Info needed: Chevrolet 235 c.i. conversion for CMP

[Grant Bowker]

The question on the front mount is (like so many things) a little more complex than it may seem at first glance. Yes, Hanno's engine has the plate with the lower edge flange for mounting the CMP style rubber mount. I can't see if it is punched with the two square holes for the carriage bolts that hold the rubber mount in place. As long as the flange is there, it would be possible to drill and file holes for the bolts and have a functionally identical mount to the CMP mount.
For the style cylinder head shown, the CMP oil filter mount isn't a direct bolt-on. It is possible to make head bolts with an extended hex and threads pointing up to engage the filter mount - weld two bolts head to head (and since my welding was messy but strong, clean up the surplus).
Concerning timing gear lubrication nozzles, there are several styles and I'm quite sure (should confirm...) that there were two different size holes made in the nozzles to allow different oil flows.
For more information on the water pump relocation (using either a CMP pump or one that looks close to the same) to raise the axis of the water pump and fan to be better centered on the radiator, take a look on the Stovebolt forum - it comes up regularly:
https://duckduckgo.com/?sites=stoveb...er+pump&ia=web is their website search for "water pump"
https://www.stovebolt.com/ubbthreads...elocation.html
https://www.stovebolt.com/ubbthreads...ater-pump.html

[Bob Carriere]

You need to make sure the various pulleys you use are all the same width for the belt to run properly. Sometimes you need to find a wide pulley groove on a 216 Harmonic balancer to match the wide pulley of the pump and generator.

Is this for a cab 11/12......... if so as Grant pointed out the 54 dizzy is too big and the whole dizzy assembly needs to be changed.....Pertronix now makes a magnetic device to eleminate the points and condenser witihareal hot spark. On a cab 13 the larger 235 dizzy should fit...... using the 216 harmonic balancer and a 216 water pump pulley will insure the pump does not turn to fast and induce cavitation.

One more thing the water pump will usually have on the rh side an outlet./intake location that should be fitted with a by-pass pipe.....rubber is easy but the 180 degree ebnd will eventually crack.....better to install a 1/2 inch flexible copper pipe soldered to threaded brass fittings.

My experience has been to buy an adapter plate that once fitted allows to use a rebuilt 216 water pump with the two holes at the back.....it does require to drill into the engine block water jacket and tape but relatively easy if the engine is on a stand.

If you need pictures for my set up let me know....

Cheers

[Bob Carriere]

..... would be nice to retro fit a 216 valve cover and a new thick corkgasket.....

Kits containing the necessary longbolts and acorn nuts a readily available....

From my memory....some 1954 and only 54 trucks valve cover had slits cut on the top for air intake for the PCV or draft tube.... and will allow dust/dirt to enter the engine. They can be brazed shut from the inside but then you will need to install a small 216 oil bath air intake filter on the valve cover as per a CMP 216 valve cover..... or the engine crank case will develop a vacuum.

[Bob Carriere]

I enlarged the photo and the holes are visible....all you need is a rubber mount

[Dave Newcomb]

4 different cyl heads available;
3836848 79.1 cc's 58-62 years
5913 86.2
6850 86.2
3703570 92.5 cc's combustion chamber
From Inliners International Club [Chev engine experts in USA]
Dave in Oregon

[Hanno Spoelstra]

Thanks again for the load of info. It’s clear many conversions of this sort have been done. Relocating filters and swapping pump and pulleys etc. sound all very doable. I have a donor 216 with RHD bell housing which could be swapped over.

As this engine is already fully rebuilt it would be worth doing these conversion jobs. I’ll try to get some more photos and have a look at the engine in person.

[Bob Carriere]

That explains why the XXXX848 heads have higher compression and the best to have.......

...and shaving the heads on the Chev engines is almost impossible and better to true up and shave the block surface.....

Thanks Dave


Bob C