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Steam Holes In 400 Heads
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djp221
New User
| Posts: 19
| Joined: 11/08
Posted: 11/30/08
08:37 AM
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Do I need to drill all six of the steam holes in my RHS aluminum heads for my 406 or just the bottom three? I was looking at the Edelbrock web site and the installation directions for their sbc heads say to drill the bottom three only 
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GibTG
Moderator
| Posts: 1904
| Joined: 10/03
Posted: 12/01/08
02:56 PM
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You may want to get a hold of Edelbrock and get a reason to why they believe the extra holes are unnecessary.
If I were going to go through the trouble of doing it I would drill them all in hopes to maximize their effect.
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djp221
New User
| Posts: 19
| Joined: 11/08
Posted: 12/01/08
06:35 PM
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For everyone's info the RHS heads have improved water jacket's so the steam holes are not necassary.
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