Welcome to VMF You probably want these ronmorrisperformance.com RMP Adjustable Motor Mounts
Maybe PM @dobrostang or maybe he'll chime in he has a 351w in a 66 and has lowered and moved it it Back some

 

Hello/Welcome
I believe there are several manufacturers that make adjustable/drop engine mounts for that chassis. The main issue is oil pan-to-steering linkage clearance.

I am actually surprised that hood clearance is your issue considering the height of the stock carburetor and air cleaner. I would have though that upper manifold-to-shock tower brace clearance would be the major issue. Do you have the engine mocked up in the engine bay?

Thanks
Paul

 

The main issue is oil pan-to-steering linkage clearance.

When I lowered my 351W the only interference was with the engine crossmember. The oem crossmember is deep enough, but the angled drop contacts the pan edge. I made one to fix the problem.

 

I've got a 351w in my 65 fastback. I used 66 style motor mounts/brackets and it fits with an Edelbrock air gap intake but then I do have a Shelby hood scoop. I too am curious as to why you don't think it'll fit? Are you worried the supercharger isn't going to fit under the hood, or...?

 

Are you worried the supercharger isn't going to fit under the hood, or...?

I didnt read that the OP was adding a supercharger...

Paul

 

5.8 (IE, Gen 1) Lightnings were not supercharged. Basically a regular roller cam 5.8 engine but they used a flat tappet cam instead. Also GT40 iron heads and a unique upper and lower intake. Which won't fit under a Mustang hood but the F150 guys will sure pay good money for them. Almost enough to pay for an intake setup that will fit AND offer better performance.
So basically you can duplicate a Lightning engine with any regular 5.8 out of a van, work truck, or whatever by slapping better heads and intake/s on it.

 

Ah, you can see how much I know about newer vehicles. I assumed all lightning engines were the supercharged ones. Were the supercharged ones the 5.4 liter?

 

The 5.4's were the supercharged ones, yes. The Lightning/F150 folks also have their forums where such is discussed in more detail than you'd ever want to know.
Incidentally the 351W ones were factory rated at 240HP. Gosh wow, right? The 5.4 supercharged ones were 360-380 HP, depending on who you ask.

 

It’s funny to see the evolution. The 5.8’s were 240 which was a huge number. Then the 5.4 with the 360 to 380 which was incredible. The stock 5.0 Coyote in my truck makes 360 and I just got 20.4 mpg on a 155 mile trip. I think the 2018 5.0 is rated at 400 I think. I know the 2015 was 380.

 

Here is a link to a thread about putting a trick flow intake on a 351 in a 67 Mustang. I think the trick flow website has a measurement of how tall their manifold is. You could measure yours and compare

http://forums.vintage-mustang.com/mod-custom-forum/662822-67-351w-rpm2-stock-hood.html

 

Hi All, thx for the help. I will look into the Ron Morris mounts as well as the suggestion about the 66 mounts. Yes this is a 1st Gen Lightning not supercharged but still very tall.

 

I dropped my 351W down 1" and back a bunch with some knocked off RM mounts. The 1" down makes for some interesting fitment issues with the steering linkage, and even more fun with a Unisteer Rack. I ended up remanufacturing the rack mount to fit. Here are some crunchy pictures of when I first mocked up the trans and block for driveline angle and tunnel clearance checks.

 

I dropped my 351W down 1" and back a bunch with some knocked off RM mounts. The 1" down makes for some interesting fitment issues with the steering linkage, and even more fun with a Unisteer Rack. I ended up remanufacturing the rack mount to fit. Here are some crunchy pictures of when I first mocked up the trans and block for driveline angle and tunnel clearance checks.

View attachment 626450

View attachment 626458

I have RM mounts, which is typically a 1/2" drop. With your mod, is it now a 1- 1/2" drop? How was header fitment? I had to lower my R&P 1/2" due to my lowering RM mounts.

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