Head choice for a 509 with iron heads
#32
Registered
Thread Starter
Join Date: Sep 2015
Posts: 81
Likes: 0
Received 0 Likes
on
0 Posts
I had a similar issue didnt listen to my motor man bought pre Assembled heads 20 hrs in hung three valves valve stem clearance was too tight had to fresh the motor world products Only would help with parts and the work order clearly stated for marine use so I total agree bare heads and build them up
I sucked a bunch of water back up into the motor complete refresh fun fun
I sucked a bunch of water back up into the motor complete refresh fun fun
#33
Platinum Member
Platinum Member
We used tcast Iron heads and had Jim Valako touch them up. My suggestion is to call Jim and get his advice on which cast iron heads would be best for your combination. He got them to flow similar the the AFR heads.
#34
32 degrees timing in your application is not enough lead imho.. Will put unwanted heat at the exhaust valve... You would be able to get away with this if the engines were 572's 598's or bigger cid... But in your application a few more degrees of lead wouldn't hurt you a bit!! Just my 2 cents
#38
Registered
iTrader: (3)
imo,the engine quest 320 head would be a good choice,good head at a very fair price,if you want aluminum on a budget look into ak racing pro maxx 317 heads.afr 305 is also a good choice.as mild thunder already stated,the best cylinder heads won,t show much improvement if the exhaust system won,t let the exhaust get out.
Last edited by mike tkach; 07-19-2017 at 05:09 PM.
#40
Registered
iTrader: (1)
Diamond Marine Thunder and Lightning cast headers (used to be KE) - make sure tail (including tailpipes) is 18"-19" long total length.
Thunder-N-Lightning Cast Aluminum Exhaust Headers :: Thunder & Lightning Headers :: Exhaust Systems :: Diamond Performance Parts
Thunder-N-Lightning Cast Aluminum Exhaust Headers :: Thunder & Lightning Headers :: Exhaust Systems :: Diamond Performance Parts