I've covered over 5'000 miles in the Westfield this year as Ive been up and down the country to a few shows as well as through Belgium and to Le Mans so I've decided to upgrade the engine over winter, (I get bored easy).

I've been running the car with circa 350 - 400bhp depending on boost but would like a bit more power to propel me into the low 10's even a 9

With the current spec I managed an 11.07 @138 at a RWYB at Elvington on road tyres and I've also manages a few 11.1's at Pod too.



I'm looking to reliably get over 500bhp out the engine when I'm done which should be a breeze with the spec I already have and what I'm planning.

The easy option would be to just slap on a GT30 and have done but I am looking at building a top spec motor with the best of everything.

I'll be using my current inlet system with a larger Jenvey throttle body and changing my head, cams, exhaust manifold and turbo.

I'm also going to run a slightly higher comp ratio than my pervious engine.

It's a bit drastic but I've always wanted to go this route anyhow.

I'll be using a silvertop block mated to an ST170 head with electric water pump setup to get round the belt fouling the waterpump. No NOS at this stage but I may change my mind.

Silvertop bottom ends have larger maincaps which is the reason for going this route.

Here are some pictures of the ST170 head I recently bought.

This will be getting larger valves and a ported by CNC heads over winter.

I'll be taking off the Variable valve timing which is an easy job.

It's worth noting that these heads flow better than the Cosworth head as they were developed by the Special Vehicle Team in America hence the Focus SVT branding in the states.

I've been told these heads are good for well over 700bhp once ported if I wanted to go that mad







I'll update as and when things move along