35 Lightening & 38 Lightening
08-17-2018 | 06:38 AM
#11
Registered
Joined: Apr 2013
Posts: 194
Likes: 0
From: Groton, CT.
Buy the 525 boat , install some stainless marine exhaust before the cmi's ruin your day , and go run the s**t out of it. I'm told the later cmi's were better but I ain't buyin it, especially in salt water. Voice of experience .
08-17-2018 | 08:29 AM
#12
Registered
Joined: Nov 2014
Posts: 330
Likes: 148
What year is the 525 boat? I believe 05 and a half and 06 was the change over year for headgaskets and head bolts. Look at the head bolts, if they have a con-cave and a plus sign stamped they are gm junk and you should pull the heads for refresh. If they are arp leave the heads on and do springs, retainers, locks. Contact Eddie Young about which springs and retainers to use, he has a recommended setup over the stock pac springs.
Also look at the header tubes by the cylinder head. If they remain the same circumference the entire way to the flange they are the older style cmi’s(ran 350 hours with no issues with ours). If the tube gets skinnier before the header flange those are the revised headers. When you do the valve springs just pressure test them with a garden hose for reassurance.
Also look at the header tubes by the cylinder head. If they remain the same circumference the entire way to the flange they are the older style cmi’s(ran 350 hours with no issues with ours). If the tube gets skinnier before the header flange those are the revised headers. When you do the valve springs just pressure test them with a garden hose for reassurance.
08-17-2018 | 11:01 AM
#13
Registered
Joined: Jun 2007
Posts: 7,309
Likes: 1,815
From: Merritt Island, FL
What year is the 525 boat? I believe 05 and a half and 06 was the change over year for headgaskets and head bolts. Look at the head bolts, if they have a con-cave and a plus sign stamped they are gm junk and you should pull the heads for refresh. If they are arp leave the heads on and do springs, retainers, locks. Contact Eddie Young about which springs and retainers to use, he has a recommended setup over the stock pac springs.
Also look at the header tubes by the cylinder head. If they remain the same circumference the entire way to the flange they are the older style cmi’s(ran 350 hours with no issues with ours). If the tube gets skinnier before the header flange those are the revised headers. When you do the valve springs just pressure test them with a garden hose for reassurance.
Also look at the header tubes by the cylinder head. If they remain the same circumference the entire way to the flange they are the older style cmi’s(ran 350 hours with no issues with ours). If the tube gets skinnier before the header flange those are the revised headers. When you do the valve springs just pressure test them with a garden hose for reassurance.
