[ROVERNET - UK] 3500s head compatibility

peter king peter at king-co.com
Sat Feb 18 15:25:24 GMT 2006


I'm using an SD1 block. What is the benefit of the newer type heads?


On Feb 18, 2006, at 12:34 AM, Kent Kinard wrote:

> Hi Peter (and anyone else contemplating a rebuild of a P6B engine)
> You can have the heads for the cost of shipping.  I will never use  
> them since I prefer the later two types, but it will be at least  
> three weeks before I can ship.
> General suggestions:
> Use an SD1 block or have the early block and crank machined to take  
> the SD1 type rear crank seal.  There are similar lip type seals  
> available to convert the P6B front cover.  I have done this on  
> Buick 300 V8 covers.
> Use 9.35:1 pistons and run regular unleaded gas.  Install the cam  
> bearings as per Des Hammill's instructions ( I'll send them to you  
> you if you don't want to buy the book)and oil restrictors in the  
> passage that feeds the rocker shafts.  This has been common Buick  
> V6 practice for twenty years and it makes using a larger oil pump  
> unnecessary on the street.  But,there can be NO wear in the oil  
> pump cavity or on the gears.
> Use the later Range Rover Cam (to '95).  It has the same lift and  
> duration as the P6B cam but is slightly advanced. Use a true roller  
> timing set.  Install hardened valve seats.
> Don't even think about using a block until you have checked the  
> main caps for fretting.  If you can lift off the main caps with the  
> bolts out they probably aren't properly registering in the block  
> and the block is therefore junk.  After you are sure the main caps  
> still register properly in the block make your final assembly using  
> studs instead of bolts.
> There has been a lot of discussion about head bolts, studs and  
> stretch bolts.  Torquing steel bolts into aluminum castings invites  
> stripped or pulled threads.  I use studs on the heads and studs are  
> a must on two-bolt mains. Milodon makes head studs, main studs and  
> true roller timing sets.
> I've pontificated enough.
> Roverly,
> Kent K.
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