New Aluminum head pictures.

feadam (5/19/2010)

do these heads have the manifold heat passage in them

The heads are cast as being heat passage capable but unless ordered otherwise, they will be blocked internally. If wanting a working heat passage then when ordering the heads, just let John know that you’d like that passage opened up and made functional.

Seems to be a lot of discussion around the heat passages. Heat passages are not necessary except in colder weather and specifically during warmup to prevent carb icing. Most driving situations do not require the heat passage and the lack thereof can actually prevent some percolation and carburetor heat issues that are the result of the heat passage. Many of the new Edelbrock heads come without the heat passage and most air gap styles of intakes also do not have heat passages. All racing heads come without heat passage provisions as the exhaust flow numbers are more easily controlled by not having an additional hole in the exhaust port. For Texas weather, heat passages are typically blocked so not having them in the heads or intakes simply eliminates having to block them off.

Lorena, Texas (South of Waco)

Author	Message
shadowman	Posted 14 Years Ago
Hitting on all eight cylinders Group: Forum Members Last Active: 10 Years Ago Posts: 9, Visits: 192	Here are a few more pics of the new aluminum Y-block heads. Attachments Geoff's pictures 182.jpg (581 views, 82.00 KB) Geoff's pictures 192.jpg (550 views, 76.00 KB) Geoff's pictures 188.jpg (490 views, 80.00 KB)
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shadowman	Posted 14 Years Ago
Hitting on all eight cylinders Group: Forum Members Last Active: 10 Years Ago Posts: 9, Visits: 192	A few more. Attachments Geoff's pictures 184.jpg (486 views, 96.00 KB) Geoff's pictures 181.jpg (483 views, 81.00 KB) Geoff's pictures 191.jpg (487 views, 68.00 KB)
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feadam	Posted 14 Years Ago
Hitting on all eight cylinders Group: Forum Members Last Active: 10 Years Ago Posts: 11, Visits: 104	do these heads have the manifold heat passage in them
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aussiebill	Posted 14 Years Ago
Supercharged Group: Forum Members Last Active: 4 Years Ago Posts: 1.8K, Visits: 11.4K	feadam (5/19/2010) do these heads have the manifold heat passage in them Sure looks like it. AussieBill YYYY Forever Y Block YYYY Down Under, Australia
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Ted	Posted 14 Years Ago
Co-Administrator Group: Administrators Last Active: Today @ 3:12:25 AM Posts: 7.3K, Visits: 204.6K	Here are some additional pictures. Lorena, Texas (South of Waco)
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Ted	Posted 14 Years Ago
Co-Administrator Group: Administrators Last Active: Today @ 3:12:25 AM Posts: 7.3K, Visits: 204.6K	feadam (5/19/2010) do these heads have the manifold heat passage in them The heads are cast as being heat passage capable but unless ordered otherwise, they will be blocked internally. If wanting a working heat passage then when ordering the heads, just let John know that you’d like that passage opened up and made functional. Seems to be a lot of discussion around the heat passages. Heat passages are not necessary except in colder weather and specifically during warmup to prevent carb icing. Most driving situations do not require the heat passage and the lack thereof can actually prevent some percolation and carburetor heat issues that are the result of the heat passage. Many of the new Edelbrock heads come without the heat passage and most air gap styles of intakes also do not have heat passages. All racing heads come without heat passage provisions as the exhaust flow numbers are more easily controlled by not having an additional hole in the exhaust port. For Texas weather, heat passages are typically blocked so not having them in the heads or intakes simply eliminates having to block them off. Lorena, Texas (South of Waco)
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New Aluminum head pictures.

New Aluminum head pictures.

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