i found some 305 heads that are completely rebuily....they are 53cc head tho....would i see much hp gain from those or would those mess anything up...just wondering...any info would be great

 

Must be the 14022601 HO heads. They are actually 267 heads that were used on 305s to raise the compression ratio. I ran a set on my originol 305 when it was in my van (came on it). With a RV cam and dual exhaust but everything else stock it dynoed 250 RWHP and 280 ft/lbs of torque. Great running engine just not big enough for heavy towing in a G20 van.

 

are they worth it for 200 bucks for the set...will i see much power gain

 

just wondering..people have always told me 601 heads are 58cc....but i just looked the casting number up and they are 53cc.....would i see much perfromance by goin to 53cc heads

 

Just the compression increase alone won't be worth a ton of power, probably not worth the head swap. But what heads are you running now? If you still have the stock swirl ports then yeah they would be well worth your time. Probably worth 30 HP or more if they flow any where near L98's. You can't beat 200 bucks either considering thats what I paid for guides on my last rebuild. If you do have swirl ports check out the thread going on now, there is some very good info in that thread as to how bad the swirl ports are and what other heads make power wise in comparison. You'll just have to ignore the BS thats flying and read the facts.