I just purchased a offy 2x1 intake for a 218 in a 1950 plymouth. I went to install and there seems to be a clearance issue with the firewall. The question I have is do you have to modify the firewall to fit the intake or am I missing something
i havent jacked with one but i have never heard of anyone cutting on the firewall to get it to fit how close is it, in my 51 that think would have to be huge to get even close to the firewall.
Mine in my 48 is not close to the firewall either. This may be a stupid question, but you didn't by chance get an intake for the 25 inch long block did you?
There are two Mopar flatheads - measure the head length. From the late 1930s on, Chrysler, DeSoto, and all Canadian cars used the 25" motor, while US Dodge and Plymouth used the 23" motor. (I don't know about trucks). Quite a few motor swaps done on these cars over the years; 25" motors in US Dodge/Plymouth is not a hard swap (basically just reverse the radiator mounting) and not uncommon. Someone who has both motors will need to measure the distance between the intake ports for you, or just do it yourself. But it should not hit the firerwall if you have the right parts. The 25" motor speed equipment is harder to find these days
I have a 23" block If I measure from the center of the last intake it is 2" to the firewall The offy intake looks like it would be almost touching if I could get it over the studs which I can not. Do the three lower studs that hold on the intake need to be taken off or can they be taken off to install? Does anyone have a picture of this setup for me to look at for clearance
Here is a picture of my Offy. Are you having clearance issues with the intake or the exhaust? Your picture shows a rear dump exhaust. They also made exhaust with the dump moved more toward the center like the second picture below. This is one I have from a 53 model Suburban.
the fire wall in the plymouths from 1949 thru 52 are all the same, do you mean fender well if so I can see that with the heater box. but firewall I just done one on a 51 plymouth w/o any problems. your intakes on the inside of the intake/exs system. can you show a pic of your issue in the car ?
the big intake will not even come close to fitting, check your mounts as mine hit also in my 50 and the front mount was shot pulling the motor back, but i still m***aged the firewall a bit as it was still close, so just mark it and when you get the old one off, take a rounded block of wood and a hammer and clearance it a bit, no need to cut it up.
Looks to me like it is the exhaust manifold that is too close to the firewall... There are two types, a rear dump like you have pictured, and one that has the dump between the #5 and #6 cylinders. Below is a couple of pictures to show the difference. These manifolds were split, so they don't have the heat riser... The intake should work on either exhaust manifold, but the rear dump exhaust manifold will just about touch the firewall. You will need to get the other type for your '50. Pete
The intake and exhaust need to come off as a unit. They are bolted together at the heat riser castings. There is no way the intake can interfere withthe fire wall as it is contained within the extremities of the exhaust manifold. Thee are 13 fasteners the affix the manifolds to the block. Three of which are a ***** to get to. If you want to you can open up the center port lower hole intake by cutting the hole into a slot. Then if you choose not to fasten them together at the eshaust heat riser you can mount them seperately. You will need to fashion a blocking plate for the top of the riser if you want them seperate. I fashioned a plae of sheet metal with counter sunkholes and then ground down the top of the screws to clear the intake,
Nope it hits! the problrm is the bend in the firewall where it changes angles it hit right there. look at the third pic in blueskies post right above the exhaust and that is where it hits.
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