While the 202 red motor (and to some extent the blue motors) were a little asthmatic, they were solid enough. They did not rev freely like the little 149 and 161's that were like little sewing machine motors but there were ways of liberating a lot of reliable fun from all of those (and the 186). I had a few motors in the straight 6 years but my favourite was a 202 bored 40 thou over and worked big time - from a new cast Yella Terra head made in Aus, to 3/4 inch Sig Erson roller rockers, stallite valve seats, phosphorus/bronze guides, larger (but not crazy large) valves, billeted Pro-cam from the US, full balance (even the harmonic balancer copped a balance), hand ported and polished at home, steel timing gear instead of the silly blue motor fibre, shot peened con rods and higher compression forged pistons, then even with the stock Strasbourg Vara-jet carb the thing absolutely went. And revved cleanly time and time again to 6,000 without valve bounce. I had a mate with a new 5 series BMW straight 6 and both motors were quite similar in character. Let us just say it nailed stock 253, 308 V8's as well as VL 3.0 Turbos (stock) with both a 4 speed M21 and the 3 speed auto that I had in there at various times and was a great highway cruiser. So I think with some work the Holden straight 6 (the 3.0 of course was Nissan) was a gem and mine used to put up decent miles even with the output so high.
As for Rover V8 - I think the 3500 was the best but the 3.9 distributor motor was close in terms of reliability but had a fair bit more grunt. The 4.6 of course can be made to work well in terms of reliability (and some went to 300,000 - 400,000 wihtout issue but most it seems not) as can the 4.0. My pick would be however a well re-conditioned 4.6 any day provided the block was sound, with the thicker webbing (which they usually were) and top hatted pistons and ARP head studs.
Cheers





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