728 280 Z valves in a 510

510
North West Datsun Enthusiasts Forum : Datsun : 510
Topic: 280 Z valves in a 510

Author	Message
defdes Enthusiast Joined: 17 May 2003 Location: United States Posts: 849	Topic: 280 Z valves in a 510 Posted: 05 August 2003 at 6:47pm
	Does anyone know the size of the "big valves" from the 280z one uses when building a head for a 510? Is it 45mm 38mm? I'm putting them in a U67 atop a 2.2 block. Tanx alot.
	'72 LZ22 510 '71 L16 510 Vintage CS Racer
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datsunboy Enthusiast Joined: 28 March 2003 Location: New Zealand Posts: 287	Posted: 06 August 2003 at 3:26am
	they are 44mm...stock U67 ones are 42mm ( intake ) and stock U67 exhaust are 35mm....Z car ones are 38mm not sure if you can fit both in....I have only the larger 44mm intake and stock 35mm exhaust valves in my U67....and it doesn't look like much room between them.....might work though
	http://geocities.com/datsun510power
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Hainz Guru Joined: 03 December 2002 Posts: 3122	Posted: 06 August 2003 at 8:53am
	I thought the exhaust was 35mm for the later Z cars and 30mm for the 240s But Top End Performance has stainess steel ones for sale at 14$ apc. Probably Manley valves.
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Racerx Novice Joined: 29 July 2003 Posts: 33	Posted: 06 August 2003 at 9:45am
	*Originally posted by defdes* Does anyone know the size of the "big valves" from the 280z one uses when building a head for a 510? Is it 45mm 38mm? I'm putting them in a U67 atop a 2.2 block. Tanx alot. This is what I did take the 280z intake vales and use them for the intake on your head then take L16 intake vales and us them for the exguast vales it will work because that what I have in my u67 and in two of my A87
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Bleach Guru Joined: 04 December 2002 Location: United States Posts: 4806	Posted: 06 August 2003 at 9:59am
	After the valves are ready, do you guys take the head to have a professional fit in a new valve seat and grind out the runners? It sounds like a harder job than just porting.
	Ratsun.net
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defdes Enthusiast Joined: 17 May 2003 Location: United States Posts: 849	Posted: 06 August 2003 at 10:07am
	What are the "runners"???? Once the new valve seats were put in, I thought it was just a matter of blending the bowls to meet the larger valve seat size.
	'72 LZ22 510 '71 L16 510 Vintage CS Racer
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datsunboy Enthusiast Joined: 28 March 2003 Location: New Zealand Posts: 287	Posted: 06 August 2003 at 5:12pm
	I just bought the valves...and took them and the head to the shop....and got them to fit them and give it a mild pocket port
	http://geocities.com/datsun510power
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defdes Enthusiast Joined: 17 May 2003 Location: United States Posts: 849	Posted: 06 August 2003 at 5:16pm
	Datsunboy, you used the 44mm & 38mm? In what kind of head?
	'72 LZ22 510 '71 L16 510 Vintage CS Racer
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datsunboy Enthusiast Joined: 28 March 2003 Location: New Zealand Posts: 287	Posted: 06 August 2003 at 6:39pm
	no...I just used 44mm and 35mm....in a U67 open chambered head
	http://geocities.com/datsun510power
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defdes Enthusiast Joined: 17 May 2003 Location: United States Posts: 849	Posted: 06 August 2003 at 8:38pm
	Sorry, dur I didn't realize that was your initial post. Yeah, thats the same head Im trying to build up, it doesnt look like there is alot of room to support those 38mm exhausts. I'd like to hear if someone has done done it successfully b4 I go and order the parts. Thanks for your replies.
	'72 LZ22 510 '71 L16 510 Vintage CS Racer
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Bleach Guru Joined: 04 December 2002 Location: United States Posts: 4806	Posted: 07 August 2003 at 8:46am
	...maybe if you sink both valves back into the head you would have room, but then your valve length will be all wrong. You'd have to shim up the springs... but then you could shave the head and shim up the cam towers too! Oh, that seems like a lot of work just for a couple mm larger on the exhaust ports. Just buy a 280Z! oh well, whatever... Nevermind
	Ratsun.net
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