Convert back to D Jet Fuel Injection-, Engine # GC Options

[young55961]

I am currently stuck while installing the intake runners onto the cylinder heads.

My engine number starts with "GC," so I believe it is a 2.0L engine. However, the cylinder heads have a 4-bolt intake pattern.

I suspect a previous owner may have swapped the cylinder heads when converting the engine to dual carburetors.

Can I simply look for 4-bolt intake runners to match these heads, or is there an adapter available that would allow me to use the 2.0L intake runners?

From what I have seen, the original 3-bolt 2.0L cylinder heads are rare and expensive.

Has anyone run into this situation before? Any suggestions would be appreciated.

Thanks,
Billy

[Jack Standz]

Can I simply look for 4-bolt intake runners to match these heads, or is there an adapter available that would allow me to use the 2.0L intake runners?

From what I have seen, the original 3-bolt 2.0L cylinder heads are rare and expensive.

Yes, 4-bolt intake runners can be had, but the inside diameter of the runners may be smaller than the 3-bolt 2 liter ones, so measure them (if that matters to you). Also, measure the ports on your heads to consider how to possibly match the cylinder head ports to the intakes or vice-versa.

You can always drill two holes in the mounting flanges of your current 2 liter intake runners (some might hyperventilate at this suggestion (IMG:style_emoticons/default/biggrin.gif) ).

Original 2 liter cylinder heads are "sort of rare" (we have at least three sets on the shelf, but haven't figured out what we will do with them). But, the bigger problem is that they're 50 years old and probably cracked, worn out, hardly anyone works on them anymore, etc. New 2 liter style heads are available from AA Pistons and AMC with the three studs. Also expensive, especially if you have them worked on/modified (and even more especially if you get the fancy awesome ones from places like LN Engineering).

BTW, any 914 motor/case can be used to build a new motor of 1.7 to at least 3 liters. A GC case or any other case tells you nothing about what size motor is inside. It may have started as a 2 liter, but that doesn't help identify what it is now. However, it's unlikely someone took a 2 liter and made it a 1.7 or 1.8 liter, but it is possible.

[Jack Standz]

One more thing. If you originally had a 2 liter motor and have replaced it with a motor with 4 stud cylinder heads, where are your spark plugs located?

Lots of 4 stud cylinder heads have the 1.7/1.8 spark plug hole locations that are in a different location than the 2 liter cylinder heads. If this is the case, it will affect performance and you will need the correct tin.

[young55961]

Can I simply look for 4-bolt intake runners to match these heads, or is there an adapter available that would allow me to use the 2.0L intake runners?

From what I have seen, the original 3-bolt 2.0L cylinder heads are rare and expensive.

Yes, 4-bolt intake runners can be had, but the inside diameter of the runners may be smaller than the 3-bolt 2 liter ones, so measure them (if that matters to you). Also, measure the ports on your heads to consider how to possibly match the cylinder head ports to the intakes or vice-versa.

You can always drill two holes in the mounting flanges of your current intake runners (some might hyperventilate at this suggestion (IMG:style_emoticons/default/biggrin.gif) ).

Original 2 liter cylinder heads are "sort of rare" (we have at least three sets on the shelf, but haven't figured out what we will do with them). But, the bigger problem is that they're 50 years old and probably cracked, worn out, hardly anyone works on them anymore, etc. New 2 liter style heads are available from AA Pistons and AMC with the three studs. Also expensive, especially if you have them worked on/modified (and even more especially if you get the fancy awesome ones from places like LN Engineering).

BTW, any 914 motor/case can be used to build a new motor of 1.7 to at least 3 liters. A GC case or any other case tells you nothing about what size motor is inside. It may have started as a 2 liter, but that doesn't help identify what it is now. However, it's unlikely someone took a 2 liter and made it a 1.7 or 1.8 liter, but it is possible.

Yes, I measured them and they are the same size. I decided to drill the holes to match the intake ports. I really don't want to spend any significant money on this setup. I'd rather wait and save enough money to buy a kit from Dubshop.