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Old 02-08-2005, 08:02 PM   #7
EricS76
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Join Date: May 2004
Location: Llano,TX
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This from www.73-87.com


For 1978, all C10/15's with GVW's under 6,000 lbs have converters regardless of engine. All other '78 models (i.e. Big 10's/Heavy Halfs, K10's, C/K 20/25/30/35's)had GVW's over 6,000 lbs, and therefore did not use converters. EXCEPTION: For 1978, all California models with GVW's under 8,500 lbs had cats. Therefore, this California exception included ALL and ONLY 10/15/20/25 series vehicles, including Big 10's/Heavy Halfs.

For 1979, Federal laws, like California statutes in '78, raised the GVW threshold. So, all 1979 models, except for C/K 30/35 vehicles, had cats, nationwide.

For 1980 through 1986, the same models as those for '79 used cats. However, a new C6P heavy duty option was offered for C/K 20/25 models which provided an 8,600 lb suspension package. These new, heavier 3/4 tons cleared the 8,500 lb limit, and so did not use converters during this time period, nor did C/K 30/35's.
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‘66 Chevy C-10, long bed fleetside, 350, 3 on the tree, 4-7 drop.
'77 chevy C-10 Custom Deluxe, 350, SM465 4 speed, flatbed.
'80 jeep CJ-5.
‘14 Chevy 1500 Z71…
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