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unfamilia
 Post subject: head query
PostPosted: Sun Feb 09, 2014 11:27 pm 
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Location: straya
Just wondering how and why the open chamber heads such as the u67 are prone to detonation from what i have read on here and other l series forums.

I have an a87 head but looking at options for largernports on a factory u67 or v91 I have in shed.
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Baz
 Post subject: Re: head query
PostPosted: Mon Feb 10, 2014 9:24 pm 
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Location: Lonsdale, South Australia
for a reasonably tuned L series, 38mm ports are big enough.
Open up the A87.

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"R.I.P. Baz. 29 April 2022. Thank you for all your contributions to the Datsun community over the years. You will be missed." - OZDAT
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unfamilia
 Post subject: Re: head query
PostPosted: Mon Feb 10, 2014 9:34 pm 
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Cheers baz I scored a a87 off a mate which has had work.
Shaved 2mm over inlet valves 37mm inlet ports 72wade cam with matching lash pads and heavier springs.

Hoping it will work well with my single 45side draft weber in my l18.

So are u67 and v91 prone to detonation in stock form
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unfamilia
 Post subject: Re: head query
PostPosted: Mon Feb 10, 2014 9:40 pm 
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unfamilia
 Post subject: Re: head query
PostPosted: Mon Feb 10, 2014 9:43 pm 
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unfamilia
 Post subject: Re: head query
PostPosted: Mon Feb 10, 2014 9:44 pm 
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I dont know what fthm means stamped on the head either
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Baz
 Post subject: Re: head query
PostPosted: Mon Feb 10, 2014 9:54 pm 
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F**K this head modifying.

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"R.I.P. Baz. 29 April 2022. Thank you for all your contributions to the Datsun community over the years. You will be missed." - OZDAT
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unfamilia
 Post subject: Re: head query
PostPosted: Mon Feb 10, 2014 10:01 pm 
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Must be one of yours then baz. But trace didnt draw a schlong on it lol
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unfamilia
 Post subject: Re: head query
PostPosted: Sat Feb 15, 2014 1:13 pm 
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Head for sale is 107.5mm from face to wherevrocker cover seals.

Head im using is 106.4mm at same place.
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