Engine Quest Head work results
05-18-2019 | 01:18 PM
#221
Registered
Joined: Jan 2018
Posts: 198
Likes: 0
MT,
I'm setting up my EQ 320 head's with the same parts as yours including the Comp 4035 stud girdle & 1820-16 Ultra pro magnum XD rockers.
Stud Girdle
What ARP rocker studs did you use:
135-7101. That are 1.75" from the base
https://www.allensfasteners.com/deta...D=ARP-135-7101
Or
135-7102 that are 2.35" from the base
https://www.allensfasteners.com/deta...D=ARP-135-7202
I'm setting up my EQ 320 head's with the same parts as yours including the Comp 4035 stud girdle & 1820-16 Ultra pro magnum XD rockers.
Stud Girdle
What ARP rocker studs did you use:
135-7101. That are 1.75" from the base
https://www.allensfasteners.com/deta...D=ARP-135-7101
Or
135-7102 that are 2.35" from the base
https://www.allensfasteners.com/deta...D=ARP-135-7202
Last edited by Mohavvalley; 05-18-2019 at 07:54 PM.
05-20-2019 | 10:27 AM
#222
Registered
Joined: Jan 2018
Posts: 198
Likes: 0
Bump...I also found these ARP 100-7101 with 1.9" effective length.
https://www.allensfasteners.com/deta...D=ARP-100-7101
Anybody know what effective length rocker studs to run with these head's, rockers, & girdles?
https://www.allensfasteners.com/deta...D=ARP-100-7101
Anybody know what effective length rocker studs to run with these head's, rockers, & girdles?
Last edited by Mohavvalley; 05-21-2019 at 11:52 AM.
04-18-2020 | 10:16 AM
#227
Registered
Joined: Jan 2006
Posts: 3,865
Likes: 793
From: St. Pete Beach, FL
Congrats. I'd imagine they sound a little more snappy. I think we might be heading to the dyno next week.
In the meantime, been working on a 598" refresh and go. Found all kinds of unexpected issues from the original builder but I've addressed them all. There were only 100 or so hours on it. It's a shame... I expect it will make 850 hp when all said and done. Not EQ heads but Big Brodie O 351's.
Attachment 554820Attachment 554821
In the meantime, been working on a 598" refresh and go. Found all kinds of unexpected issues from the original builder but I've addressed them all. There were only 100 or so hours on it. It's a shame... I expect it will make 850 hp when all said and done. Not EQ heads but Big Brodie O 351's.
Attachment 554820Attachment 554821
02-26-2021 | 12:02 PM
#228
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
Hoagie Roll, the engines turned out great. The boat ran great as well and picked up over 10 mph from the stock MPI's. With regards to the heads, I was less than impressed. In hindsight, I don't think I would use them again, live and learn.
Upon completion of last season the engines had 300 hours on them and were due for a top end rebuild. I tore the engines down a few weeks ago and serviced the heads and found the following;
1. All 16 exhaust seats had to be replaced. The seats were not hardened and the valves sunk.
2. All 32 guides needed to be replaced. Apparently they had guides from the factory that are better served for Titanium valves. They were also originally honed from 5/16 to 11/32.
3. Had one broken exhaust valve spring which could just be age.
4. Had to replace 3 intake seats
5. Had to replace two inake valves.
6. Had to replace two exhaust valves.
All in all for 300 hours the heads were shot and needed a total rebuild. Not at all what I would expect from a set of brand new heads. The cam was mild (Crane 268741) and not hard on valvetrain. The owner was very hard on the boat but in general, I think the combo of unhardened seats and the wrong valve guides installed from the factory made these heads have excessive wear. Luckilly there wasn't a failure. Mind you, I bought the heads bare. All Manley valves were used and Comp Springs/Retainers/Locks.
Regardless, it's all been freshened and going back together as we speak. He'll be good for another 300hrs of hard running! I'm not on here much so I don't read messages. It's better to get me on Facebook if you have any questions; https://www.facebook.com/FUMarine
Frank
Upon completion of last season the engines had 300 hours on them and were due for a top end rebuild. I tore the engines down a few weeks ago and serviced the heads and found the following;
1. All 16 exhaust seats had to be replaced. The seats were not hardened and the valves sunk.
2. All 32 guides needed to be replaced. Apparently they had guides from the factory that are better served for Titanium valves. They were also originally honed from 5/16 to 11/32.
