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Message: <blockquote data-quote="mh wong" data-source="post: 1064417967" data-attributes="member: 129572"><p>i was searching n asking around bout 7a, no one tell me 7a is reliable, theres 1 mech in kajang told me if u want turboing later, its better to bore 82mm only, unless, u want to play na, then, u can actually bore it to 83mm. </p><p></p><p>ok, when i ask him how is the reliability, </p><p>he answer me, u cant abuse it the way u drive 4age, if u always hirevving, it tend to break, bcoz, water "hole" r too close to the piston wall. </p><p>2. 7a will tend to burn the engine oil slightly higher compare 4a.</p><p>3. without hicam, it cant rev >8.5k, the power lost after 7k+ rpm.</p><p>4. with 7a, the timing will slightly not accurate.</p><p>5. save fuel compare 4a</p><p>6. 7a flywheel is weak compare 4a flywheel, another drifter told me, they had experienced flywheel broken while drifting. unless you have stroker kit, the crank can use 4a flywheel.</p><p>7. in zth, theres a old timer share his experience, saying that, if u have same performance parts on 4age, it can eat 7age within 400m.</p><p>8. 7afe block is not like 4age, if you r not lucky enough, when you bore it to 83mm, sometime, the block surface have small hole, so, you have to use another block.</p><p></p><p>after gather all the information, im not dare to convert to 7a. just share<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/idea.gif"  class="smilie" loading="lazy" alt=":idea:" title="Idea    :idea:" data-shortname=":idea:" /></p></blockquote><p></p>

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