Home

Products

Syclone 1178

_____________

Tech Articles

Engine

Transmission

Chipping

Electrical

Misc

_____________

Links

JS Mfg.

TurboTime

CanadianSyTy

ChitownSyTy

SyTyArchives

SyTyAuthority

SyTy.org

SyTy.net

_____________

Engine Specifications
General Data:
Type			V6
Displacement			4.3L (262 Cu. In.)
RPO			LB4
Bore			4.00
Stroke			3.48
Compreesion Ratio			8.35:1
Firing Order			1 - 6 - 5 - 4 - 3 - 2
Oil Pressure (Minimum)			6 psi@1000 RPM; 18 psi@2000 RPM; 24 psi@4000 RPM
Cylinder Bore:
Diameter			3.9995-4.0025
Out Of Round			0.001 (Max)
			0.002 (Max)
Taper	Production	Thrust Side	0.0005 (Max)
		Relief Side	0.001 (Max)
			0.001 (Max)
Piston:
Clearance	Production		0.0015 - 0.0030
	Service Limit		0.0027 (Max)
Piston Ring:
C o m p Groove Clearance Gap O i l Groove Clearance Gap Production Top 2nd Service Limit Production Top 2nd Service Limit Production Service Limit Production Service Limit			0.0012 - 0.0032
			Hi Limit Production + 0.001
			0.010 - 0.020 0.010 - 0.025
			Hi Limit Production + 0.001
			0.002 - 0.007
			Hi Limit Production + 0.001
			0.015 - 0.055
			Hi Production + 0.010
Piston Pin:
Diameter			0.9270 - 0.9273
Clearance In Piston		Production	0.0002 - 0.0007
		Service Limit	0.001 (Max)
Fit In Rod			0.0008 - 0.0016 Interference
Displacement:			4.3L
Crankshaft
Main Journal	Diameter	#1	2.4484 - 2.4493
		#2, #3	2.4481 - 2.4490
		#4	2.4479 - 2.4488
	Taper	Production	0.0002 (Max)
		Service Limit	0.001 (Max)
	Out Of Round	Production	0.0002 (Max)
		Service Limit	0.001 (Max)
Main Bearing Clearance	Production	#1	0.0008 - 0.0020
		#2, #3	0.0011 - 0.0023
		#4	0.0017 - 0.0032
	Service Limit	#1	0.0010 - 0.0015
		#2, #3	0.0010 - 0.0025
		#4	0.0025 - 0.0035
Crankshaft End Play			0.002 - 0.006
Crankpin	Diameter		2.2487 - 2.2497
	Taper	Production	0.0005
		Service Limit	0.001 (Max)
	Out Of Round	Production	0.0005
		Service Limit	0.001 (Max)
Rod Bearing Clearance	Production		0.0013 - 0.0035
	Service Limit		0.0030
Rod Side Clearance			0.006 - 0.014
Camshaft:
Lobe Lift ± 0.002		Intake	0.357
		Exhaust	0.390
Journal Diameter			1.8682 - 1.8692
Camshaft End Play			0.004 - 0.012
Valve System:
Lifter			Hydraulic
Rocker Arm Ratio			1.50:1
Valve Lash		Intake	One Turn Down From Zero Lash
		Exhaust
Face Angle (Intake & Exhaust)			45*
Seat Angle (Intake & Exhaust)			46*
Seat Runout (Intake & Exhaust)			0.002 (Max)
Seat Width		Intake	1/32 - 1/16
		Exhaust	1/16 - 3/32
Stem CLearance	Production	Intake	0.0010 - 0.0027
		Exhaust	0.0010 - 0.0027
	Service	Intake	Hi Limit Production + 0.001
		Exhaust	Hi Limit Production + 0.002
Valve Spring (Outer)	Free Length		2.03
	Pressure lbs. @ in.	Closed	76-84 lbs. @ 1.70-in.
		Open	194-206 lbs. @ 1.25-in.
	Installed Height ± 1/32		1 23/32
Valve Spring Damper	Free Length		1.86
	Approx. # of Coils		4

Matt H
Robert P
Les Y
Tony M
Jeff D
Nolan N
Jack O
Mark L
Hunter
John W

9.89@137 10.26@13
10.29@137 10.71@126
10.79@126
10.95@123
11.00@128
11.00@122
11.19@121
11.20@128

Sy
Sy
Sy
Sy
Sy
Ty
Sy
Sy
Ty
Ty

See our newest SyTy Vendor: TurboTime