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Old 11-26-2018, 06:52 PM
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Some pics of the progress
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Old 11-26-2018, 08:03 PM
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My stock head with ap2 retainers was pretty good to me. Valve failure happened on 30psi. I guess thats my fault for running 30psi on a stock head. Haha
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Old 11-26-2018, 09:55 PM
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The thing with the head is there are different levels of failure. Valve failure being most extreme but theres 15% 10% 5% 1% cylinder leakage, just because an engine isn't 'blown' doesnt mean its good.
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Old 11-27-2018, 04:08 PM
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Are oem valves coated or is this how burned valves looks like?
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Old 11-27-2018, 05:02 PM
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those valves don't look burned the exhaust side is quite consistent

here's what mine looked like. notice the big difference
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Old 11-27-2018, 05:07 PM
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Are oem valves coated? It looks like the coat or paint gets chipped off?
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Old 11-27-2018, 05:17 PM
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They are not that is built up carbon
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Old 11-28-2018, 12:38 PM
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valve failure is pretty rare and when it does happen its always on the exhaust side. I personally run super tech .5mm oversized super tech inconel exhast valves, bronze valve guides, super tech titanium retainers and duel springs all with stock oem intake valves. Valve job and work done by tom at port flow.
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Old 11-28-2018, 05:59 PM
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Looks like im going to be the guinea pig, I went with 4Piston Racing. Port and Polish head, Manganese Bronze valve guides, Ferrea S101000 spring kit, Ferrea Retainers, Ferrea competition plus oem size super alloy valves, and cnc open the combustiom chamber. Will post up the flowchart when i get it back.
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Old 11-28-2018, 06:18 PM
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Ferrea is quality and 4P does good work, you'll be fine just less rich.
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