Bristol Cars - Owners and Enthusiasts Forum  

Go Back   Bristol Cars - Owners and Enthusiasts Forum > Bristol Forums > 6 cyl Bristol cars

6 cyl Bristol cars Type 400 to Type 406

Head Identification

Reply
 
Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 01-04-20, 01:15 PM
Member
 
Join Date: Sep 2011
Location: Pensford Near Bristol
Posts: 5
Default Head Identification

Hi
Does anyone have a definitive list to be able to identify a cylinder head?
Thanks
Reply With Quote
  #2 (permalink)  
Old 01-04-20, 09:18 PM
Member
 
Join Date: Jul 2008
Location: Sydney, Australia
Posts: 324
Default

Derek 328 ,
I should be able to identify the type of Bristol head by the number stamped on two raised bosses on the inlet side , close to the bottom face ,towards the front and rear.

Pls advise that number or post a few photos .

I have made a list of most of the 6 cylinder engines produced ,listed by engine number and chassis number of the car it was originally fitted to .

Geoff
Reply With Quote
  #3 (permalink)  
Old 01-04-20, 11:13 PM
Member
 
Join Date: Sep 2011
Location: Pensford Near Bristol
Posts: 5
Default

Hi Geoff Thanks for the quick response.
I don't have a head but I want to get one.
As I understand it the 100 is the one to go to if possible.
I would like to know how to recognise an appropriate head and it might be useful for other members.

During my search I have spotted numbers like

N321941
N322040

3227
2266

and dates like
22 6 54
8 6 53
Reply With Quote
  #4 (permalink)  
Old 02-04-20, 04:15 AM
Member
 
Join Date: Jul 2008
Location: Sydney, Australia
Posts: 324
Default

Derek 328 ,

There are a few different heads

400 with 85A engine N322030
85C engine N322030 with tube inserted into centre throat to
block balance tube , also some fitted to early 401

401 all with 85C engine N322040

The stamped engine number of these 85 engines/heads are between 1001
and 2292

The 100/110 series heads have larger diameter inlet ports & inlet valves

403 with 100A & AB2 engine N322080 with # 3000 - 3300
404 with 100B &C engine N322690 with #3501 - 3634
405 with 100B2 engine N322080 with #3700 - 3838 & 4001 - 4341
406 with 110 engine 110-1-2002 with #5001 - 5204

Pls note there are some variations in the detail above and often there are large gaps in the engine numbering system.
There are also heads fitted to Bristol Sports engines 100D,100D2, FNS & BS

What car / engine will you be fitting one to , ans what type of use will you give it ??
I noticed you have a Frazer Nash BMW 327 , I suggest any 85 series head would be more suited to that engine than the 100 series head. But if you want it for an engine that can rev as high as 6000rpm a 100 series head might be more suitable .

I have had 85 series engines/heads that will go to 6000 rpm with minor porting and slightly larger inlet valves (depending on cam,compression and carburation). The smaller diameter inlet ports increase the air speed and mid range torque.

When inspecting a head check for corrosion around the water transfer holes and the amount of previous machining of the bottom face of the head .
My recommendation is to buy the one in the best condition .

Good luck in your search.

Geoff
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


All times are GMT. The time now is 09:46 AM.


This is the live site

Search Engine Friendly URLs by vBSEO 3.6.0 PL2