[SuperHart]

You say that you have a 16" puller fan which should be adequate when installed on the size of radiator you have. Just because you have a 16" fan doesn't mean you can assume it's adequate. You need to know the airflow rating of the fan you have. If it came with the car kit, chances are it is a lower performing fan and you might be smart to choose a SPAL replacement (#2082) which flows 2400 cfm and mounts directly to the rear of the radiator. I know that SPAL offers 16" puller fans in several different air flows, 1300 cfm up to 2400 and 3000 cfm (race only) models. Another thing is, how many rows of tubes does your radiator have? In my opinion, you should have 4 rows for a big block motor. If your radiator only has two rows of tubes (standard kit car issue intended for small block applications) you might have to end up recoring the radiator with a 4 row insert or simply replace with a 4 row radiator of similar dimensions in order to cool your beast.

Another issue is these underdrive pulley sets that some guys like to use. They are intended for race applications and actually underperform on the street.

Also check your distributor advance. One of the benefits of vacuum advance is a cooler running motor but too much advance does cause overheating.

Of course, I can't compare your 460 to my 351W stroker (392 cid) but I have a 4 row radiator (1968 Mustang 428FE size) in my Cobra with the twin 10" decorative fans up front and a SPAL 2400 cfm 16" puller fan and I run only 195* in traffic on a 90+* day, promptly cooling back to 185* when moving. On a day in the mid 80s I never see above 190* even in traffic. I run 10* initial advance with another 16* vacuum advance at idle and a 180* thermostat.

In summary, check all the following:
1. distributor timing (do you have vacuum advance?)
2. Number of rows of tubes in the radiator (2=bad, 3=marginal, 4=adequate)
3. CFM rating of your 16" puller fan (2400 cfm needed for big block)
4. Is the radiator "burped"?
5. Air/fuel mix ratio
6. Fuel Octane Rating vs. compression ratio
7. Pulleys (crank and water pump pulleys should be approx. same diameter)

Always remember that when choosing parts for your build that aftermarket parts designated "for race only" should be a clue that they may not perform as desired on street applications. When the factories designed their vehicles, they pretty much figured out what would work and what wouldn't on the street and chose parts to minimize complaints and problems (warranty headaches). So, choose wisely!!!