The V8 Owners Forum -

That looks good, though. Are those larger funnels? The thermostat should open at 82°C. The P38's only opens at 88°C, which is too high and bad for the engine. Does the engine have T-liners? Hi bud! Yep, the inlet was enlarged to 45mm, port matched to the cnc Terminator heads. Top hat liners, pocket...

FBW wrote: ↑Mon Jul 07, 2025 8:27 pm Oh yes, about the expansion tank. My description referred to the typical Land Rover tank. The Volvo one certainly works the same way. The inlet here is only from the bottom.


Greetings
Frank

Cheers Frank!

Regards.

Leigh.

The thermostat housing and inlet manifold base.

Hi guys. Thank you for your replies. I'm running a Volvo 760 expansion tank with an E46 M3 radiator and the standard heater matrix in my Vauxhall Viva HC. The gems 4.6 had the thermostat in the inlet manifold... it may have been in another vehicle before I stripped it for rebuild. It is definitely a...

I'm not entirely sure, but I think the P38 has a smaller hose vulcanized onto the inlet hose that leads from the radiator to the water pump. This is the return line for the heater/heater valve. The line to the heater core comes out of the rear intake manifold. The heater control valve should be a 3...

Is there a reason you can't stick to the GEMS layout? On my Land Rover, I faithfully reproduced the OEM cooling system layout (from a P38 Range Rover), and have had no problems with engine cooling whatsoever. Chris. Hi Chris! My problem is the bmw rad has larger inlet & outlet to which I have m...

The water pump rotates in the opposite direction to the crank. Here's a pic of the rear of the front cover. Cheers. Leigh.

Hi Scudderfish! It only has the radiator connection. It may be possible to add fittings to either It or the front cover. Cheers. Leigh.

Hi everyone. I'm looking for information on how to simplify the cooling system in my '74 Vauxhall Viva fitted with a Gems 4.6 V8. Can anyone help? It has an E46 bimmer radiator, a Volvo 760 single outlet header tank with small return & a standard heater matrix with an inline shut off valve. Any ...

scudderfish wrote: ↑Tue Jul 01, 2025 2:04 pm Also, where in the world are you? I assume somewhere in the UK.....

North East Jockland!!!

scudderfish wrote: ↑Tue Jul 01, 2025 2:02 pm Looks like TVR-esque exhaust routing.

Hi! Yep, it was the only way to get downpipes that wouldn't be a pain!!

Cheers. Leigh.

Hi Ian! Forgot to mention the axle is 6 linked. Cheers. Leigh.

Hi Ian! Madhouse you say? Just how I like it!! It should be a riot! Narrowed Mk5 Cortina Atlas, 3:44 cwp, rebuilt Capri 280 ZF lsd, Escort gp2 bearing housings, Quaife en30b 2 piece halfshafts with blank drive flanges drilled to 4" pcd Mk3 escort discs, Cossie calipers & custom Gaz coilover...

Hi everyone! Thank you for accepting my request to join the forum! I am currently in tha latter stages of the build on my '74 Vauxhall Viva HC whic my wife named "Valerie". Cheers. Leigh.