Hello there!

 

I was looking to bore and to lace the valve's on the header cams, wondered or a doner could be found from another model or if there is anyone who sells such a kit in the UK?

 

 

Many thanks!!

 

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bore and to REPlace the valve's (sorry!)

 

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Maybe I should say bore out a furather 2 mm and replace the valves to fit.

From what I understand you'd be better porting the heads first. You can purchase oversized valves from the US. Have a read of this, it may help;

https://www.300zx.co.uk/forums/showthread.php?181898-Oversize-Valves-options-and-opinions

Yeah it's all being done at once. I'm currently polishing up the intakes on the headers and removing the valves, then it's going to a shop to be ported. Didn't know you could port the intakes on the heads though. How do they manoeuvre the porting tool through the curved shape of the header intakes?

 

Many thanks

Looked into it and it seems bigger isn't better. Looking at deshrouding the valve seats now, is that something we cand do on the VG?

OK gonna go it as I got a couple of spare heads. I'll let you know how the dremmel gets on.

Looked into it and it seems bigger isn't better. Looking at deshrouding the valve seats now, is that something we cand do on the VG?

 

Did you read the link I posted?

Did you read the link I posted?

 

yeah i did thank you, that was some technical info there! Decided against new ground oversize valves, going to take them to a shop to be machined and get the heads skimmed. I was thinking an adjustment to the cams would be a better option, however i did take some material away that was shrouding the 4 valves in the centre of the piston, where the main bolt includes over the area where the flow passes into/out of the valve seats.

 

I put 20 hrs into polishing the headers and the joining mid section. You can now see your face in them. Going to take the plenum to get polished inside and out. Getting it chromed too. lots of work going to the enginr rebuild. new, treated pistons, con rods, timing belt, treated valves, harder springs along with machined cams (for higher lift), gaskets, hx40/35s (not sure yet) intercoolers, ducting, port and polish, 555 injectors, intercoolers, boost controler, and remap courtesy of Horsham Dev, 3" custom exhaust straight through, powerflow tips, custom test pipes, and downpipes, UD pulleys, auto clutch,flywheel skim and reduce, Dual intake and rad and oil cooler. Replacing the main and rod bearings and having the crank checked for balance, ARP main and head bolts, main coolant gallery clearin, timing replacement, and AC and EGR delete.

 

Its a lot of work but worth it, ive easily put the cost of the car back into it and with all that being done, itll be defo worth it.

 

with all things being said, whet do you reckon the rwbhp will be? Im looking for 450 but i figure it could be considerably more.

 

Also is there anything to safeguard the engine i have missed?

 

Obviously im not running stock brakes and suspension, thinking about the 350z upgrade and new bushes all round, BTW its a TT conversion, so no Hicas, better driveshaft, and diff ratio! :)

 

Thanks for the reply Sthphen you seem yto know a lot of things about the Z, where abouts are you based?

 

Tom

https://ibb.co/ebr5pk

https://ibb.co/dMBS25

https://ibb.co/hEDwvQ

https://ibb.co/mNu3aQ

 

Body work above, valve clearance below:

 

https://ibb.co/k9XyaQ

PS Upgraded fuel rail.

Oh and I was thinking about having a custom wide intake plenum built? but was worried about flow to the cylinders being even?