Edelbrock Jrs, Hemi

[Bird 426]

Was setting up yesterday to eyebrow the top of my cyls for the Edelbrock Jr intake valves. With a a Felpro #1104 gasket and the head on with 3 bolts , I have roughly .050 between the intake and the cyl. That's looking in from the bottom with the piston out. Am I missing something? Why do I need to notch the cyl top? They want .030. Or should I just call Edelbrock?

 

[Nxcoupe]

Was setting up yesterday to eyebrow the top of my cyls for the Edelbrock Jr intake valves. With a a Felpro #1104 gasket and the head on with 3 bolts , I have roughly .050 between the intake and the cyl. That's looking in from the bottom with the piston out. Am I missing something? Why do I need to notch the cyl top? They want .030. Or should I just call Edelbrock?

View attachment 1643022

Is your bore stock?

 

[pnora]

Was setting up yesterday to eyebrow the top of my cyls for the Edelbrock Jr intake valves. With a a Felpro #1104 gasket and the head on with 3 bolts , I have roughly .050 between the intake and the cyl. That's looking in from the bottom with the piston out. Am I missing something? Why do I need to notch the cyl top? They want .030. Or should I just call Edelbrock?

View attachment 1643022

Did you read the instructions?

 

[6PKRTSE]

A smaller bore (stock or say +.030) will need it. A larger bore like a 4.500 may not.

 

[steve340]

The eyebrow would allow the intake charge (or more of it) to flow out around the valve area near the bore.
If the valve is too shrouded it will restrict flow.
Be careful not to grind until the head gasket is compromised or you weaken the top of the block.

 

[Bird 426]

4.320 bore.

 

[POMONAMISSEL]

notch for better flow

 

[Bird 426]

Okay, will notch it a little, maybe half way to the head gasket. I have it layed out .
Thanks everyone.

 

[steve340]

So long as you stay 20 thousands inside the head gasket you will be fine.
Pays also to know were the top piston ring comes up to also.

 

[rickseeman]

If you have .050" you don't have to do anything. When I put together a 4.25" bore the valve would only go down about .050" before it hit the deck.

 

[pnora]

CHECKING PISTON-TO-VALVE, VALVE-TO-BORE AND PISTON-TO-
HEAD CLEARANCES: Prior to installation, it is highly recommended
that valve-to-piston clearances are checked and corrected to minimum
specs, if necessary. These cylinder heads have larger-than-stock
valve sizes and will not work with the valve pockets in stock pistons,
especially if a high lift cam is used. The use of aftermarket pistons
and/or custom machining to your pistons is required. Actual valve-to-
piston clearance should be specified by your camshaft manufacturer.
Valve-to-bore clearance should also be checked, and the top of the
bore notched for clearance, if necessary (Min Clearance 0.030”).

 

[Bird 426]

I have a light spring on the #1 intake, I can push the valve down until the spring bottoms out. The picture at the top of the page here, you can see the gap at the top of the cyl and head of the valve. The picture makes it look larger, but it's .050 or a hair more gap or clearance there.

 

[Bird 426]

I agree on the valve to piston clearance, haven't gotten that far yet. No cam, I do have my old one, it's 605 lift and pistons were cleared for that, but not the Eddy heads larger intake. I still have a lot of little fires to put out!

 

[rickseeman]

You're not going to have a problem at that lift.