A Series cylinder heads stainless steel rimflo valves

With an extensive shop devoted very much towards cylinder head work APT can offer maximum performance heads either for full race or a mildly hotted up road car.
The internal combustion engine, and the power it will produce, hinges around how much air (oxygen) can fill the cylinder.
Sure you can fit 'bigger' cams, carbs and so on, but at the end of the day, if the head does not flow you are fighting a loosing battle.

The part numbers below cover all 'A' Series engine sizes and any casting either for small bore or 1275 engine sizes.
Each head is modified to the customers requirements. This means we sit down and discuss exactly what is required, how it will be matched to its use and take care of coming up with the compression ratio that will work the best and to suit the octane available.
Heads are normally available outright rather than exchange if that would suit you better.

The thing to keep in mind is that even if you are not building a full race engine we still advise that you get the very best flowing (not the one with the biggest ports!) head that will fit in with your budget.

If the head flows well, then cam, compression ratio, exhaust header/system, induction can all be on the 'moderate' side and you will have a very nice running engine that performs reliably through a wide power band.

Part Number	Description	Pkg'd	Price US $
CHA-01......	A-Series Big Valve Cyl. Head Performance Road Use - Outright	EA	$1,554.00
CHA-01EX....	A-Series Big Valve Cyl. Head Performance Road Use - Exch.	EA	$1,428.00
CHA-02......	A-Series Full Race Cyl. Head To Customer Requirements Out.	EA	$1,595.00
CHA-02EX....	A-Series Full Race Cyl. Head To Customer Requirements Exch	EA	$1,592.00

Part Number	Description	Pkg'd	Price US $
SV300-1.....	Intake Valve 1.093" For 948 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-10....	Intake Valve 1.468" For 1275 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-2.....	Intake Valve 1.159" For 948 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-3.....	Intake Valve 1.218" For 948 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-4.....	Intake Valve 1.250" For 948 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-50....	Exhaust Valve 1.003" For 948 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-51....	Exhaust Valve 1.06" For 948 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-52....	Exhaust Valve 1.151" For 1275 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-53....	Exhaust Valve 1.212" For 1275 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-6.....	Intake Valve 1.312" For 1275 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-7.....	Intake Valve 1.401" For 1275 'A' - Rimflo Stainless Steel	EA	$36.88
SV300-8.....	Intake Valve 1.440" For 1275 'A' - Rimflo Stainless Steel	EA	$36.88

Part Number	Description	Pkg'd	Price US $
V103........	Intake Valve 1.401" For Cooper S - Stainless Steel	EA	$31.95
V104C.......	Exhaust Valve 1.22" For Cooper S - Stainless Steel	EA	$31.59
V105........	Intake Valve 1.401" For 1275 'A' - Stainless Steel	EA	$31.59
V108........	1275 SS1.25" "A" Exhaust Valve	EA	$31.95
V118........	Intake Valve 1.48" For 1275 'A' - Stainless Steel	EA	$31.59
V119	1275 Stainless Steel 1.44" intake valve 'A' series	EA	$31.59
V121........	Intake Valve 1.312" For 948 'A' - Stainless Steel	EA	$31.95
V122........	Exhaust Valve 1.060" For 948 'A' - Stainless Steel	EA	$31.95
V126........	1275 SS 1.31" "A" Intake Valve	EA	$31.95
V127........	Exhaust Valve 1.22" For 1275 'A' - Stainless Steel	EA	$31.95
V128........	Exhaust Valve 1.151" For 1275 'A' - Stainless Steel	EA	$31.95

Part Number	Description	Pkg'd	Price US $
APT-01A.....	Bronze Intake Guide For 'A' Series Performance (Use special Teflon Seal, Part Number 5-07210)	EA	$5.99
APT-02A.....	Bronze Exhaust Guide For 'A' Series Performance (Do not normally use any seal, but will accept stock seal)	EA	$5.99
AS22+2......	Bronze Valve Guide For 'A' Series 948 +.002	EA	$5.99
AS22........	Bronze Valve Guide For 'A' Series 948 std. O.D.	EA	$5.99
AS25+2......	Bronze Valve Guide For 'A' Series 1275 +.002 on OD, in/ex	EA	$5.99
AS25........	Bronze Valve Guide For 'A' Series 1275 std. O.D.	EA	$5.99
	For a more complete list of Manganese Bronze valve guides in many sizes for different applications, see under heading: Other/Cylinder Heads

Part Number	Description	Pkg'd	Price US $
5-07210.....	Teflon Valve Seal For APT-01A & TR54 Guides	EA	$2.70
ASS.........	'A' Series Standard Valve Stem Seals	EA	$2.39
	For a more complete list of Teflon "Positive Seal" Type seals for other valve and guide sizes, see under heading: Other/Cylinder Heads

Part Number	Description	Pkg'd	Price US $
08711221....	Valve Seat Insert - 0.87" ID, 1.12" OD, .219" H	EA	$5.75
09311821....	Valve Seat Insert - 0.93" ID, 1.18" OD, .219" H	EA	$5.75
09311825....	Valve Seat Insert - 0.93" ID, 1.18" OD, .250" H	EA	$5.75
10012521+10.	Valve Seat Insert - 1.00" ID, 1.26" OD, .219" H	EA	$5.75
10012521....	Valve Seat Insert - 1.00" ID, 1.25" OD, .219" H	EA	$5.75
10012525....	Valve Seat Insert - 1.00" ID, 1.25" OD, .250" H	EA	$5.75
10013121....	Valve Seat Insert - 1.00" ID, 1.31" OD, .219" H	EA	$5.75
11213721....	Valve Seat Insert - 1.12" ID, 1.37" OD, .219" H	EA	$5.75
11814321....	Valve Seat Insert - 1.18" ID, 1.43" OD, .219" H	EA	$5.75
11815021....	Valve Seat Insert - 1.18" ID, 1.50" OD, .219" H	EA	$5.75
	For a more complete list of the APT hi-heat conductivity valve seat inserts, see under heading: Other/Cylinder Heads

Part Number	Description	Pkg'd	Price US $
BB281.......	7mm 'Dingle Ball' Bore Brush Type Hone For 9/32" Guides	EA	$23.95

A Series Cylinder Heads