Headers wont fit

Frode,

I believe Larry's headers are a 2V port pattern, (which would also fit on std. 4V heads as bolt holes are the same).

However, I think I'm right in saying the CHI 3V (at least the 225 and 258CC versions) have 0.4" raised exhaust ports and a relocated bolt pattern, so I'm guessing matched headers would be required.

The 185cc 3V head has the standard loctaion, so check which ones you have.

Julian

Hello Julian
The heads are 3V 218 cc. The headers fit to the heads, and where used at the dyno.
The problem is the space, or lack of, at left side of the engine. My gas tank has a type of heat shield, and the space between this and the engine is cramped. I am unable of "squeezing" the headers into position. The stock engine and headers was tight, but fit.
Frode

I have had three different sets of headers on my 73.
All needed "clearancing" on at least one tube to clear the heat shield.

In order to clearance them you will require a clearancer. It is also know as a hammer here in the states.

Flatten the arc of the tube until it clears the cover.

So if I understand you right you cant get the header in position to even see if it fits. Have you tried installing from the top of engine bay?

I remember having some problems with that side as well with my installtion. I did get them on but cant remember if it was from the top or bottom. I running a Windsor so its not quite the same

The headers are ceramic coated, so the "massage" with hammer treatment would damage them.
Have tried to get them in place both from the top and from below. Maybe if I lift the engine and install before dropping it back in place would be the best sollution.

If you can't lower the bridge, raise the river.

Clearance is clearance. Dimple the gas tank heat shield.

I have the same heads. I installed the same headers that I had on the original motor without an issue.
Give Larry Stock a call tomorrow. That sucks if you have to pull the motor for header clearance.
What type of numbers did you get on the dyno with those heads?
Will

I have e.mailed Larry, and are waiting for his reply.
As for the performance, I have posted the whole dyno sheet under the topic rev kit/valve float.
Max torque 515 lb/ft at 5000 rpm
Max hp 540 at 5700 rpm
max rpm 6300. Need a rev kit, and adjustment to my Holley 950 Commander "Box".
Frode

I too have an early pushbutton and have minimal clearance on that left (also PPC) header, but with stock heads.

I would suggest that whatever solution you find, consider using the copper header gaskets if it's going to be difficult to get clearance to replace header gaskets (which I'm already having to do on that side). It's good that yours is already dyno-tuned, though, so you'll be less likely to blow them (true also for the coating blistering, which I've also done).

FOUND THE WAY TO GO !!!
After one sleepless night, I decided to lift out the engine, put the left side header in position, and then reinstall the engine.
Headers are now in place. They hit the heat shield, but are in place.
So my experience is :
First the headers, then the engine !

I have stock 4v heads and the headers touch the stainless steel gas tank shield. Previous queries to the forum said this was common and not to worry. Still though you've got to wonder if pre-heating the gas is good for the milage! I'd like a gap there for a better heat and sound barrier.