Going to be ordering the rebuild kit this Monday. Stock pistons were dished, so I should get dished pistons correct? Or should I get flat tops? Would I run in to piston/valve clearance problems with the 444232 cam with flat top pistons? That would probably bump my compression ratio too high for 87 of 89 anyways. Also any recommendations how to clean out the inside of the intake manifolds? I can just bead blast the outside but I don't know about the inside. Thanks guys.
Pretty much any replacement piston will have valve reliefs so P-V clearance won't be a problem until you're dealing with cams that produce total valve lift well over 1/2" and durations of around 280 deg seat to seat or more. A flattop piston with valve reliefs and 0 deck height will produce about 9.5:1 CR on this motor, stock pistons are usually about 0.100" down in the hole and have a small dish for 8.8-9:1 CR. My 5.8 ran on 87 octane no problem with this style piston...
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Paul O
1990 F150 4x4 XLT X-Cab 5.0, 3.55LS, Comp XE264HR-14, Flowtech LT's to 3" single, FRPP Mass Air Conversion, TweecerRT with BE, Innovate LC-1 wideband O2
Just put a $600 down payment at the machine shop. Work should be done later this week, 1100 total for boring and decking the block, recon the con rods and installing new pistons, valve job and mag-ing the heads and the block, cam bearings are getting installed, and the crank cut .10 under also. I also ordered a new flywheel, harmonic, and water pump at napa today. Might have to wait until pay day until I can order the cam, roller rockers and headers. Unless I can manage to sell this Nissan Sentra I have.
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