iron or alum.
 

in a 540 build up n/a not blown is it worth the expense to alum. or can i build decent power with iron
thanks in advance

Budah is correct. If all is the same iron is better and makes more power. For a boat iron is better anyway (in my opinion) because of less need for worry. Such as salt.
There are enough choices out there that you can get a pair of irons to flow as easily as aluminums on a 540.

my .02
DAVE

salt water??? Stay away from aluminum. You wouldn't believe what it does to it:eek:
Freshwater , it's your call. I ran a set of Trickflows on my 540 Ford , was it worth the expense...probably not:(
Marine application , irons probably the best bet;)

well i have a 139741 roller cam and a fairly light boat with a single screw tubular headers and a bravo out drive like i said in my previous post i am going to run n/a not super charged if i go with iron what is the max compression with pump gas or if i go alum. is there a 60 hp difference or will it be smaller just want to learn from your guys experience
thanks

oh also boat will probally never see salt water
thanks again

ttt

thanks budah already have a nickerson 980 and a rpm air gap thinking of canfields though is there that much difference between afr and canfeilds
thanks bo

My preference, but I'd take the AFR's over the Canfield's any day. Get the AFR CNC ported 315cc heads---they have really HOT air flow charactoristics. If I ever buy another set of aluminum heads it will be the AFR CNC heads. "Bad to the Bone" went with the AFR CNC 315cc heads on his naturally aspirated 540's and he said the engines acted totally different----and his boat (35' Cig) responded well to the change as well! He is very happy with the AFR's.

Man...it's good to see BUDAH on the board sharing info.......thanks man....;)

You too Kaama.....:)