Better heads

MOPEkidD-3 said
I dunno.... Aren't those still a bit big for a street 318? I think to really get the most potential out of those heads you'd have to do a bottom-end rebuild with flat-top zero-deck pistons for compression/quench and beefy enough rods, etc. to handle 6500+ RPM.

Why do you think that? They have essentially the same combustion chamber design and size as stock 302 heads (Heart shaped chamber, 62 cc's) The ports are larger but they still have real good velocity from the flow measurements I've seen. Also as far as the port size of the 340/360 heads killing all the low end torque on a 318 that's a bunch of bunk IMO. About 20 yrs. ago before I knew the 340/360 chambers were bigger than the 318's and would lower the compression me and a buddy of mine put my 74 360 heads (stock but rebuilt) on his 78 318 and it ran fantastic especially considering the compression was probably only about 8 to 1 at most. It had 3.21 gears and with everything except the heads absolutely bone stock it broke into the 15's. Sorry I can't give an exact time, just been too long to remember but I do know it was in the 15's which isn't bad for such a small engine in a full size truck. It did have a 72 340 intake with a thermoquad on it also but the jetting was stock. The 340/360 heads do loose some bottom end but from my experience with them it wasn't a huge amount like allot of people say. JMHO