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Sit N' Spin
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1,423 Posts
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Anyone here have any experience with these on a jet boat BBC? I'm considering running a pair of them and would like some input on how well they perform if anyone here has any experience with them.
 

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Cantard
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5,017 Posts
Anyone here have any experience with these on a jet boat BBC? I'm considering running a pair of them and would like some input on how well they perform if anyone here has any experience with them.
No experience in a jet boat but have used a set and they worked better than I thought they ever would. 575hp pump gas 468 hydraulic flat tappet. GM performance parts head is the same head.
 

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307 Posts
If you are buying new, they have a marine version with upgraded valves and the heads are hard anodized. The one thing I heard was that the valve guide clearance needed to be checked because they tend to be tight.

from the Edelbrock site:
MARINE-DUTY PERFORMER RPM 454-O AND 454-R

Heavy-duty, 1.89" Inconel exhaust valves provide added durability for marine applications
Hard anodized to protect the aluminum in the harsh marine environment
Sold with valves only to allow for valve spring choices
Match with an Edelbrock Performer RPM manifold, Performer Series 750 cfm marine carb and Performer RPM cam for proven performance
Smaller-than-stock 11/32" valve stems promote excellent flow and lighter valve weight
I have a set of the marine version on my engine, but have not run it yet. The machine shop had to open up the clearance on the valve guides, they were just a touch too tight.

http://www.jegs.com/webapp/wcs/stores/servlet/ProductDisplayPopup?storeId=10001&catalogId=10002&productId=758339&itemId=69960&langId=-1&showValue=1

http://www.jegs.com/webapp/wcs/stores/servlet/ProductDisplayPopup?storeId=10001&catalogId=10002&productId=758339&itemId=69958&langId=-1&showValue=1



 

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Mine arent the anodized version, but I'm not around salt water so I wasnt too worried. I got mine bare...(actually purchased them for a car years ago, but they never got used) Yup, valve guides can be tight...
 

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E-7 Sheepdog (ret)
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Definitely don't want them to "grab" a valve jetaholic. The effect may look eerilly similar to something else. :)
 

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No experience in a jet boat but have used a set and they worked better than I thought they ever would. 575hp pump gas 468 hydraulic flat tappet. GM performance parts head is the same head.
Hey i know this is an old thread but i am considering running the edelbrock performer marine head in my 24 foot excalibur on a 454 with gm forged crank rods pistons holley 800, with stainless marine exhaust, havent picked an intake or cam yet and im wondering what intake and cam you ran to get numbers like that.

If you want to shoot me an email feel free [email protected]
 
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