Posted by D Slater on January 28, 2009 at 05:06:36 from (72.65.137.103):
In Reply to: Increasing Horsepower posted by IHRedRules on January 27, 2009 at 19:02:52:
You wanted someone who knows what there talking about. At this point in my life I know just enough to know there's a lot I don't know, so I will just answer the part about heads and a little more. If comparing original 300 and 350 heads that were for same fuel type, there the same. Differences I know in original C169 and C175 engines as they progressed.C-169 used 3-9/16 bore. Early in production C169 had a dipstick added and petcocks in oil pan droped unless distillite or kerosene. C169 changed from a R1 carb. to R2, R2 continued on 350. Camshaft gear was changed from DA to DB. Connecting rods and pistons were changed to use a smaller piston pin. C-175 engines used 3-5/8 bore, by now most C169 have been changed to a C175. The pistons and sleeves will fit right in with correct piston pin size or adapter bushings in rod. Early in 350 production the intake exhaust manifold was changed a little from 300 type on gas tractors. During 350 production the camshaft was changed to use left hand threads and nut to hold cam gear on. Rest of cam stayed the same as 300 and early 350. There was other small changes that don't amount to much between the engines and as production progressed.
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