ive got a block fully 420a im going to be boosted running high psi what do i need to do as far as head work other than new valve guide seals im getting the valves swain coated should i get new vavles and springs or will stock hold fine should i off set grind the valve seats what do people with 420a s do with their heads

This might be advanced to you, but uh.. (insert something rude here).

Moved to perf/eng

Originally posted by ESI2TSI
ive got a block fully 420a im going to be boosted running high psi what do i need to do as far as head work other than new valve guide seals im getting the valves swain coated should i get new vavles and springs or will stock hold fine should i off set grind the valve seats what do people with 420a s do with their heads

I've never seen a valve guide go bad in a 420A head, just replace the valve stem seals.

What you can do to your head depends on your pocketbook. I would go with a least a street port. If you are looking to push a lot of boost, and run her at the track I would go with a race port. You can concider that for the street as well, the high rpm range will really flow then. I would also concider cams. They are a good investment. In which case you should send the extra money and upgrade the valve springs. If you are going to be spendign a lot of time in the high rpm range or plan on raising you rev limit. The Ti retainers are nice for lowering rotational mass in the valvetrain.

When doing head work make sure whoever you take it knows what they are doing and knows you are going turbo. We do different port/polish jobs depending on NA or turbo applications, just slightly different tricks for each application.

As you can see all this works add up by the time you do all teh little things. But that's not saying you can't spend less and still be better off.



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