The CARRILLO connecting rod is a precision, high strength, quality connecting rod, which when properly installed and maintained, will perform flawlessly in today’s racing and high performance internal combustion engines. We would like to offer some suggestions and specifications that should be helpful in your installation.

BOLTS
All bolts should be lubricated under the heads as well as on the threads. We recommend the bolt lube included, or as an alternative, molybdenum base paste mixed with engine oil.

The preferred method to torque the bolt is by using the stretch figure listed in the table below. In order to check bolt stretch, simply fixture one rod, leaving the cap portion free from clamping load. Measure both bolt lengths loose, then progressively tighten the bolt until the measured increase in length correlates with the figures below. Use the indicated torque reading to tighten all the connecting rods in final assembly.

 

 

THREAD	TYPE	HEAD MARKING	STRETCH RECOMMENDED ENGLISH	STRETCH RECOMMENDED METRIC	TORQUE NOT TO EXCEED ENGLISH	TORQUE NOT TO EXCEED METRIC
1/4	CARR	S4	.0040 to .0060 in	.102 to .152	275 inlb	31 Nm
5/16	WMC	H5	.0040 to .0060 in	.102 to .152	38 ftlb	52 Nm
5/16	CARR	S5	.0050 to .0070 in	.127 to .178	45 ftlb	61 Nm
3/8	WMC	H6	.0050 to .0070 in	.127 to .178	45 ftlb	61 Nm
3/8	CARR	S6	.0050 to .0070 in	.127 to .178	65 ftlb	88 Nm
7/16	WMC	H7	.0050 to .0070 in	.127 to .178	75 ftlb	102 Nm
7/16-1	WMC	H71	.0050 to .0070 in	.127 to .178	75 ftlb	102 Nm
7/16	CARR	S7	.0050 to .0080 in	.127 to .203	100 ftlb	136 Nm
M8	WMC	HM8	.0040 to .0055 in	.102 to .140	42 ftlb	57 Nm
M8-1	CARR	SM81	.0040 to .0055 in	.102 to .140	42 ftlb	57 Nm
M8	CARR	SM8	.0045 to .0060 in	.114 to .152	48 ftlb	65 Nm
M9	WMC	HM8	.0045 to .0060 in	.114 to .152	60 ftlb	81 Nm
M9	CARR	SM9	.0045 to .0060 in	.114 to .152	60 ftlb	81 Nm

Bolt Instructions