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Re: Difference between Wd45 powercrator and 175 pistons?

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Agco puller

05-20-2002 08:26:20

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WC-WD cams use a .250 lift X 1.488 rocker arm ratio so .25X1.88=.372 lift at valve - .012 lash
So the valve will come down a total of .360 inches.
D17's have a .260 lift but I have no specifications on the 45's lift. Also a good rule of thumb is .100 piston to valve clearance.
As for predictited HP with the Temco/Tisco's at 6.5:1 compression I calculate 46.5HP still less than the Standard bore D17 piston(@ 54hp) or 175
standard bore with your cam at about 60Hp. Compression ratio will build hp faster than your overbore at low compression ratio's.
As for the flat top yes you gain compression ratio but since the head is also flat which will kill good air turbulance and torque. Domes are a complete no no as this will reflect air away from the valves entirely. Small block chevy's with their small combustion chamber's in the head love flat top pistons, Big block chevy's with their large combustion chamber love domed piston to funnel air in and out.The W'series A-C must use a combustion chamber in the piston (crater, dish) to funnel air because the head is flat (no chamber)

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