hardened valve seats ?? - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 3rd, 09, 10:26 PM Thread Starter
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robert
 
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hardened valve seats ??

I had a set of 3890462 head worked at a machine shop new valve gides new stainless valves z28 springs. head are going on 327 in a 1967 camaro . should I have had hardend seats installed ?
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post #2 of 5 (permalink) Old Oct 3rd, 09, 11:47 PM
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Alex Johnson
 
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Re: hardened valve seats ??

Quote:
Originally Posted by rherring View Post
I had a set of 3890462 head worked at a machine shop new valve gides new stainless valves z28 springs. head are going on 327 in a 1967 camaro . should I have had hardend seats installed ?
if they dont have them
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post #3 of 5 (permalink) Old Oct 4th, 09, 01:09 AM
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Ron
 
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Re: hardened valve seats ??

If the engine were to be used for Towing or Marine service such that it is under constant load I would say YES. For Psgr Car Street/Strip service NO. If anything the Hardened Seat Inserts make it almost impossible to achieve the desired Hi-Perf valve cuts and port shape below the Valve.

Z15CAM - There was a Viper in my Rear View
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This was my 70 1/2 Z28

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post #4 of 5 (permalink) Old Oct 4th, 09, 06:20 AM
 
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Re: hardened valve seats ??

Quote:
Originally Posted by Z15CAM View Post
If the engine were to be used for Towing or Marine service such that it is under constant load I would say YES. For Psgr Car Street/Strip service NO. If anything the Hardened Seat Inserts make it almost impossible to achieve the desired Hi-Perf valve cuts and port shape below the Valve.

When there was lead in gas it helped protect the seats in the head, when they removed the lead the factory induction harden the seats. When you do a valve job you cut through this hardness. This can lead to valve seat recession, in some heads it happens faster then others. As far as putting a seat in and not being able to do a HP valve job thats just false you have to pick the correct seat.
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post #5 of 5 (permalink) Old Oct 4th, 09, 11:58 AM
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Steiner
 
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Re: hardened valve seats ??

If you saw what mine looked like before they got rebuilt you'd have them put in. I don't think any of the exhaust valve tips sat at the same height.

'69 Camaro
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
500hp/538lbft

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'69 Camaro Beater-SFT 327-M20-Moser 4.10-sold
'02 Z/28 vert-stock-sold and totaled
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