454 rebuild Engine noisy
Thread Starter
Advanced
Joined: Mar 2003
Posts: 98
Likes: 3
From: Oglesby Illinois
OK, i will try to answer all your questions as best i can.
All parts are stock short of the pistons only because i couldn't find the stock piston. Same dome height, a “slight” bit more compression. Pistons are Summit P# SLP-L2399NF30. We put in a new high volume oil pump. We did mic everything before the rebuild and all was well within spec. New main and rod bearings, new timing gears and chain, new stock spark plugs gapped at 0.035", new motor mounts, new fuel pump. The oil pressure at start up is almost 70psi, once warm runs at about 50psi. I never put less than 93 octane in the car but i currently do have octane booster in with the 93 octane gas for the first time ever. The timing and points were never touched and put back at the exact location as they were prior to the rebuild. This rebuild was not done by a shop, me and my "mechanic" brother-in-law did the rebuild. He has rebuilt all kinds of engines, from Harleys, snowmobiles to cars, and I mean a lot of them. That certainly doesn't make him a reputable mechanic but is better in my mind than a shop that i don't have lots of experience with. I have not checked the timing yet as we just got it together and i have only test driven it once. I did listen more closely last night and it seems to be coming from under the car so i suspect maybe an exhaust leak between the manifolds and pipe. I did notice that there is exhaust gas coming out of those connections on both sides of the car. Not convinced that is it though.
All parts are stock short of the pistons only because i couldn't find the stock piston. Same dome height, a “slight” bit more compression. Pistons are Summit P# SLP-L2399NF30. We put in a new high volume oil pump. We did mic everything before the rebuild and all was well within spec. New main and rod bearings, new timing gears and chain, new stock spark plugs gapped at 0.035", new motor mounts, new fuel pump. The oil pressure at start up is almost 70psi, once warm runs at about 50psi. I never put less than 93 octane in the car but i currently do have octane booster in with the 93 octane gas for the first time ever. The timing and points were never touched and put back at the exact location as they were prior to the rebuild. This rebuild was not done by a shop, me and my "mechanic" brother-in-law did the rebuild. He has rebuilt all kinds of engines, from Harleys, snowmobiles to cars, and I mean a lot of them. That certainly doesn't make him a reputable mechanic but is better in my mind than a shop that i don't have lots of experience with. I have not checked the timing yet as we just got it together and i have only test driven it once. I did listen more closely last night and it seems to be coming from under the car so i suspect maybe an exhaust leak between the manifolds and pipe. I did notice that there is exhaust gas coming out of those connections on both sides of the car. Not convinced that is it though.
Instructor
Joined: Mar 2010
Posts: 102
Likes: 0
From: Livingston TN
OK, i will try to answer all your questions as best i can.
All parts are stock short of the pistons only because i couldn't find the stock piston. Same dome height, a “slight” bit more compression. Pistons are Summit P# SLP-L2399NF30. We put in a new high volume oil pump. We did mic everything before the rebuild and all was well within spec. New main and rod bearings, new timing gears and chain, new stock spark plugs gapped at 0.035", new motor mounts, new fuel pump. The oil pressure at start up is almost 70psi, once warm runs at about 50psi. I never put less than 93 octane in the car but i currently do have octane booster in with the 93 octane gas for the first time ever. The timing and points were never touched and put back at the exact location as they were prior to the rebuild. This rebuild was not done by a shop, me and my "mechanic" brother-in-law did the rebuild. He has rebuilt all kinds of engines, from Harleys, snowmobiles to cars, and I mean a lot of them. That certainly doesn't make him a reputable mechanic but is better in my mind than a shop that i don't have lots of experience with. I have not checked the timing yet as we just got it together and i have only test driven it once. I did listen more closely last night and it seems to be coming from under the car so i suspect maybe an exhaust leak between the manifolds and pipe. I did notice that there is exhaust gas coming out of those connections on both sides of the car. Not convinced that is it though.
All parts are stock short of the pistons only because i couldn't find the stock piston. Same dome height, a “slight” bit more compression. Pistons are Summit P# SLP-L2399NF30. We put in a new high volume oil pump. We did mic everything before the rebuild and all was well within spec. New main and rod bearings, new timing gears and chain, new stock spark plugs gapped at 0.035", new motor mounts, new fuel pump. The oil pressure at start up is almost 70psi, once warm runs at about 50psi. I never put less than 93 octane in the car but i currently do have octane booster in with the 93 octane gas for the first time ever. The timing and points were never touched and put back at the exact location as they were prior to the rebuild. This rebuild was not done by a shop, me and my "mechanic" brother-in-law did the rebuild. He has rebuilt all kinds of engines, from Harleys, snowmobiles to cars, and I mean a lot of them. That certainly doesn't make him a reputable mechanic but is better in my mind than a shop that i don't have lots of experience with. I have not checked the timing yet as we just got it together and i have only test driven it once. I did listen more closely last night and it seems to be coming from under the car so i suspect maybe an exhaust leak between the manifolds and pipe. I did notice that there is exhaust gas coming out of those connections on both sides of the car. Not convinced that is it though.
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
You are running open chamber pistons with closed chamber heads.
Those pistons have such a small dome that they usually clear, but if you run out of easy things to check you may look into piston to chamber clearance issues.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
I bet your piston to cylinder wall clearance is too big. Sounds like no overbore. Forged pistons a lot of times have a little rattle until the engine warms up even if the clearance is exact. If you used a stock bore piston in worn then honed cylinder there is no way the clearance is correct. I have never seen a 40 year old block that didn't have some wear and taper. Should have bored it and torque plate honed it to an oversized piston to get correct clearance and eliminate all taper especially using forged pistons.
