455 olds roller rockers
#1
455 olds roller rockers
I have a 73 jet boat with a 455. I will be pulling the heads and timing cover to regasket. I did have engine running but was getting a lill water in oil. Seems this is quite normal for marine 455. when apart I have a set of roller rockers I want to install. Has hyd lifters. First question:
1. The studs will screw into the heads where the solid mounts were without mod correct?
2. would guide plates be required?
3. Would the roller rockers change the pushrod length?
.
I have built sbc's but this is my first time digging into BBO So I'm a newbie any help ia greatly appreciated.
1. The studs will screw into the heads where the solid mounts were without mod correct?
2. would guide plates be required?
3. Would the roller rockers change the pushrod length?
.
I have built sbc's but this is my first time digging into BBO So I'm a newbie any help ia greatly appreciated.
Last edited by Scott Brandenburg; April 11th, 2020 at 03:22 AM.
#2
2. would guide plates be required?
3. Would the roller rockers change the pushrod length?
#3
On the water in oil, jet boats often have way too much pressure in the cooling line off the jet pump. Like 60 psi or more. This tends to blow front cover and head gaskets.. Put a ball valve in this line and close it until you just have some movement off 100 on your water temp gauge. You could also hook up a pressure gauge and see what your coolant pressure is and make changes to keep it under 15. Do you have the water exiting to the exhaust or over the side?
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