Vortec valve question.
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Joined: Jun 2014
Posts: 393
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From: Montana
Car: 1986 Trans AM WS6
Engine: 383 Vortec TPI, PUTS SMILES ON FACE
Transmission: PATC LVL 3 Raptor Transmission
Axle/Gears: 3.27 POSI 9 BOLT
Vortec valve question.
So i have all new components for my vortec head, my question is, can i just replace the valves or will i need to get grinding compound to renew the seat or will i be ok to just replace the valves and move on to the next.
Joined: Mar 2017
Posts: 4,255
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From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: Vortec valve question.
Well it depends on the condition but ideally you should have a machine shop do a 3 or 5 angle grind on them. Lapping them in is generally a poor substitute for a real valve grind and won't hold up over time.
GD
GD
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Member
Joined: Jun 2014
Posts: 393
Likes: 2
From: Montana
Car: 1986 Trans AM WS6
Engine: 383 Vortec TPI, PUTS SMILES ON FACE
Transmission: PATC LVL 3 Raptor Transmission
Axle/Gears: 3.27 POSI 9 BOLT
Re: Vortec valve question.
The condition of the heads are good but was wondering if i could just slap new valves in it.
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Joined: Aug 2010
Posts: 478
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From: Las Vegas
Car: Fourth Gen '94 camaro
Engine: 350 Gen II
Transmission: A4
Axle/Gears: 3.23
Re: Vortec valve question.
Lapping is not a substitute for cutting valves seats. Freshen up a valve & seat already ground correctly yes lapping will restore or improve a valve and seat grind. Now to make things more confusing the newer valve cutting machines are so accurate many shops will install newly cut valves in any order and overlook small leakage. But a good cylinder head rebuild will include leak checking the valves.
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