I remember recently reading an answer in a tech
column for gasser v8's where the writer asked why aluminum heads
allowed higher compression, and the answer was that aluminum heads
demanded greater compression to compensate for the different heat pattern
(heat loss faster than a cast iron head).

I only have a 617 engine, and it certainly starts easy. Feel guilty not
waiting for the glow plug light to go out.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250