B20 cylinder head re furb'

arcturus · Jan 1st, 2018, 10:48

Hi and a happy new year to y'all.
If I decide to have hardened valve seats fitted to the head will it be just the exhaust or will it be the inlet's as well? I take it that I will also need new valves and guides.

classicswede · Jan 1st, 2018, 12:23

You only need to do the exhaust side. On B20's you can do both inlet and exhaust but B18's will break through into waterways on the linlet side.

I use bronze guides as they are better suited to running unleaded, valve guide wear is more of an issue than VSR

arcturus · Jan 1st, 2018, 13:28

If I decide to go down the replacement polished port, head route, where would the best place to go and roughly how much would I expect to pay?

classicswede · Jan 1st, 2018, 20:26

I can do them.

You looking at exhaust seats, bronze guides, new inlet and new exhaust valves?

The above is simple enough to price

You can polish the combustion chambers but not a good idea to do the ports. Are you just thinking a fairly basic porting job or are there other mods that need to be supported?

blueosprey90 · Jan 1st, 2018, 21:44

Arcturus,

I don't know anything about porting a B20 head, but I've studied the question for my MGA. If you are considering either a DIY or a professional port job on your head, you might want to take a look at this article by David Vizard.

You may also be able to find a multi-part seminar on youtube that he gave maybe 15 or 20 years ago that has some good information. Search by his name.

Seems like the best bank for the buck may be to do some porting immediately behind the valves.

https://grassrootsmotorsports.com/ar...aign=GRMWeekly

Here's another interesting article on testing the head's ability to flow air.

http://www.diyporting.com/thread.html

arcturus · Jan 2nd, 2018, 08:58

Quote:

Originally Posted by classicswede

I can do them.

You looking at exhaust seats, bronze guides, new inlet and new exhaust valves?

The above is simple enough to price

You can polish the combustion chambers but not a good idea to do the ports. Are you just thinking a fairly basic porting job or are there other mods that need to be supported?

It's the shipping that kills me!

classicswede · Jan 3rd, 2018, 23:22

I send to Portugal fairly often. It is a fair bit more expensive than spain

arcturus · Jan 4th, 2018, 09:06

Any idea of the weight of a B20 cylinder head?

Jan 1st, 2018, 10:48	#1
arcturus arcturus Last Online: Apr 10th, 2024 08:21 Join Date: Mar 2006 Location: Sagres Portugal	B20 cylinder head re furb' Hi and a happy new year to y'all. If I decide to have hardened valve seats fitted to the head will it be just the exhaust or will it be the inlet's as well? I take it that I will also need new valves and guides. __________________ life's too short to drink bad wine

Jan 1st, 2018, 12:23	#2
classicswede Trader Volvo in my veins Last Online: Today 17:58 Join Date: Dec 2004 Location: Anglesey	You only need to do the exhaust side. On B20's you can do both inlet and exhaust but B18's will break through into waterways on the linlet side. I use bronze guides as they are better suited to running unleaded, valve guide wear is more of an issue than VSR __________________ http://www.classicswede.org www.classicswede.co.uk

Jan 1st, 2018, 13:28	#3
arcturus arcturus Last Online: Apr 10th, 2024 08:21 Join Date: Mar 2006 Location: Sagres Portugal	If I decide to go down the replacement polished port, head route, where would the best place to go and roughly how much would I expect to pay? __________________ life's too short to drink bad wine

Jan 1st, 2018, 20:26	#4
classicswede Trader Volvo in my veins Last Online: Today 17:58 Join Date: Dec 2004 Location: Anglesey	I can do them. You looking at exhaust seats, bronze guides, new inlet and new exhaust valves? The above is simple enough to price You can polish the combustion chambers but not a good idea to do the ports. Are you just thinking a fairly basic porting job or are there other mods that need to be supported? __________________ http://www.classicswede.org www.classicswede.co.uk

Jan 3rd, 2018, 23:22	#7
classicswede Trader Volvo in my veins Last Online: Today 17:58 Join Date: Dec 2004 Location: Anglesey	I send to Portugal fairly often. It is a fair bit more expensive than spain __________________ http://www.classicswede.org www.classicswede.co.uk

Jan 1st, 2018, 21:44	#5
blueosprey90 Master Member Last Online: Today 19:09 Join Date: May 2017 Location: New Milford, Connecticut	Arcturus, I don't know anything about porting a B20 head, but I've studied the question for my MGA. If you are considering either a DIY or a professional port job on your head, you might want to take a look at this article by David Vizard. You may also be able to find a multi-part seminar on youtube that he gave maybe 15 or 20 years ago that has some good information. Search by his name. Seems like the best bank for the buck may be to do some porting immediately behind the valves. https://grassrootsmotorsports.com/ar...aign=GRMWeekly Here's another interesting article on testing the head's ability to flow air. http://www.diyporting.com/thread.html

Jan 4th, 2018, 09:06	#8
arcturus arcturus Last Online: Apr 10th, 2024 08:21 Join Date: Mar 2006 Location: Sagres Portugal	Any idea of the weight of a B20 cylinder head? __________________ life's too short to drink bad wine

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