Had to replace the original cam in my '82, LG4 engine. What was put in was a CS274. I understand this to be a stock replacement cam and by no means a high performance item. Tune up was done at the same time. Other than having the original cat replaced (did help it breath) and running a K&N filter this is all stock. Looking at the specs though the 274 seems to be a better cam. Being a low compression 305 this might be as much as you would go?

Question is, will a dual snorkel air cleaner and headers and better/bigger exhaust help this engine? Or is there no need for that?

Thanks,

Ron

 

I don't think you can go wrong with that setup, from what I have gathered for my own ideas for a 305 is whatever you can do to free up more air intake/exhaust you are going to add power. How much ? That is hard to quantify, but my guess would be around 30 hp for new headers, free flowing exhaust, and additional air intake via the dual snorkel.

This may be helpful
http://www.hioutput.com/tech/290hp/290hp.html