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Message: <blockquote data-quote="hattech-v" data-source="post: 1327128" data-attributes="member: 5700">maybe someone here can share what is the spec for head job such as pnp size details, how much power gain from the head job etc etc....rumors said here in malaysia pnp job is depen on ur luck. sometime can be good n somtime vice versa.shiro, i dun think b16a can be stroked to 2L coz of the block height limitation.u can try the calculation on the stroker by using the following formula...3.142 * (piston size/10/2)^2 * (stroke size/10) * number of cylinder = ccgeneral info (bore x stroke) - (please correct me if wrong)1. B16A (81mm x 77.4mm)2. B16B (81mm x 77.4mm)3. B18C (81mm x 87.2mm)4. B20B (84mm x 90mm) - someone said 89mm - anyone can confirm? here oso some sample on the cc calculation by oversizing the piston or making the cc bigger by stroker kit.B16A (81mm piston with original stroke 77.4mm)----------------------------------------------------3.142 * (81/10/2)^2 * (77.4/10) * 4 = 1595ccB16A (81mm piston with stroker 1.8 87.2mm) - i'm not sure whether this is possible or not.----------------------------------------------------3.142 * (81/10/2)^2 * (87.2/10) * 4 = 1797ccB16A (oversize piston 83mm with original stroke 77.4mm)----------------------------------------------------3.142 * (83/10/2)^2 * (77.4/10) * 4 = 1675ccB16A (oversize piston 83mm with 1.8 stroker 87.2mm) - again not sure wether its possible or not.----------------------------------------------------3.142 * (83/10/2)^2 * (87.2/10) * 4 = 1887ccB16B/B18C (original piston 81mm with 2L stroker (B20B) 90mm) - someone said 2L stroke size is 89mm----------------------------------------------------3.142 * (81/10/2)^2 * (90/10) * 4 = 1885ccB16B/B18C (original piston 81mm with aftermarket 2L stroker kit 97mm)----------------------------------------------------3.142 * (81/10/2)^2 * (90/10) * 4 = 1999ccB20B (oversize piston 85mm with original stroke 90mm)----------------------------------------------------3.142 * (85/10/2)^2 * (90/10) * 4 = 2043cc</blockquote>

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