Quote:
Originally Posted by phunt
Deck height is the distance from crank center line to top of block. For Porsche, center line of crank, case mating surface, to top of cylinder (head mating surface). Porsche case is 112.5 (112.4) from crank center line to top of cylinder spigot cylinder is 85.3 (85.4) total 197.8 That is deck height. To figure piston below (or above) deck simply measure. 3.0 crank is 70.4 take half of that 35.2 add that to rod length 127.8 then ad compression height of piston 34. That stack or length is 35.2+127.8+ 34 = 197 so if block hasn’t been machined and your running stock piston rods etc then there is built in a .8 below deck piston clearance. Which is what you want Measure your case and cylinders and compare to your rod length and compression height of the piston. Done. Now clay is a good idea for valve to piston clearance
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Thank you. I am all ears until I turn another wrench. Waynes book doesnt crawl deep into exactly where I place clay for my domed cis piston setup on my ‘82 SC. Everything is bone stock, except my heads were fly cut .14mm
Bill