Each header is cutsom fit to the specific engine and includes flexible connector and tie straps.




/.10 size are 7/32" less/ - /.20 size are 1/16" less/
/.90-3.2 are 1/16" more/ - /3.0-up are 1/8" more/

Engine(s) Fitted Price Stock #
  standardlongex-long marine
.10-.15 Engines
O.S. .10 FSR, .10-.15 FP&LA,
K&B .18
MDS .18 FS Pro
Thunder Tiger GP .10-.15
24.95 2040 2041 2042 2043
.20-.36 Engines
MVVS .20 27.95 2260 2261 2262 2263
Irvine .20 2270 2271 2272 2273
O.S. .20-.25 FP & LA
Magnum .21-.28 GP
Thunder Tiger GP .25
S.T.G. .34 (bolt-through)
2300 2301 2302 2303
O.P.S. 3.5 (.21)
Norvel .25 BB
2310 2311 2312 2313
O.S. .21-.32 FS & SX
Enya .21CX & SS30
Evolution .36 NT
Jett .25-.30
Magnum .25-.28 Pro
MDS .28-38 FS Pro
Thunder Tiger Pro .25-.36
Webra .25-.36 Speed
2340 2341 2342 2343
S.T.S. .21-.34K (bolt on) 2360 2361 2362 2363
.35-.46 Engines
Enya .40 X & CX
O.P.S. .40
28.95 2420 2421 2422 2423
Enya .40 SS 2430 2431 2432 2433
H.B. .40
Jett .40-.50 (not the 40L)
2490 2491 2492 2493
K & B .40 (bolt through) 2530 2531 2532 2533
K & B .45 Sportster & .48 2540 2541 2542 2543
MVVS .40 2550 2551 2552 2553
O.S. .40-.45 FSR
ASP .40
Fox .45, & .50 BBRC
Irvine .40
2580 2581 2582 2583
O.S..40-.46 FX,SF
O.S..46-.55 AX, .50 SX
ASP .46
Evolution .40NT & .46NT & Trainer A
GMS 2000 .40 & .47
MDS .40-.48 FS Pro
Mecoa .40-.46
Royal .46
Tower .46
Thunder Tiger Pro .40-.46
2590 2591 2592 2593
Rossi .40 & .45
Powerhouse .40-.45
2600 2601 2602 2603
S.T. GS .40-.45-.51
Como .40-.51
Jett .40L (bolt through)
2620 2621 2622 2623
S.T.S. .40-.45
Como .40-.45 (bolt on)
2630 2631 2632 2633
Webra .40-.55 Speed
(bolt through)
2640 2641 2642 2643
O.S. .40-.46 FP&LA,
Magnum .40-.44GP
ThunderTiger GP .42 & .46
Webra .40 RC (non-Speed)
2650 2651 2652 2653
Webra .40 Speed (old strap) 2660 2661 2662 2663
YS .45 SF 2670 2671 2672 2673
.50-.61 Engines
Enya.45-.50SS & .50CX 29.95 2710 2711 2712 2713
H.P. .61
Webra .61 Speed (old strap)
2730 2731 2732 2733
Fox .60 Eagle III
Irvine .61
2750 2751 2752 2753
H.B. .61
K & B .61
Jett .60 L
Webra .61 BH
2770 2771 2772 2773
K & B .65 Sportster 2780 2781 2782 2783
Kraft .61
RJLK .61
Y.S. .61 long
2800 2801 2802 2803
Moki .60 2810 2811 2812 2813
MDS .58 FS Pro 2820 2821 2822 2823
O.S. .50 FSR & .61 FSR
ASP .61
Enya 60X
MVVS .61-.77
Webra .61-.70 Speed (bolt on)
2850 2851 2852 2853
O.S. .61 FX & SF, .75 AX
O.S. .60 FP & LA(bolt through)
Evolution .61 NT
Jett .76 L
Magnum .61 Pro
MDS .68-.78 FS Pro
ThunderTiger GP & Pro .61
2860 2861 2862 2863
Rossi .61 & .61
Powerhouse .60
2870 2871 2872 2873
Tower .61 & .75 2890 2891 2892 2893
S.T.G. .60, S. .61-.75
Jett .65 (not the .60L)
Como .61-.75 (bolt through)
2900 2901 2902 2903
S.T.S. .61 K, .75 K (bolt on) 2920 2921 2922 2923
Y.S. .60 (non long-stroke) 2930 2931 2932 2933
Also see Special Application Headers



Engine(s) Fitted Price Stock #
  standardlongex-long marine
.90-1.20 Engines
O.S. .90-1.08 FSR (old three bolt) 35.95 2940 2941 2942 2943
S.T. G 90 (bolt through)
Jett .90-1.00 L
2970 2971 2972 2973
O.S. 91 FX,SX&SZ 2980 2981 2982 2983
O.S. 120 AX 2990 2991 2992 2993
1.2-1.5 Engines
Irvine 120-150 40.95 4050 4051 4052 n/a
ASP 120
Evolution 100 NT
Magnum XL 120
4070 4071 4072 n/a
S.T. G 2300 4090 4091 4092 n/a
Thunder Tiger 120 Pro 4100 4101 4102 n/a
Webra 120
Bully 1.2 PR
GMS 120
Mark 135
MVVS 215
UAV 120
4130 4131 4132 n/a
Zenoah G-20,G-23,G-26
Homelite 25
4150 4151 4152 n/a
1.5-3.2 Engines
Evolution 26cc
MVVS 1.6
46.95 4220 4221 4222 n/a
Moki 1.5-1.8-2.1
Mark 1.5-1.8-2.1
4230 4231 4232 n/a
S.D. 2.0
Brison 2.4
4270 4271 4272 n/a
S.D. 2.6-3.2 ci 4280 4281 4282 n/a
S.T.S. 2000,2500,3000,3250 4300 4301 4302 n/a
O.S. 3500, 160
S.T.S. 4500
4310 4311 4312 n/a
3 W 35cc & 70-80cc Twin 4360 4361 4362 n/a
ZDZ 40 (2.4) 4380 4381 4382 n/a
Zenoah 445 Twin & GT-80 4400 4401 4402 n/a
Zenoah G-45 4420 4421 4422 n/a
3.0-4.8 Engines
(flex connector not included)
Quadra 52cc 52.95 4460 4461 4462 N/A
S.D. 3.7 - 4.2
Brison 4.2
4480 4481 4482 N/A
3 W 60cc & 120cc Twin
B.D. 5.1 Twin
ZDZ 50 (3.0)
4520 4521 4522 N/A
Zenoah Q G-62 4560 4561 4562 N/A
NEW!! Also see Special Application Headers


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Macs Products
7935A Carlton Rd.
Sacramento, CA 95826