There is a bit more to it than just the tach drive, included is a worm gear that is bolted into the Cam. This means the cam from your Coupe motor needs to be installed. The cam box is the same except for different bolt pattern between the Sedan cover and the Coupe cover. So you can use the same valve cover which is currently on the Sedan motor if you use the same cam box. The distributor housing at the opposite end if the cam is the same for either engine, although it has been pointed out to me that when using a tach drive capable cam in a cam box not intended for that purpose a ticker gasket has to be used under the distributor. This allows a greater gap between the first lobe of the cam and the distributor housing bearing.
But, lets review some of the issues your dealing with. First is the Sedan engine a 15 or 10 engine?
Your Coupe engine is a 25 variant. The 5 at the second position of the number means that it is a full synchro transmission. What this means is that a full synchro transmission uses two overdrive gears, 3rd and 4th. Where as the 10 transmission (constant type) only has 4th as an overdrive gear. There may also be a difference in the exhaust header pipes and the pipe extending to the muffler. Some of the earlier 10 engines connect differently. You may have to change out the exhaust system so it will bolt up to your Coupe exhaust system. If your going to use the Sedan motor and place it on the subframe for your Coupe you will have to use the rear engine mount from the Coupe as the bolts to the subframe are in a different positioned from that on a Sedan.
However the biggest difference is the engine numbers themselves. The red plate on your Coupe is for that car, keeping it the same is a real + when it comes time to complete your restoration or you take it to DMV and they ask to see the paper work on the car.
Yes, I too have only been asked to point out the engine number once in all the cars I have taken to the DMV, but it could have been more cars and more questions.
I hope this helps clear up some of the questions.
Bill
> ----- Original Message -----
> From:
> jason
> hambelton
> To:
> 2cylinderhondas@yahoogroups.com
> Sent:
> Monday, November 04, 2002 10:44
> PM
> Subject:
> Re: [2cylinderhondas] Re: Clean
> up time
> Ok, so if I read this right, I would need to change over the cam housing > between the two so I could use the tach?
> Jason
> > Yes,Ian,the rest is the same,the bolt pattern on the Z- > cam-cover > is different,so you can,t use a Z- cover on a sedan cam-housing
> unless you "tap the extra holes.(A beautiful machine,from the
> past,which is my present!"
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