CENTERBOLT VALVE COVER FLANGE
-1987-1995 INTAKE MANIFOLD BOLT PATTERN WITH CENTER INTAKE BOLTS CANTED @ 72 ANGLE
Flat tappet cam specs for BOTH LO5 applications:
165.9º/174.8º duration @ 0.050" lift .382"/.402" 111.9ºLSA
INTAKE VALVE OPENS @ -30.2 BTDC * INTAKE VALVE CLOSES @ 16.1ATDC * INTAKE LOBE CENTERLINE - 111.8
EXHAUST VALVE OPENS @ 18.1BBDC * EXHAUST VALVE CLOSES @ -23.3 ATDC * EXHAUST LOBE CENTERLINE - 111.8
So pretty much take the 95 block, tap the 3 bosses to make it OEM roller cam/lifter ready
-instal the L31 4x reluctor wheel onto the 95 LO5's crank
-install 1996-2002 plastic front timing cover over the L31 timing chain/sprockets-install crank position sensor into the Vortec plastic front timing cover
-install Vortec heads onto LO5 block
-install Vortec intake manifold torque to 11 lb/ft on the intake bolts
-drop in Vortec distributer
I think thats most of the Vortec specific stuff, once theengine is buttoned up, set the Camshaft Position Sensor retard (CMP Retard) to ZEROº plus or minus 2º by clocking the distributer with a scan tool that reads CMP Retard.
You MAY need to do a CrankShaft Angle Sensor Error Relearn(CASE or crank Relearn), and if the PCM tune is setup properly (if you decide on non-stock cam) the truck should start up and run just fine.
I do agree with Hitman, since the cam will allready be out, I would look into getting a different roller cam.
For GM cams there is the
10185071-ZZ4 cam 208º/221º .474"/.510" 112ºLSA Its used in the 355hp ZZ4 crate engines
12551142-LT4 Production cam 203º/210º .476"/.480" (with 1.6:1 rockers)
on a 115º This was used in the 1996 LT4 Corvettes and the rare 1997 LT4 Camaro and Firehawk cars. The LT4 was rated at 330hp at 5800rpm and 340 lb/ft torque and has a fuel shuttoff of 6412rpm. the LT4 has LS1 power in the older GEn 2 engine configuration.
14097395-Ramjet 350/HT383/marine roller cam 196º/206º duration at 0.050"
.431"/.451" lift on a 109ºLSA This would be a small step up from the stock Vortec 350/305-B-Body Iron head LT1 5.7-1994-96 4.3L V8 L99 camshaft.
24502586-LT4 Hotcam 218º/228º 0.525"/.525" 112ºLSA Used in LT1/4 Vettes as part of SCCA showroom stock class racing.
These are just the more common GM roller cams that get swapped into Vortec 305/350 engines.
then there are the 3 GMPP cams that are ground by and use Crane(IIRC) profiles.
12370845- 214º/224º .488"/.509" 112º LSA
12370846- 222º/230º .509"/.528" 112º LSA
12370847- 234º/242º .539"/.558" 112º LSA
I like the Lingenfelter roller cam P/N L210025087 specs of 213º/219º .493"/.502" on a 112º LSA.
When looking for cams, cams that fit LT1 enines also will work in the Vortec engines, and in your 95 LO5 engine with Vortec heads. Just look for cams that fit GEN1, GEN1E or GEN 2 engines.
peace
Hog