got block back from machine shop yesterday. first job was to test fit crank. math says this geometry engine should have about .020 deck height. wanted to check fitment of parts to verify. if it was much lower than that i would have considered using an eagle 94mm crank. as it turns out these parts give zero for deck height. so my quench zone will be gasket thickness. I can live with that.
I am going to try evo8 cams at first as this car needs to idle butter smooth at 650rpm. they have about 1mm more lift that dsm turbo cams. and they are hollow and about 2 lbs lighter. the head is from evo 3. been sitting on the shelf for about 8 years. was going to be spare for evo 1. turns out after thorough inspection the head is in really nice shape. guides are really tight. even guide seals seem good. still very pliable. started a mild street port. which includes blending seats into the bowls, and mild port on the exhaust divider. last will be a nice deshroud of the chambers. as the bores are now 1.5 mil larger than stock. head will be loaded with evo valvetrain. for those who dont know here are the weight comparisons. the evo beehive spring has about 52lbs seat pressure vs. 62lbs seat pressure for dsm spring. so at first one would think the evo 8 spring would float sooner. but the spring has to control motion of valve, spring, spring retainer, and the follower. all the evo 8 parts are lighter. less spring pressure also means less heat and friction. valves have better undercut/profled better so they flow better. exhaust valve is sodium filed so it runs cooler.
springs 55grams vs 40
retainer 12g vs 4
ext valve 54 vs 44
int valve 56 vs 54
roller 45 vs 41
so for the exhaust valves the 52lb evo spring has to control 129 grams. or 2.48 grams per pound.
for the dsm the 62lb spring has to control 166 grams or 2.67 grams mass for every pound of spring presser.
so really nice upgrade on the cheap..