[84ta406]

The part number listed on the packing slip IS NOT the heads you posted a link to. Not all heads are the same. The 31400001 heads are the old Twisted Wedge heads, 23* and known for valve guide problems. The link you posted before was for their 18* head which has a minimum 2.100/ 1.6 valve, thats 3.700" of valve, plus the space between the seats. So we will say 3.800.. How does that fit in a 3.671 bore? Im not doubting you had some TFS heads but not the ones you posted. Your engine probably made a honest 350hp at the flywheel which is about 300 to the wheels, now that is logical as I have personally built a 305 with similar power and parts. Went low 12's in a S10 which is no where near enough power to go 175mph. Your car sounds like a very nice build but like John said none of that made sense. I dont want to sound cocky but I probably know more about Small Block Chevys and anyone on here so trust me when I tell you this stuff.