Valve job? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

KrazyZenki · 11-01-2005, 02:09 AM

Im getting my head built(cams, gears, springs, RAS, port n polish) and what I want to know is the 5 angle valve job neccessary or is just a 3 angle valve job ok? Is either one even neccessary? What are the gains and losses if any? I thought I rememeber a thread a while back saying the 5 angle valve job isnt good on the SR20 motors.

ledzeppelin240 · 11-02-2005, 11:38 PM

Don't beleive what you read everywhere. Unless you are puting in some undercut/oversized valves there is no point to a 5 angle valve seat grind.

KrazyZenki · 11-03-2005, 08:17 AM

Thanks alot Led Zepplin. Another other opinions on it. Im staying with stock valves so it sounds like no need for 5 angle is a 3 even neccessary with stock valves?

sncs14 · 11-03-2005, 09:38 PM

i used to work at an automotive machine shop and when we did a regular valve job we almost always did a three angle. 30-45-60 grind. not for performance but rather to make a better seat with the valve and have a smooth flow. then agian some shops cut corners and only do a 45 deg. grind. i personally don't think it will really make that big of a difference between a three and five angle job. if you need/want that much flow get bigger valves then get a five angle.

Romeyo07 · 11-04-2005, 07:19 AM

valve jobs are like 35 bux anyway. It's not a "better safe than sorry" scenario, but I say do it for the price and whatever gain you might get out of it.

11-01-2005, 02:09 AM	#1
KrazyZenki Zilvia Member Join Date: Aug 2005 Location: Las Vegas/Georgia Posts: 163 Trader Rating: (1) Feedback Score: 1 reviews	Valve job? Im getting my head built(cams, gears, springs, RAS, port n polish) and what I want to know is the 5 angle valve job neccessary or is just a 3 angle valve job ok? Is either one even neccessary? What are the gains and losses if any? I thought I rememeber a thread a while back saying the 5 angle valve job isnt good on the SR20 motors.

11-02-2005, 11:38 PM	#2
ledzeppelin240 Zilvia Addict Join Date: Sep 2003 Location: Sinse Posts: 688 Trader Rating: (0) Feedback Score: 0 reviews	Don't beleive what you read everywhere. Unless you are puting in some undercut/oversized valves there is no point to a 5 angle valve seat grind. __________________ Anyway, no drug, not even alcohol, causes the fundamental ills of society. If we're looking for the source of our troubles, we shouldn't test people for drugs, we should test them for stupidity, ignorance, greed and love of power. Looking for: JDM S13 OEM Sideskirts

11-04-2005, 07:19 AM	#5
Romeyo07 Zilvia Member Join Date: Aug 2004 Location: Woodstock, GA Age: 43 Posts: 297 Trader Rating: (0) Feedback Score: 0 reviews	valve jobs are like 35 bux anyway. It's not a "better safe than sorry" scenario, but I say do it for the price and whatever gain you might get out of it. __________________

11-03-2005, 08:17 AM	#3
KrazyZenki Zilvia Member Join Date: Aug 2005 Location: Las Vegas/Georgia Posts: 163 Trader Rating: (1) Feedback Score: 1 reviews	Thanks alot Led Zepplin. Another other opinions on it. Im staying with stock valves so it sounds like no need for 5 angle is a 3 even neccessary with stock valves?

11-03-2005, 09:38 PM	#4
sncs14 Zilvia FREAK! Join Date: May 2005 Location: Las Vegas Age: 42 Posts: 1,003 Trader Rating: (1) Rides Gallery: sncs14 Feedback Score: 1 reviews	i used to work at an automotive machine shop and when we did a regular valve job we almost always did a three angle. 30-45-60 grind. not for performance but rather to make a better seat with the valve and have a smooth flow. then agian some shops cut corners and only do a 45 deg. grind. i personally don't think it will really make that big of a difference between a three and five angle job. if you need/want that much flow get bigger valves then get a five angle.