Need some help.I have a 73 mustang coupe with a 302. Need to be able to pass emmissions. Want to build it up to run around 350 hp. Would it be better to build a 351C or keep the 302? Looking to get the most hp for the money and keep it street legal. Would like to use it for weekend drag racing. Have seen a lot of build kits to go either way. If anyone has some ideas let me know.

 

What are the limits for your emissions testing? Some places may not allow much more than stock, while others will pretty much let you do anything.

In CO, the limits are pretty loose, so my 302 was able to pass with some tinkering...997 with a limit of 1000.

 

How long you going to keep it?

Build it up anyway you want, pay for the waiver and worry about it in a few years when you have to test again

http://www.azdeq.gov/environ/air/vei/fail.html#waivers

FWIW you car only needs a sniff test at idle and at speed. If it is well tuned and in generally good working condition either a 301 or 351 making the power level you want should pass without issue. However, the extra cubes always make power 'easier' meaning less cam.

Standards (I wonder what a 'reconstructed' vehicle is):

http://www.azdeq.gov/environ/air/vei/download/dyna.pdf

 

I dont think the limits are very high, the 302 passed without the egr working and most of the other emmissions parts disconnected. Only concern was at what point while increasing cam and head size will the car not pass?

 

id move somewhere that dont test be alot easyer on you to make more power.

 

351 will give you more torque meaning you dont need as much power to get action...in a big car like a 73 its a no brainer to me.

What emissions do they actually test?

 

Your caris freakin beautiful!!!! Just though I'd pay a compliment where one was due!