I'm putting together a Mercruiser 4 cylinder for a '28 'A' pick-up. I want to build my own intake and headers. I know there have been tech articles on here about doing 4 banger intakes in the past, but of course I can't locate them now. Can anyone send me a link to those posts? I want to build something that'll work with a Rochester 2G and wonder if there is anything I should avoid or that I should be aware of with regards to runner length, height of intake, etc. I just want to drive it, not go 100 MPH. Anybody?
Here's a thread.....similar to your build. http://www.jalopyjournal.com/forum/showthread.php?t=46941&highlight=simple+tech
Thats wild, I just did onefor my AMC4 banger. Came with the usual electronic stuff (junk) so I got some pipe and made a log manifold, set a 2 barrel Rochester on it. Only problem was the dizzy, (no advance system) and those sensors, and computer. So I sent the dizzy to FS Ignitions, they FIXED it so all I have is a coil, mechanical advance, and a pick up. It runs well, and it was cheep. You can do it. Ice man
Well here is two takes on the subject. First pic is the setup I build for the 153 that is in my T right now. Second pic is what I'm doing for the 181 that is going into the T. The damm ports on the 181 are huge compaired to the 153 . So my orignal setup would not come close to working. Cut out a flange from 3/8s material and finished it to size on the mill. 2X3 tubing was a real close match to the intake ports, so thats what I used. The 2 Carter W-1's will be reused on the new setup. I fabed up a port divider to match what the Merc manifold looked like inside. I think just for grins I'm going to make up another manifold that will use the Merc Rochchester 2 BBl. Will be very close to the 2 carb one except a centered flange for the 2 BBl.
Jersey Suede I have intake flanges for the do it yourselfer, In ALUM and in steel. which fit the 2 intake port heads.
Here is a photo of those flanges for the DIY guys who want their own intake systems. These are 3/8 Bullet Alum Plates and I also have them in 3/8s steel.
Do you know that stock they are equiped with a Rochester 2 barrel ( some had rochester 4 barrels ). The intake in surrounded by a large water jacket, which I think could be ground away, leaving the individual runners showing, making it look much better, less bulky. Also, the 4 barrel version had an oil cooler in that shroud. Just FYI, Mark
The info I gave you is for the 3.7 four banger ( half a ford 460 ), not the old Chev II motor and its variations. Mark
dammit , this thread now shows up after i just pulled my 153 and sold it to a friend for his t bucket, oh well guess i'll p*** the info on to him !
Jersey, Is that the engine that uses a Ford 460 p***enger car head? If so you may want to do something like what I did for my six - minus two cylinders, of course. And stainless headers into a megaphone exhaust are always cool - these are going on my vintage champ car: In general I would avoid individual runner (IR) manifolds even though they are easier to fab. They create tuning headaches. Use an individual runner / common plenum approach. Good luck / have fun.
Thats a 153 head ,the 181 Merc head is a whole diff animal has 8 seperate ports. And all the ports are mucho bigger.
I thought the 181 came both ways ? I have a 8 port head and personaly the ports look smaller.The 8 port head does have bigger valves. Just the port opening looks smaller.This head had the Bosses removed for the Bolt-in lump ports.That is what you are seeing in the intake port. But what do i know I'm just a L6 guy LOL I just started playing with some of the L4s
Well Twisted I've only seen the 8 port heads on the 181s. I layed a 153 gasket up on the 181 head and saw daylight around the outside of things ,so whole new system!! Here is a picture of both 153 on top.I've seen your posts over on "In Liners"
Hey JohnEvans Thanks a bunch on that schooling.1 question does the 181 gasket match the shape of the Port ? another words around that freeze plug as well?? I could still no dout make those flanges as well.I got these heads to see if the bolt-in lump ports could be done to them as well. The bad thing about making them out of steel is it takes more time to cut. so they end up costing just as much as the Alum. even thow steel has a cheaper cost over buying alum. And sorry jersey I thought i had what you needed.
Felpro lists them in their marine catalog. BUT there are several different ones depending on the serial # go figgure. 17301 is the Felpro # that matches my gasket/head.
Thanks .I knew the 181 has 3 different intake port sizes So the gaskets would go with out saying lol . Ok i just found out they will bolt up So Im going to see what's needed to be changed or added to these plates to make them work. Right off i can tell it will need the center line between the ports.
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