So I have a 77 302 that is going into my mustang, I've mentioned this before. I have the factory 289 that came out of the car, would I be better off putting the 289 heads on the 302 or should I leave the 302 heads on it? The 302 heads were obviously during the smog craze and they're out of an f100 from the time. I just want to know if anyone thinks it would be better to go with the 289 heads or not. I could probably get them ported and polished and make some better power with them. Would I see a power gain from switching to the 289 heads, since they're pre smog?
I should clarify that both of these heads are 2v heads, and they'll both be stock more than likely. I don't have the money laying around to do anything with them at the moment, I was just wondering if I could get better performance out of the 289 heads over the 302 heads due to smog regulations.
So is there a difference in the intake ports on the head? The engine is out of the car right now and I could replace heads fairly easily. Which heads would you pick? Looking for honest opinions on this.
Everything is good on the 289 heads. I'm not sure what pistons are in the 302 block as it has been bored .030 over. My grandpa did the rebuild a while ago, so it's hard for him to remember exactly what went into it. How much is the average porting job?
Time is money... There used to be a place called Powerheads where you could send your heads and for $1k they would cnc port them. Looks like inexpensive aluminum heads have put them out of business.
Spending $ on porting iron heads just does not make sense these days. You can get aluminum heads from places like Skip White for $750. Are they the best? No, but will out perform a stock head with average port job.
Trent do a search for the Mustang Barn. They have a tech article on porting 289 heads. Cheap performance upgrade by opening up the exhaust. I did this to the engine in my Tiger and can't wait to start and break it in. I also have the C90z hydraulic cam. It's the hydraulic hypo cam. The owner Dan also will curve your your distributor to the proper specs. Another reasonable performance tip. A member on another Mustang forum got 320 hp. With this set up, using a 4 barrel carb and manifold. Bill