At a crossroads with my conversion Options

[Cfletch]

Need maybe a little outside perspective. I have a 1970 914 1.7 that has been sitting on jackstands for about 10 years at this stage and is in the middlish of a 6 conversion. I ended up getting a 2.7L out of a 74 911 a while back that was stock and had its CIS installed on it, but needed to be refreshed with new gaskets. There came a point in time where I thought I did not want the CIS because of complexity of the fuel system and sizing of the plenum where I said screw it I'll do carbs instead. I got a set of core italian webers and went to rebuild them only to find out they needed more parts than I had thought. Those are sitting on the work bench in need of the random parts to be back to complete. I never got around to getting intake manifolds because I ran into an issue with the weird 74 CIS port sizing. They are 32mm from my recollection with the cutout in them for the injector. Once I realized that I couldn't just slap a standard intake on it I kind of just stopped in my tracks and with other projects, college, and career stuff taking priority, the car just sat. I eventually talked to the old owner of PMO and he mentioned that I could get away with actually using the MFI manifolds with my webers to circumvent the issues of the intake ports on the heads since the gaskets also have that cutout for the injectors so that was always kind of the option and route I was going. Now back after 10 years, I really want to get the car back on the ground and to drive it. I have a ton of work still left in terms of oil system, axles, intake of course, and engine install and I guess I am here to see what others think as the best direction to take.

Would I be better/smarter to just go back to CIS and deal with the system that I don't really feel comfortable dealing with? Or stick to the webers and the mix and match of the MFI intake manifold?

Additionally I was having some issues back when I was more active on the project to get the engine installed into the car.... Its been on a jack for all this time just waiting to be installed and from my recollection the angle of the car and the angle of the engine were off giving me some issues getting everything lined up in a manor where it could actually be bolted together. I think I generally just need to get back into the project and make progress but am not sure where to spend my time and money on.

Any thoughts or ideas are welcome

[gereed75]

Not sure what an “MFI manifold” is. With MFI throttle bodies bolt right up to cylinder heads.

Carb setup uses manifolds that bolt up to heads, carbs bolt to manifolds. All carb manifolds are basically the same AFAIK (PMO or Weber) except for Zenith manifolds which are unique to Zeniths.

Parts for Webers and Weber linkages are readily available. Refurbishing them is not rocket surgery as long as they are not damaged

Just do it.

[mb911]

Not sure what an “MFI manifold” is. With MFI throttle bodies bolt right up to cylinder heads.

Carb setup uses manifolds that bolt up to heads, carbs bolt to manifolds. All carb manifolds are basically the same AFAIK (PMO or Weber) except for Zenith manifolds which are unique to Zeniths.

Parts for Webers and Weber linkages are readily available. Refurbishing them is not rocket surgery as long as they are not damaged

Just do it.

(IMG:style_emoticons/default/agree.gif) MFI manifolds have the throttle plates in them.


OP speaking from many years of experience sell what you have and use the KISS method and buy a new correct setup. It will darn near a wash. Reach out to me for oil line questions www.914-6werkshop.com