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

[Robarabian]

I will PM you.. we should talk.

I have a similar setup. a CIS 2.7. The CIS would have been an option for you, but if it has been sitting for 10 years, you are looking at a significant investment to get it going again. You will likely need to completely have the WUR rebuilt, the fuel distributor rebuilt; all new fuel lines and injectors. It adds up.

You can send the webers out to be rebuilt for about the same cost as just buying new ones from Redline. They are quality built and run well. I rebuilt all the CIS items, and really still wasn't happy with it so I put webers on. DOn't overthink the port shapes, you are not a race car driver. The car drives well, idles smooth and does what it should with the round port manifolds and the CIS heads. It really doesn't care IMHO.

I also fabricated a Holley Sniper EFI to the car, and it works well too. It is cheaper than new webers but you need to be able to do some fabrication.

Simple "re-sealing" of the motor is a misnomer. Main seal, front seal and cam cover gaskets... Maybe that will keep it from leaking, but you have oil return tubes O Rings and the Nose Bearing.. all of these seals could have dried up, you won't know until it starts. Oil return tube o rings can be done without removing cam towers if you have the collapsible tubes. #8, the motor has to come apart.

If I were you, I would source new webers, new front seal, Main seal, Oil return tubes and cam cover gaskets, along with a fresh valve adjustment while it is out. New V belt and slap it in the car. The reason I say get new carbs is the cost is the same and wont take 3-6 months for someone to rebuild right. Even then corrosion can be in all kinds of places a rebuilder cant get to, even ultrasonically cleaning etc... the corrosion is the problem on the very tiny fuel galleys. Not that it "Can't" be done, just isn't efficient and you may open pandoras box anyway.

Don't forget a fresh throw out bearing, clutch plate and disk and surfaced flywheel. Source an oil tank from Ben on this site. He has lines to go with it.

Reach out to me from my PM and we can talk, I have been there / done this with my 6 conversion.

Robert

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

[rick 918-S]

At one time I had some adapters made that blocked the notch in the heads for the injectors. I called them Alien adaptors. This allowed the use of early intakes and avoided the expense of purchasing PMO stuff. I offered them around and only sold a few sets. I don't think I have any left. Really, the CIS stuff is very easy. The cam in the engine is spec'd to injection also. If you still have the CIS you should use it.