CYLINDER HEAD

*Unit: ¥(JPY)
*The price does not include tax.

CYLINDER HEAD

Process	Unit	Straight 3	Straight 4	Straight 6	V6	V8	Flat 4	Comment
Cylinder head decking Less than 1.0mm (minimal cut)	One	9,500	12,000	15,000	20,000	24,000	16,000	Cuts are made in 0.1mm increments.
Cylinder head decking 1.0mm or more	One	12,500	15,000	18,000	28,000	32,000	24,000
Combustion chamber specified volume decking	One	14,500	17,000	20,000	30,000	34,000	26,000	Decking to match specified combustion chamber volume.
Valve guide replacement 2v	One	6,000	8,000	12,000	12,000	16,000	–	Valves required. A seat cut is required due to the stem axis changing.
Valve guide replacement 4v	One	12,000	16,000	24,000	24,000	32,000	16,000
Valve guide production 2v	One	28,500	40,000	57,000	57,000	72,000	–	Original production using phosphor bronze. Anti-galling, improves heat dissipation, reduces blow-by, and greatly improves durability.
Valve guide production 4v	One	57,000	72,000	98,000	98,000	130,000	72,000
Genuine valve guide inner/outer diameter processing	One	1,000	1,000	1,000	1,000	1,000	1,000	Make the oversized valve guide the proper dimensions.
Valve guide inner diameter reaming	One	500	500	500	500	500	500
O/S valve guide Boring for valve guide pilot holes	One Section	4,000	4,000	4,000	4,000	4,000	4,000	Proper dimensions to accommodate oversize valve guides.
Valve face polishing	one	850	850	850	850	850	850	Necessary for re-use and seat cutting.
Seat cut (minimal cut)	One Section	2,000	2,000	2,000	2,000	2,000	2,000	Minimal seat cut.
Seat cut (throat matching)	One Section	2,500	2,500	2,500	2,500	2,500	2,500	Set length is also adjusted.
Seat cut (enlarge)	One Section	3,000	3,000	3,000	3,000	3,000	3,000	Seat cut without exchanging the seat ring and match the throat.
Valve stem end cut (minimum polishing)	One	500	500	500	500	500	500	Polishing when the stem end face is damaged.
Valve stem end cut (adjusting polish)	One	800	800	800	800	800	800	Polishing for protrusion adjustment.
Seat ring replacement	One Section	3,000	3,000	3,000	3,000	3,000	3,000	Simple replacement of seat ring. Seat ring sold separately. Insert a seat ring that matches the specified O/S valve.
O/S seat ring replacement / head counterboring	One Section	4,500	4,500	4,500	4,500	4,500	4,500
Seat ring production	One Peace	2,300	2,300	2,300	2,300	2,300	2,300	Can be made with heat-resistant steel and for older lead-free cars.
Seat inner diameter enlargement	One Section	650	650	650	650	650	650	For correcting the protruding step below the seat ring when assembling big valve without port polishing or seat ring replacement.
Valve lapping 2v	One	4,000	5,000	6,500	6,500	8,000	5,000	Compound is used to check for proper seating.
Valve lapping 4v	One	6,500	8,000	10,000	10,000	13,000	8,400
Valve S/P cleaning assembly 2v	One	8,000	10,000	12,000	12,000	14,000	10,000	Assembly of the processed head. Valve stem seals required and sold separately. (Available from NAPREC)
Valve S/P cleaning assembly 4v	One	12,000	14,000	17,000	17,000	20,000	14,000
Shim adjustment 2v	One	18,000	23,000	35,000	35,000	45,000	–	Solid lifter head clearance adjustment. Creating shims of non-genuine spec is also possible. (Shims sold separately)
Shim adjustment 4v	One	30,000	40,000	60,000	60,000	80,000	50,000
Shim production	One Piece	2,000	2,000	2,000	2,000	2,000	2,000	Outer shim from ￥3,200, thickness ± 0.02mm.
Port polishing 2v (Estimated amount)	One	60,000	64,000	76,000	76,000	88,000	–	As it is done by hand, it will take an extended amount of time to complete.
Port polishing 4v (Estimated amount)	One	80,000	88,000	118,000	118,000	154,000	88,000
Plug hole helicert processing	One Section	10,000	10,000	10,000	10,000	10,000	10,000	Repair work when screw threads are crushed.
Porsche twin plug processing	One Section	30,000	30,000	30,000	30,000	30,000	30,000	Mainly for Porsche boxer engines.
Valve stem end cut + Cotter groove cutting	One	3,000	3,000	3,000	3,000	3,000	3,000	When using a valve with a long stem, includes cotter groove cutting.
Valve lightweight processing	One	4,000	4,000	4,000	4,000	4,000	4,000	Cutting unnecessary material from the valve face, reducing the weight and increasing the suction and discharge efficiency.
Valve surface mirror polish	One	3,000	3,000	3,000	3,000	3,000	3,000	It has the effect of reducing carbon adhesion and improving the S/V ratio.
Chromoly valve retainer production	One Piece	3,000~	3,000~	3,000~	3,000~	3,000~	3,000~	Offset dimensions can be specified in addition to genuine dimensions.
Production of titanium valve retainer	One Piece	6,000~	6,000~	6,000~	6,000~	6,000~	6,000~	Offset dimensions can be specified in addition to genuine dimensions.
Flow test	One	100,000	100,000	100,000	100,000	100,000	100,000	Measured using a flow bench tester.
Cam lobe clearance processing 2v	One	16,800	16,800	22,800	22,800	31,200	–	For when internal interference occurs due to enlargement of the high lift camshaft or base circle.
Cam lobe clearance processing 4v	One	31,200	31,200	42,000	42,000	60,000	42,000
Pressure test	One	–	18,000	20,000	–	–	–	Cylinder head water pressure check. Special engines require additional jig production fee.
Combustion chamber squish area repair welding	One cyl	one side 8,000 inside 12,000	one side 8,000 inside 12,000	one side 8,000 inside 12,000	one side 8,000 inside 12,000	one side 8,000 inside 12,000	one side 8,000 inside 12,000	Weld overlay to repair the part damaged by knocking (pent roof type)
Combustion chamber shaping (processed by hand)	One Section	12,000	12,000	12,000	12,000	12,000	12,000	Advanced combustion tuning by changing combustion chamber shape
Nissan L-type head combustion chamber argon weld overlay	One	30,000	30,000	30,000	30,000	30,000	30,000	Overlay of combustion chamber to change shape (0.1mm warpage after welding)