APPLICATIONS
The hot camshaft is designed for all hydraulic roller camshaft small
block engines produced from 1986 to present including the Gen I, Gen IE, and
Gen II variety. This camshaft will not work with the latest small block Gen
III engines such as the LS1. Proper valve lash is maintained on LT4 engines
which are equipped with the production "net lash" non-adjustable rocker
arms. The camshaft includes a fuel pump lobe for those applications
requiring a mechanical fuel pump.
|
Hot Camshaft (P/N 24502586 Specifications |
|
|
Intake |
Exhaust |
|
Lobe Lift |
0.328” |
0.328” |
|
|
|
|
|
Valve Lift |
|
|
@ 1.5 ratio
@ 1.6 ratio |
0.492”
0.535” |
0.492”
0.525” |
|
|
|
|
|
Duration |
|
|
|
@0.006 cam lift |
272° |
281° |
|
@0.050 cam lift |
210° |
228° |
|
|
|
|
|
Lobe Centerline |
109° |
115° |
|
|
|
|
|
Lobe Separation |
112° |
Camshaft
Dowel Pin
The dowel pin length is configured for the “pin drive” cam driven
distributor used in some model year LT1 and all L99/LT4 applications. If the
camshaft being replaced has a shorter dowel pin, lightly tap the dowel pin
in so that it protrudes 0.310” from the front of the camshaft surface.
Roler Rocker Arms
The 1.6 ratio self-aligning roller rocker arms (P/N 12370839) included
in the HOT cam kit are to be installed per the instruction sheet contained
in the rocker arm box. |
LT4 Valve Springs
|
LT4 Valve Spring Specifications |
| Part
Number |
12551483 |
|
Material |
Chrome
Silicon SuperClean |
| Outside
Diameter |
1.337” |
| Inside
Diameter |
0.906” |
|
Installed Height |
1.780” |
| Seat
Load |
101
lbs. |
| Average
Spring Rate |
331
lbs./inch |
| Solid
Height |
1.215” |
Using
the supplied LT4 spring seat (P/N 10212809) and retainer (P/N 10212808) with
a late model aluminum head (350 HO, LT1, LT4) will provide the correct
1.780” installed spring height. Other small block cylinder heads may have to
be machined to accept the valve spring diameter or for proper valve seal to
retainer clearance.
Balancer Hub Removal
Kent-Moore tool J-39046 is required when removing or installing the
balancer hub from the crankshaft on 1992-97 L99/LT1/LT4 engines. The tool is
available from Sallee Chevrolet or directly from Kent-Moore at:
Kent-Moore Automotive Group
Spx Corporation
29784 Little Mack
Roseville, MI 48066-2298
1-800-345-2233/FAX 313-578-7375
Monday through Friday 8:00 a.m. to 8:00 p.m. EST |
Heavy
Duty Timin Chain Set
A heavy Duty timing chain set is mandatory for engine operation
above 5,500 RPM. A 1/2” roller timing chain, crank gear, cam gear, and
billet water pump gear are available under part number 12370838. The cam
gear in the above kit is configured for “pin drive” applications. Non- “pin
drive” applications will require updating the front cover, distributor, and
distributor vent harness to “pin drive” configureation components.
From SDPC
website |