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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. https://www.offshoreonly.com/forums/...ml#post4421259 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 |
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? |
I know this is an old thread on these heads but I just ordered a set and I’m kinda stumped on valve length🤷♂️ It a says.250 long for intake and .100 long for exhaust. Is that what has been working for these? Thanks.
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Yes. Thats pretty much the standard on aftermarket performance bbc heads .
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So what spark plugs are being used for these heads? Only 137 different kinds to choose from🤷♂️ Thanks
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.750 reach plugs . I used autolite AR3933 , but it was supercharged.
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Originally Posted by Panther
(Post 4433762)
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 |
Originally Posted by hogie roll
(Post 4734397)
How did these turn out? Cam and intake?
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 https://cimg7.ibsrv.net/gimg/www.off...f6f0a701d0.jpg |
Originally Posted by Panther
(Post 4779172)
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 https://cimg7.ibsrv.net/gimg/www.off...f6f0a701d0.jpg |
Originally Posted by hogie roll
(Post 4779549)
Thats disappointing, nice head on paper. Did you know they have a harder seat option?
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