Questions about the Mercury Racing 525
Charter Member
Platinum Member
09-10-2012, 06:46 AM
#36
Registered
Join Date: Mar 2009
Location: Merritt Island FL
Posts: 95
Likes: 0
Received 0 Likes
on
0 Posts
Update
Was told this was a 525 head. After sending pics to Mercury racing it turns out this is the new 502 430 HP motor head. Has std BBC exhaust bolt pattern. The head is manufactured by Edelbrock, however they will not confirm what head it is. Having the intake port, exhaust port and combustion chamber CC’ed reveled this head is the Edelbrock RET port head.
Marine Duty Performer RPM 454-O & 454-R
• Heavy-duty, 1.89" Inconel exhaust valves provide added durability for marine applications
• Hard anodized black 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
Cylinder Head Specifications
Combustion chamber volume 110cc
Intake runner volume 290cc
Exhaust runner volume 110cc
Intake valve diameter 2.25"
Exhaust valve diameter 1.89"
Valve stem diameter 11/32"
Valve guides Manganese bronze
Deck thickness 9/16"
Valve spring diameter Springs Not Included
Valve spring maximum lift Springs Not Included
Rocker stud 7/16"
Guideplate Hardened steel
Pushrod diameter 3/8"
Valve angle 26°
Exhaust port location Stock
Spark plug fitment 14mm x 3/4 reach, gasket seat
Made In USA
Technical Notes: Match with Edelbrock head gasket sets. Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.
Description Bare (Single) Complete (Single)
Marine-Duty Performer RPM 454-0 Oval Port (110 combusion chamber) N/A 61459*
Marine-Duty Performer RPM 454-R Rect. Port (118 combustion chamber) N/A 61559*
Notes: Valve springs not included. Please consult your camshaft manufacturer when selecting springs to match your camshaft.
Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
#61459
Valve Lift .100" .200" .300" .400" .500" .600" .700"
Intake 73 143 208 251 284 299 -
Exhaust 71 128 153 178 200 218 -
Marine Duty Performer RPM 454-O & 454-R
• Heavy-duty, 1.89" Inconel exhaust valves provide added durability for marine applications
• Hard anodized black 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
Cylinder Head Specifications
Combustion chamber volume 110cc
Intake runner volume 290cc
Exhaust runner volume 110cc
Intake valve diameter 2.25"
Exhaust valve diameter 1.89"
Valve stem diameter 11/32"
Valve guides Manganese bronze
Deck thickness 9/16"
Valve spring diameter Springs Not Included
Valve spring maximum lift Springs Not Included
Rocker stud 7/16"
Guideplate Hardened steel
Pushrod diameter 3/8"
Valve angle 26°
Exhaust port location Stock
Spark plug fitment 14mm x 3/4 reach, gasket seat
Made In USA
Technical Notes: Match with Edelbrock head gasket sets. Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.
Description Bare (Single) Complete (Single)
Marine-Duty Performer RPM 454-0 Oval Port (110 combusion chamber) N/A 61459*
Marine-Duty Performer RPM 454-R Rect. Port (118 combustion chamber) N/A 61559*
Notes: Valve springs not included. Please consult your camshaft manufacturer when selecting springs to match your camshaft.
Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
#61459
Valve Lift .100" .200" .300" .400" .500" .600" .700"
Intake 73 143 208 251 284 299 -
Exhaust 71 128 153 178 200 218 -
Thread
Thread Starter
Forum
Replies
Last Post
DaveP
General Boating Discussion
0
01-24-2002 12:38 AM
