Jump to content
  • Announcements

    • Vista

      Search Facility

      Please note the existence of the Forum's Advanced Search Facility. It can be accessed from the search menu at the top right of the page, or from the link below   http://www.oldskoolford.co.uk/ipb/index.php?app=core&module=search&search_in=forums
    • Vista

      Forum Update   23/07/17

      Please note that we will shortly be updating the forum's operating software to the latest version. There may be some outages as this process happens and it'll take us a few days to get everything set up in full again. The update is now complete, please bear with us while we sort out all the other stuff that proves necessary after such a big update
Sign in to follow this  
bigbadsquare

1500 pre crossflow engine help.

Recommended Posts

bigbadsquare    89

OK guys I've got a new old stock ford 1500 pre crossflow cylinder head still in the box (not GT). It's marked up as a low compression version (L).

Anybody know what the difference between the low and High compression (H) cylinder head.

Also I'm trying to get some valves for it. Now looking in my Cortina book it shows a standard 1500 inlet valve is bigger than the GT valve. Can this be correct? Anybody be able to give me a definite answer I would be very grateful. Thanks Paul

Share this post


Link to post
Share on other sites
colr6    1,271

It'll be the combustion chamber volume which will larger. If I remember correctly the chamber shape on a GT head is different to a std one plus the cam fitted to GT has a better lift plus breathing through a 28/36 weber and better exhaust manifold all adds up to a few more jee jees

Share this post


Link to post
Share on other sites
BeigeAl    10

OK guys I've got a new old stock ford 1500 pre crossflow cylinder head still in the box (not GT). It's marked up as a low compression version (L).

Anybody know what the difference between the low and High compression (H) cylinder head.

Also I'm trying to get some valves for it. Now looking in my Cortina book it shows a standard 1500 inlet valve is bigger than the GT valve. Can this be correct? Anybody be able to give me a definite answer I would be very grateful. Thanks Paul

I can confirm that 1500gt inlet valves ARE smaller - it was to do with un-shrouding the valves in an effort to get better breathing (valves might be fractionally lighter but not sure how much that helps!)

As already said by Colr6, the combustion chamber would be slightly bigger. You could skim the head to raise compression but depending on what ratio you are after it might be wiser to use a HC head in the 1st place. 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

×