Crossflow head info required please

Hey guys I have a 1.8 8v lump in my golf on twin 40 webbers and I have just purchased a crossflow head for it. The reason for the head change was due to the exhaust heat starting to affect the carbs! I have been told that there are a few mods which have to be made to the new head e.g. Oil gallery??? That's all the info I have been given by the seller?!?! Just wondering if anyone can enlighten me more on what mods are required and (if poss) how to do them. Any help would be much much appreciated! Thanks guys

Which type of crossflow head do you have….with or without swirl ports?

I've done a lot of development on these heads lately, in fact it's still ongoing. They work very well out of the box, a fair bit better than a std type head in terms of flow…they are almost as good as a ported std valve GTi head, so you'll have a power gain to start with as well as bringing the carbs away from the heat of the exhaust manifold. The come up well too when ported, even on the std valve size.

However, if you fit a heat shield between the two manifolds at the back you wont have a problem with the current set up…I've run race cars like that for years without an issue, and they're fine on the road too when theres a lot of heat build up & very little moving/cooling air.

The crossflow head is a good step forward though… you'll need a different inlet manifold as the angle and shape is totally different to yr current set up…I'm in the middle of developing one of those too for DCOE type fitment.

Are you planning on running it on a std 1800 block?

Jm racing thankyou for the reply. Yes I am running the head on my1.8 block. I am in pursuit of an inlet manifold and all the cooling system parts e.g. Longer hoses and housing on the side of the block! Any more info would be great. Thanks

The oil return hole need modifying/welding up to suit the earlier blocks like the 1800. If you look at this pic, the return hole to the left of the big central hole is the one that needs welding. Currently it'll have the slot shape in the head face like this one…



…you need to have it welded to replicate the original style of return hole to match your block so it looks like this…



Use the MLS (multi layer steel) type gasket if it's going to be a high compression engine, or a good quality fibre type gasket from Elring or Victor Reinz will do a good job if it's a road engine.

I'll be looking into the inlet manifold fairly soon on a customers project engine, so that will be available early in the new year.