hot street - dirt track

Honda D16A6

I-4cyl 1.6L 16v SOHC

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The original valve springs can handle a high valve lift, however they are very weak and cannot exceed the original rpm limit. For this reason, upgrading to Cat Cams springs is advised

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if required, use extra shims to increase spring load

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double spring PAC-D19864 can also be used on retainers 99351 and 99352(requires dedicated lower retainer and valve seal)

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These camshafts do not have a fuel lobe. To use these camshafts in carburettor engines (like the D14A1), an electrical fuel pump should be used

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Distance between valve and piston should be 1.0mm at least:

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check 5-15° after TDC on intake

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check 5-15° before TDC on exhaust

Machine pistons if required. Wrong installation can cause severe engine damage!

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ONLY for dirt track applications and pro street use with adjustable engine management or carburettors