302 to 351
03-21-2008, 11:08 AM
#11
2nd Gear Member
Thread Starter
Join Date: Jul 2007
Location:
Posts: 456
RE: 302 to 351
yeah i will probably have to wait untill my car is paid off before i start that (2 more years)...the only reason i was wanting to just go to a 351 was because i would be one step closer to my 393 i am wanting
03-21-2008, 01:45 PM
#12
3rd Gear Member
Join Date: Nov 2007
Location: Washington, Seattle
Posts: 551
RE: 302 to 351
ORIGINAL: 92civy
The lower intake wont work, But the upper will work when bolted to a 351w lower. The cam from a 302 will work in a 351. The headers wont work due to the extra width and height!
The lower intake wont work, But the upper will work when bolted to a 351w lower. The cam from a 302 will work in a 351. The headers wont work due to the extra width and height!
03-22-2008, 12:03 PM
#13
4th Gear Member
Join Date: Jun 2006
Location:
Posts: 1,198
RE: 302 to 351
ORIGINAL: dudeboy
Specify which 5.0 upper intake you are talking about???
ORIGINAL: 92civy
The lower intake wont work, But the upper will work when bolted to a 351w lower. The cam from a 302 will work in a 351. The headers wont work due to the extra width and height!
The lower intake wont work, But the upper will work when bolted to a 351w lower. The cam from a 302 will work in a 351. The headers wont work due to the extra width and height!
"Intake Manifold-
Since the lifter valley of the taller 351w is wider than the 302, a new lower intake is required. Aftermarket suppliers of 351w intakes are numerous. Most of these companies offer a 351w lower intake that will bolt up to their 302 upper intakes, which many Mustang owners may already have. Being able to reuse your current upper intake can present a significant $ savings.
NOTE: It is often rumored that the stock Mustang upper will bolt up to a stock 351w EFI truck lower. No such combination has actually been found to work though. [/i]
However –[/i]
As of December of '06 there is a new product available for adapting a truck 351w EFI lower intake, to a Fox Mustang Upper intake. The adapter can be found through B.C. Broncos at http://www.bcbroncos.com/store/. Here is a link directly to the adapter http://bcbroncos.com/store/product_info.php?products_id=1176&osCsid=9fd34 cb5d813d8838e446ddda9faf1de
[/i]
Be cautious with intake height if you are trying to clear a stock hood. If the above mentioned drop motor mounts are not used then, another option for gaining hood clearance, is to cut down the upper intake. This is easier on the plastic box upper from Comp Cams, as the aluminum intakes will require cutting/welding followed by machining to square up the mating surface.
Shortening the upper intake will cause clearance issues between the TB and valve cover if the upper is trimmed more than ~¾â€. Keep in mind that TrickFlow and many other aftermarket head companies have raised the valve cover flange up to .300†which will limit how much you can trim from the upper intake. Of course the use of tall aftermarket valve covers will be somewhat restricted as well. If you do plan on cutting the upper intake, be sure to do a full mock up with all parts that will be installed later. The part numbers for the Ford 351w Cobra/Lightning manifold are as follows; Upper M-9424-D50 / Lower M-9461-D58."
Straight from your 351w swap webpage Jason.
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