Three is literally no chance a valve could actually do damage to the piston other than the small score/scratch marks you can see in that pick (no I am not talking about the valve clearance indentations) you can see the spots where the valve actually made contact. Re use them.
91VR4-3.0L-Stock heads and Cams-835AWHP 747AWTQ Daily Driver 10.31@142mph on street tires
SLTT-10.9 @ 142MPH Stock NA engine and NA heads/Cams
T4 AWD 9.21 @ 154.98 (Chris Hill Driver/Builder/Tuner Car Owned by 3SX)
T2 FWD 10.19 @ 140.31 (Chris Hill Driver/Builder/Tuner Car Owned by 3SX)
T4-159.23 MPH Ran on 6G72 3.1L! (Chris Hill Driver/Builder/Tuner Car Owned by 3SX)
T4-995AWHP Uncorrected 6G72 3.0L C16 (Chris Hill Driver/Builder/Tuner Car Owned by 3SX)
T2-820FWHP 3.1L 27psi C16 (Chris Hill Driver/Builder/Tuner Car Owned by 3SX)
Not knowing the mileage or prior condition of the engine (compression, leakdown, etc.) and assuming it was in reasonable condition you probably can get away with using the pistons. If you had the money, I would suggest a replacement short block. Some of the risks you are taking include a weakened piston, possible pinched top ring land on piston, and scuffed rod bearings. Since you are willing to take that risk. I suggest you get the heads repaired including new valves and valve stem seals. I would then get the top half of the motor together with the new timing belt and do a compression test before you complete the assembly. If you get some abnormal compressions you will have to start over. Good Luck.
So you don't think that the small score/scratch would make these "hot spots" like people have been saying. That is very reassuring for me, I really am tight on money, and I picked up rebuilt heads today. Thank you ALL for your input!
Originally posted by newfoundglory So you don't think that the small score/scratch would make these "hot spots" like people have been saying. That is very reassuring for me, I really am tight on money, and I picked up rebuilt heads today. Thank you ALL for your input!
what did you end up paying? i paid $528, but i needed 16 valves and a few valve springs...
They aren't actually "rebuilt". I shouldn't have said that. I paid 125 bucks! YIPEEE! for some good shaped ones off of a friend of mines 3000gt. I had a local engine shop check them out real good and they shaved a layer off of it like people have said to have done.
I needed 12 on the front head, not sure about the rear, I never got it checked out at a shop, but on the front head you can SEE the damages. I'm sure all 24 are bent. Hell, the car wouldn't even turn over by hand b/c the valves were so bent...
dude, if your not redoing the hole eng. just put the heads on and forget about it. i did a lot of broken belt jobs and never replaced pistons. no one ever came back. just replace the auto tensioner, idler pulleys, and w- pump. youll be fine.
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