I am rebuilding a 4k and have been advised to replace my inlet valves.
Thought that these parts would be readily available...how wrong was I!!
I have to get these new style one that have 2 grooves on the shaft for the colletts to slip into, but the excisting ones i have, have only one groove. meaning the colletts wont fit into the new two grooved valves.
To make things even more fun. NO ONE has the colletts needed for the two grooved valves!?!?!?!?!
Can any body help me on this one?? pleaese i am getting desperate, i have a fully built tweaked 4k with sidies that i now cannot finish because of these bloody valves.
*bangs head on desk repeatidly*
Anyone no anything about 4k inlet valves??
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Anyone no anything about 4k inlet valves??
by jock » Thu Jun 16, 2005 3:12 pm
If it doesnt have a motor its not a sport.
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Valves
by GOLDAE86 » Thu Jun 16, 2005 7:03 pm
Try and find some valves that have the same dimensions other than the stem length. You want the stem to be longer so the reconditioner can machine the stem length down to size and groove the stems to take the keepers.Had to do this to an old engine that had the same problem 
To finish first, first you must finish
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by atmosports » Thu Jun 16, 2005 9:55 pm
As above find some new valves that can be shortened & get the keeper groove remachined, usually they have to be ground or spark eroded in there, but it depends on how hard the valves are, I have previosuly machined them with ceramic/cbn tips in a lathe.
Else if no luck then you'll need to get keepers to suit the valves/retainers. This is the hard bit as you may need to supply the keeper groove spacing, groove diameter,valve diameter & the required angle of the keepers. Probably best to try someone like Kelfords/CSL etc who do heaps of cams/heads etc as they'll probably have a listing for something that'd work.
Else if no luck then you'll need to get keepers to suit the valves/retainers. This is the hard bit as you may need to supply the keeper groove spacing, groove diameter,valve diameter & the required angle of the keepers. Probably best to try someone like Kelfords/CSL etc who do heaps of cams/heads etc as they'll probably have a listing for something that'd work.
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Re: Anyone no anything about 4k inlet valves??
by matt dunn » Thu Jun 16, 2005 11:41 pm
Are you using the 3K bigport head as they have a different valve setup to std ones as i found out when i did mine years ago?
Matt
Matt
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Re: Anyone no anything about 4k inlet valves??
by jock » Fri Jun 17, 2005 5:36 pm
matt dunn wrote:Are you using the 3K bigport head as they have a different valve setup to std ones as i found out when i did mine years ago?
Matt
no just ported a stock 4k head and planing that down for compression,
Cheers for the info guys, I think ill go with the suggestions of machining to suit if all else fails
If it doesnt have a motor its not a sport.
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