3. Had one broken exhaust valve spring which could just be age.
4. Had to replace 3 intake seats
5. Had to replace two inake valves.
6. Had to replace two exhaust valves.
All in all for 300 hours the heads were shot and needed a total rebuild. Not at all what I would expect from a set of brand new heads. The cam was mild (Crane 268741) and not hard on valvetrain. The owner was very hard on the boat but in general, I think the combo of unhardened seats and the wrong valve guides installed from the factory made these heads have excessive wear. Luckilly there wasn't a failure. Mind you, I bought the heads bare. All Manley valves were used and Comp Springs/Retainers/Locks.
Regardless, it's all been freshened and going back together as we speak. He'll be good for another 300hrs of hard running! I'm not on here much so I don't read messages. It's better to get me on Facebook if you have any questions; https://www.facebook.com/FUMarine
Frank
03-01-2021 | 11:40 AM
#229
Registered
Joined: Jan 2006
Posts: 3,865
Likes: 793
From: St. Pete Beach, FL
Hoagie Roll, the engines turned out great. The boat ran great as well and picked up over 10 mph from the stock MPI's. With regards to the heads, I was less than impressed. In hindsight, I don't think I would use them again, live and learn.
Upon completion of last season the engines had 300 hours on them and were due for a top end rebuild. I tore the engines down a few weeks ago and serviced the heads and found the following;
1. All 16 exhaust seats had to be replaced. The seats were not hardened and the valves sunk.
2. All 32 guides needed to be replaced. Apparently they had guides from the factory that are better served for Titanium valves. They were also originally honed from 5/16 to 11/32.
3. Had one broken exhaust valve spring which could just be age.
4. Had to replace 3 intake seats
5. Had to replace two inake valves.
6. Had to replace two exhaust valves.
All in all for 300 hours the heads were shot and needed a total rebuild. Not at all what I would expect from a set of brand new heads. The cam was mild (Crane 268741) and not hard on valvetrain. The owner was very hard on the boat but in general, I think the combo of unhardened seats and the wrong valve guides installed from the factory made these heads have excessive wear. Luckilly there wasn't a failure. Mind you, I bought the heads bare. All Manley valves were used and Comp Springs/Retainers/Locks.
Regardless, it's all been freshened and going back together as we speak. He'll be good for another 300hrs of hard running! I'm not on here much so I don't read messages. It's better to get me on Facebook if you have any questions; https://www.facebook.com/FUMarine
Frank
Upon completion of last season the engines had 300 hours on them and were due for a top end rebuild. I tore the engines down a few weeks ago and serviced the heads and found the following;
1. All 16 exhaust seats had to be replaced. The seats were not hardened and the valves sunk.
2. All 32 guides needed to be replaced. Apparently they had guides from the factory that are better served for Titanium valves. They were also originally honed from 5/16 to 11/32.
3. Had one broken exhaust valve spring which could just be age.
4. Had to replace 3 intake seats
5. Had to replace two inake valves.
6. Had to replace two exhaust valves.
All in all for 300 hours the heads were shot and needed a total rebuild. Not at all what I would expect from a set of brand new heads. The cam was mild (Crane 268741) and not hard on valvetrain. The owner was very hard on the boat but in general, I think the combo of unhardened seats and the wrong valve guides installed from the factory made these heads have excessive wear. Luckilly there wasn't a failure. Mind you, I bought the heads bare. All Manley valves were used and Comp Springs/Retainers/Locks.
Regardless, it's all been freshened and going back together as we speak. He'll be good for another 300hrs of hard running! I'm not on here much so I don't read messages. It's better to get me on Facebook if you have any questions; https://www.facebook.com/FUMarine
Frank
03-02-2021 | 03:42 PM
#230
Frank's Marine Service
Joined: Sep 2002
Posts: 11,959
Likes: 142
From: Elkton, MD
