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Engine building ideas

Old 08-29-2018, 03:04 PM
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This is a very helpful and very detailed list, thank you for putting it together.

Emilio, could you give me your recommendation on valves for my new head? I picked up a stock VVT head with 160k. I am torn whether to do a stock rebuild with multi-angle job or to go for oversized valves. I'm not sure if the valves are worth the $$$ for me. The car is a weekend, sunny-day driver and doesn't see track time and 7200rpm redline. Forged bottom end, ARP studs, etc. Plans are to make less than 300hp, likely in the 270 range. What will valves do for me in terms of spool and how many more PSI would I need to make the same power bump as oversize valves would give? Just blew up another Churbo and looking heavily at a TSE EFR right now.
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Old 08-29-2018, 03:11 PM
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Originally Posted by vitamin j View Post
This is a very helpful and very detailed list, thank you for putting it together.

Emilio, could you give me your recommendation on valves for my new head? I picked up a stock VVT head with 160k. I am torn whether to do a stock rebuild with multi-angle job or to go for oversized valves. I'm not sure if the valves are worth the $$$ for me. The car is a weekend, sunny-day driver and doesn't see track time and 7200rpm redline. Forged bottom end, ARP studs, etc. Plans are to make less than 300hp, likely in the 270 range. What will valves do for me in terms of spool and how many more PSI would I need to make the same power bump as oversize valves would give? Just blew up another Churbo and looking heavily at a TSE EFR right now.
You are making it more complicated that it is. Valves cost more and make a bit more power. If they are in your budget, add them. If they are not in your budget, do not add them.

If you can add boost, then add boost. The equivalency is irrelevant.
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Old 08-29-2018, 03:12 PM
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Didn't Soviet make 450hp on a bone stock head?
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Old 08-29-2018, 03:32 PM
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Simple enough, thank you!
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Old 08-29-2018, 05:39 PM
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Originally Posted by vitamin j View Post
I picked up a stock VVT head with 160k. I am torn whether to do a stock rebuild with multi-angle job or to go for oversized valves. .
Be careful with the multi angle. While retaining stock valve seat width, there is not a lot of room to add a third angle. At least that was how my machine shop felt. I did end up with 3rd, but not much.
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