[67Lemons]

I know this is a silly subjective question but how strong was the 1972 400 in the GTO? Considering a good state of tune, no obvious mechanical issues etc.

I ask because the stock 400 in my 72 GTO can’t spin the tires from a dead stop and needs to be revved to about 3k before it will spin the tires. Basically stock as far as I know with 117k, I see evidence of a cam swap at some time but stock idle, compression is 140-150 across the board, timing optimized with a curve that comes in around 2800 and total at 34 degrees, proper tune on the factory Quadrajet with jetting and rods suggested by Cliff. Car has a factory M20 and 3:23 gears, it feels strong through the gears but wow it feels like a turd off the line.

I always heard that these stock 400’s were pretty strong with a lot of torque so I don’t know if it’s just me or this engine is tired or something else. Again, I know it’s a silly question but figured it will bring some discussion if nothing else.