Head Gasket Bore
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,438
Likes: 41
From: Raleigh NC
St. Jude Donor '13-'14
Head Gasket Bore
I'll be using either Brodix 64cc IK180 head or Dart Iron Eagle 64cc/180cc and am trying to pick my head gasket. What bore of a head gasket do I use on my 350? I go to summit and I got a million choices from 4.000 to 4.250. The block is not zero decked, but I figured I would not want a gasket that matches the bore exactly.
Or will they all work and the bore diameter is dependent on the type of gasket I choose?
Or will they all work and the bore diameter is dependent on the type of gasket I choose?
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
I'll be using either Brodix 64cc IK180 head or Dart Iron Eagle 64cc/180cc and am trying to pick my head gasket. What bore of a head gasket do I use on my 350? I go to summit and I got a million choices from 4.000 to 4.250. The block is not zero decked, but I figured I would not want a gasket that matches the bore exactly.
Or will they all work and the bore diameter is dependent on the type of gasket I choose?
Or will they all work and the bore diameter is dependent on the type of gasket I choose?
Just go to a local parts house and get a set of Mr. Gasket or Fel-Pro head gaskets for your year block. They will work with your heads and the bore won't be the same.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,438
Likes: 41
From: Raleigh NC
St. Jude Donor '13-'14
Well I'm trying to calculate my CR, so the bore does matter. Infact, to get a 10:1, I need something along the lines of 4.000 bore and a 0.028 compressed thickness. So if I cannot use a 4.000 inch bore gasket, I need to recalculate. My goal is 10:1.
Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,438
Likes: 41
From: Raleigh NC
St. Jude Donor '13-'14
Race Director
Joined: Nov 2002
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From: Taylor Michigan
You can use the standard bore head gaskets up to .030 over. You must keep the gaskets fire ring out of the bore. Felpro 7733 PT1 is the number is I recall correctly. The best gasket for aluminum heads is one made of copper. Otherwise the GM gasket for aluminum heads would be my second choice. McCord copper gaskets if you can find them was OEM on all the 427 L88`s and the 426 A990 Hemi. Hard to find though and only was available in full sets. 
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Thread Starter
Melting Slicks
Joined: May 2006
Posts: 3,438
Likes: 41
From: Raleigh NC
St. Jude Donor '13-'14
I'm not sure if I'm going aluminum and getting the Brodix 180K yet, but the Dart Iron Eagle Platinums. If I go the Brodix, then I can use the copper, so I can get a higher compression, but if I get the Darts I'm going to have to use a composite.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
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From: Unreconstructed, South Carolina
Also must be kept away from any chamfer.
Wally knows all about this but the uninitiated may not've learned ... it's typical (when machine shop reconditions block for overhaul) to have a slight chamfer cut into the edge of top of bore . So ... a block that's bored to 4.030 may have a chamfer with od about 4.060. Safe bet that minimum bore of either 10105117 & 14096405 is 4.100" ... safe bet either will work for 350 overhaul ... even at 4.060 ... I KNOW 10105117 worked on race motor w/ 4.040 bore with chamfer. Same goes for Victor 5746 ... seems these guys sell em: http://www.cnc-motorsports.com/produ...08&CtgID=20320
Last edited by jackson; Oct 18, 2008 at 04:08 PM.
Le Mans Master
Joined: Jun 2004
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From: Seattle WA
St. Jude Donor '14
This is a published spec for every gasket - note that the gasket bore doesn't exactly match the bore; the most common size is around 4.133 for the "standard" FelPro 350 gasket.
