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to notch or not to notch the block #170306
12/18/08 09:02 PM
12/18/08 09:02 PM
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tjmarcus1 Offline OP
top fuel
tjmarcus1  Offline OP
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Joined: Nov 2004
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how many of you do? how many of you don't? i'm talking about notching the top of the bore for unshrouding the valves?

Re: to notch or not to notch the block [Re: tjmarcus1] #170307
12/18/08 09:04 PM
12/18/08 09:04 PM
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State of confusion
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Thumperdart Offline
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Thumperdart  Offline
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Now I know why my pig won`t run. Mine wasn`t done not even sure it would help my car w/a 2.14 intake.

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72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: to notch or not to notch the block [Re: tjmarcus1] #170308
12/18/08 09:12 PM
12/18/08 09:12 PM
Joined: Jan 2003
Posts: 16,916
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440Jim Offline
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440Jim  Offline
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I am running a 4.375" bore and 2.25" intake valve, without "notching" the bore. However, a 1/8" down "blend" could be a worth considering. I don't want to get anywere near the top of the ring travel. It may be more important to look at the combustion chamber "eyebrow" to blend to the cylinder.


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1
Re: to notch or not to notch the block [Re: 440Jim] #170309
12/18/08 09:38 PM
12/18/08 09:38 PM
Joined: Sep 2003
Posts: 1,397
Toronto Ontario, Can
Glen440 Offline
pro stock
Glen440  Offline
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Joined: Sep 2003
Posts: 1,397
Toronto Ontario, Can
I just notched the cylinders on my 511 on the intakes, also the heads a little. The 2.30 intake valve I figured could use it on the B1 heads. I didn't go nuts but a decent blend in the eye brow.

I won't get any accurate numbers to see if it helped as I won't put it back on the chassis dyno, gonna go to the engine dyno this time. My only track outing didn't go well last year.


87 dakota 6.1 hemi
Re: to notch or not to notch the block [Re: tjmarcus1] #170310
12/18/08 10:00 PM
12/18/08 10:00 PM
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Posts: 6,591
Canton, Ohio
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Sport440 Offline
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Canton, Ohio
I do I would also include clearencing the head chamber at the valve eyebrow to match.

I consider it part of the finishing port work of the heads and block and the entire air/fuel flow path. Even with a 906 head with a 2.08 valve one can see the benefits of this IMO

Just do a before and after "notching" visual look of the head mounted on the block with a intake valve fixed at .500 lift or so. As Viewed from the the crankshaft side of the engine.

That should convince anyone IMO, not only that but where you do the Notching, thats very Near the Highest flowing part of the port on the intake side.

Now on the exhaust, Im not sure of the highest flow path, and the valve is a smaller Diameter. So I mostly focus on matching and blending the intake side, and just breaking the sharp edge a little on the exhaust side. mike

Last edited by Sport440; 12/18/08 10:21 PM.
Re: to notch or not to notch the block [Re: Sport440] #170311
12/19/08 12:13 AM
12/19/08 12:13 AM
Joined: Jan 2003
Posts: 5,484
SoCal
Brian Hafliger Offline
master
Brian Hafliger  Offline
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Joined: Jan 2003
Posts: 5,484
SoCal
I do it on some stuff....


Brian Hafliger






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