All. I've acquired a 360 from the early 80s.

The deal on the motor was too good to pass up so once I took the heads in to get them magged, I was told they were actually from a 318. Now I understand using smaller heads on a bigger block, and everything bolts up just fine. Now the deal is that I was told by Jegs to get this manifold:
http://www.jegs.com/i/Weiand/925/8007/10002/-1

The issue with the manifold is that it doesn't seem to exactly match the heads. Here is why:


There is part of the heads that I would assume has something to do with cooling(?) that's not compatible with this manifold. Does anyone know of a manifold (preferably found at jegs) that would fix this?

Also, I have an alternator from Powermaster that is supposed to be a simple one-wire hookup. I don't think it will work for me either. I didn't think this motor was the one that required the "slim" alternator, was I wrong?

Here are the stamps on the motor:

and


I greatly appreciate anyone's help and advice. I'm a rookie to Mopars but got the motor I wanted to make my ride stand out. Now it's down to the nitty gritty.

 

afro -

Cool looking motor. No idea about the heads/manifold, but Weiand has been around for ever, and usually made a good product. Did you try calling JEGS or even Summit's tech support?

I'm sure some one here will know what's going on (I'm terrible with part numbers), just just in case, those guys at JEGS or Summit should have a clue.

Archer

 

I did a quick search and found this casting number list.

http://www.stockmopar.com/mopar-engi...g-numbers.html

Your number is a good number but, I don't have a clue why that manifold fits like it does. I would call the place where you bought it.

 

Is that located center of each head? If so it's a heat crossover, it passes warm air through the intake to aid in cold start ups. You can just block that off.

I would be concerned about the 318 heads on a 360 unless they have larger valves installed.

 

Agreed.! I have had several that did not line up for crossover. They work fine. No blocking them off required as I recall. I think the proper gasket does all thst is neeed. No biggee, just looks a bit ugly lest covered. gl440

 

Even stock intake manifolds don't cover up that hole. I would guess it is to allow heat expansion. That is the exhaust feed coming through the head, that mates with the intake "heat crossover." Many new guys get rattled when "that hole" shows up.

 

Wow that's great news. Thanks everyone for the help! Just to be as sure as possible, I'm going to call JEGS tomorrow to make sure it's ok. I'm glad there are some folks that understand my confusion here, and some that have seen this before.

 

heat crossover, they get pluged up in 10.000 miles anyhow. now what you will find is the manifold 360 manifold has larger runners than the 318 heads. there should be enough meat to gasket match, which i would do. also you may wanna opt for bigger valves stock 360 valves will fit a 318 without shrouding. or just get a set of 360 heads.

 

I've been thinking of that. I hate that I spent some on these to get them reconditioned already to find this out.

 

your 318 heads are just fine the hole in the photo is supposed to be exactly like it is.
It does not get blocked off even if you blocked the heat cross over. You are good to go.

 

If it were me I would certainly get 360 heads. You could always sell the 318 heads and get some of your jingle back. The 318 heads will work but they have smaller valves than the 360 heads and that motor will not live up to it's full potential.

 

Actually depending on the heads I have found the small valve small runner heads to add significant snap and power. You will sacrifice top end power above 4000 RPM If the heads are closed chamber you will bump your compression up as well. I would run them. Also the exposed cross over passage is normal as mentioned above. You can run the 360 manifold on the 318 heads just use the 360 intake caskets. Your really only other option would be to get a manifold made for a 318.. Most Edelbrock manifolds are 360 runner sized already but they fit a 318.
Motor looks great.

 

smaller valves will give you more torque at lower rpm,

 

hey i have a 77 aspen rt but i think its a super pack,it has the fender tag A57 and A66.... but it has 318 edilbrock street-master intake on it,,could the block still be a 360????

 

scotty, you should start a new thread

Easy way to tell a 360 from a 318 is to look at the front of the block, driver's side, immediately below the head/ block parting line. You will fiind a long string of stamped numbers, the 3 out of the first 4 I believe will give you the CID