Modifying Firewall For Rear Cylinder Head Oil Return

[the_tonkau]

Hi All,

In my R33 Gtst I have an RB25/30 and I'm going to need to massage the firewall a little to fit the rear cylinder head oil drain fitting that I am using. Has anyone done this before that can share their experiences? Is there much behind the firewall in this position keeping in mind with the 3litre block its a 25mm or so higher than standard?. Its positioned in the rear top welsh plug spot that sits between the cams. (see sample pic)

Everyone's thoughts are welcome.

Cheers

Steve

[Craved]

hammer

only real option without taking the dash out completely to section the area and weld in a new piece. You cant introduce too much heat either as there is the firewall insulation on the inside.

[the_tonkau]

hammer

only real option without taking the dash out completely to section the area and weld in a new piece. You cant introduce too much heat either as there is the firewall insulation on the inside.

Thanks

Yeah, thats the plan as it stands, but I suppose I trying to find out how much room I can make before I damage whatever is behind it.....

[Craved]

you will probably have less than an inch - just cant recall

have a look for the heater core DIY threads, should have pics of dash out as the only bits in that area is the heater/blower box

[the_tonkau]

you will probably have less than an inch - just cant recall

have a look for the heater core DIY threads, should have pics of dash out as the only bits in that area is the heater/blower box

Thanks again, will look them up! I know I saved them as I need to do the heater solenoid when I can get the time. Shame your not in Melb, I have a fair bit of powder coating to be down once I finish installing the engine and redo all the ic pipes. I also need the cam covers done.

Cheers

[Craved]

there is always AUSpost if you cant get what you need locally

Biggest thing to what for is the mounting points for the heater units, there are a couple of mounts up there, but i cant recall exactly where.

[the_tonkau]

there is always AUSpost if you cant get what you need locally

Biggest thing to what for is the mounting points for the heater units, there are a couple of mounts up there, but i cant recall exactly where.

Ah, thats the pic. Thanks

Anyone else "massaged" their firewall?

[bubba]

I have, with a hammer.

[boz_soljah]

i used a crowbar and just kept smacking from the engine bay, it worked for me, but took time