SKU: 33688861047

PRP 1/2 Inch Head and OEM Head Dowels - Nissan RB

Sale price$74.53 Regular price$82.81
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Ships within 48 hours · Estimated delivery Aug 8 - Aug 13

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Description

PRP 1/2 Inch Head and OEM Head Dowels - Nissan RB1 2 inch head dowels Anyone fitting half inch head studs to an RB (should be all rb25 and 30 blocks) They suit OEM replacement also. Need these! We have recently discovered that many people dont use dowels when converting to 1 2 inch head studs, they are absolutely crucial to stop the head from walking around and hurting your gasket seal! The reason you cant run an RB26 type M12 12 mm Stud in an RB20, 25, or 30 is because they are originally 11mm

1/2 inch head dowels

Anyone fitting half inch head studs to an RB (should be all rb25 and 30 blocks)  They suit OEM replacement also.

Need these!

We have recently discovered that many people don’t use dowels when converting to 1/2 inch head studs, they are absolutely crucial to stop the head from walking around and hurting your gasket seal!

The reason you can’t run an RB26 type M12 / 12 mm Stud in an RB20, 25, or 30 is because they are originally 11mm thread, And if you drill it out and tap half-inch UNC you need around .7 mm per side of the material to tap through to form a reliable thread.

End result with 12mm thread is that you end up with roughly .4mm at best, threads do pull being grey cast, then you have to pull your whole engine down again and fix the problem but once you have gone and pulled the stud thread through, you have to go to 9/16 which is too big or helicoil/ threadsert.

We see it happen all the time so please don’t risk it and just go a 1/2 inch stud, use these dowels problem solved.

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Exchange/Return Notes
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SKU: 33688861047

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Simi Mach
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★★★★★ 5
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Reviewed in the United States on November 4, 2025
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Brogan
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★★★★★ 5
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Reviewed in the United States on June 22, 2025
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Midwest buyer
Bozeman, US
★★★★★ 4
Holds the phone very securely
A little on the expensive side but it really holds the phone well. Much better than the vent clamp I was using.
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Reviewed in the United States on June 1, 2026
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Amazon Customer
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Reviewed in the United States on June 29, 2025
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Casual Surfer
Chelsea, US
★★★★★ 5
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Color: for Kia Carnival 2022-2024, Color: for Kia Carnival 2022-2024
The designer of this van made it difficult to find a good solution for phone mount. I tried 4 different mounts until this, and it's perfect. The only problem is the holder itself- it's kinda crappy. The good news is that the mount uses standard sized ball joints so I took an old magnetic mount and mated to this, perfect phone mount.
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Reviewed in the United States on December 9, 2023

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