Inliners International Forums General Discussion Engines GM 4 cylinders 151 153 181

Thanks Tom. I have an old Clifford catalog that lists cams for these. The 151 has one part number and the 153-181 have another. They all use the same timing set as our 6s. They share the same cam bearings and timing cover. Valve covers are the same for all heads. The bell housing pattern is called the metric or small corporate pattern.
Valve sizes are 1.5 &1.72 and in some 181 heads Mercruisers 1.6 & 2.0+. Some Volvo, OMC, & Mercruisers ane the 153s and 181s. !20 and 140 hp. The Iron Dukes seem to produce 90 to 110 hp. GM used the Duke in lots of Chevy, GMC, Buick, Olds, Pontiac applications. Jeep used them for a couple of years in CJs and DJs. Mine is going in a '26 Chevy roadster. After the MS of course. Maybe with the MS. They used a single BBL TBI on the Dukes and there is an unmolested '88 Chevy Citation at Pick&Pull. Beater