Head modification
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Joined: Sep 2000
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From: Crestline,OH
Car: 1987 Formula 350
Engine: 6.0 boost and smak
Transmission: 4l80e
Axle/Gears: 9bolt 3.27
Head modification
Has anyone tried or had their alum. aftermarket heads drilled and tapped for center bolt valve covers, when they are perimiter form the factory (trickflow, afr,).... I seen a good deal on a set but I really want center bolts
Joined: Mar 2000
Posts: 43,187
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
You'd have to weld bosses in the middle of the head first.
I'm not seeing it, but hey, it would be original!
I'm not seeing it, but hey, it would be original!
Joined: Jun 2003
Posts: 5,028
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From: Desert
Car: 1991 Z28 Vert
Engine: 383 single plane efi
Transmission: T-56
Axle/Gears: 8.8 with 3.73s
I have seen the kits that allow you to convert a perimeter style valve cover to a center bolt before. I saw the add in "Car Craft." I believe that the cost was $70.
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Depends on the head. I machined a set of AFR's to accept centerbolts (they were perimeter bolt heads), but I wouldnt advise following my path 
If the head wasnt offered by the manufacturer as capable to use both styles, like Brodix, it wont happen unless you do some welding or use the adapters.
If the head wasnt offered by the manufacturer as capable to use both styles, like Brodix, it wont happen unless you do some welding or use the adapters.
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Joined: Apr 2002
Posts: 1,119
Likes: 1
From: Armpit state
Car: 71 Nova
Engine: Superramed 383, Topline heads
Transmission: 700r4
Axle/Gears: 8.2 posi 3.08
Originally Posted by Tibo
I have seen the kits that allow you to convert a perimeter style valve cover to a center bolt before. I saw the add in "Car Craft." I believe that the cost was $70.
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