351w Crate efi conversion

[Wyo4x4er]

Ok so I am currently collecting parts for my conversion while I am deployed. I am looking at buying a crate 351 from http://www.tristarengines.com/catal...crate-engine-hp-cast-iron-cylinder-heads.html and have just purchased a gt40 5.0 upper manifold.

My question is will that upper manifold hurt my engines performance a lot? Would it be better to get something like this http://www.blueovalindustries.com/en5015.html?

My gut tells me as the engine is got stock iron heads and just a mild cam I should be ok.

 

[ScanmanSteven]

No, but...You'll need a Lightning lower to match that upper at about $500.00. They are hard ro find and expensive. You could use a truck lower with the BCB adapter then use a Mustang upper, which would be easier. If you use a Lightning lower then you probably want to use different heads to get better flowas in GT40 off an Explorer 5.0.

See the thread about the ARB 28 spline axles from today to understand the upgrade process by DirkDonk, lol.

 

[rguest3]

Yes your crate engine will come with Cast Iron Heads.

I agree the Truck 351w lower would be best with a BC Broncos adaptor for the Mustang GT Upper. Both of these have the Intake ports that are in a straight line. This set up will clear the stock hood as well.....The GT40s ports are staggered.

Since you already have ht eGT40 upper the ONLY Lower Intake that will match that is the Lightning Lower 351w intake. However, these ports will be larger than what the heads have and would not be a good match.

 

[00gyrhed]

I am have the blue oval industries intake on my 393 project. THer runners are way bigger than the cast iron head ports will be.

I was origianlly going to run the truck lower BC adapter and Mustang upper. I have all that stuff laying arround here I will never use. It would be just fine with stock heads. In fact I would give you the truck lower and mustang upper if your bought the adapter from me and paid shipping on the whole thing. $80 bucks + shipping and crate material if needed gets it all. Come by the house $75 and you might even leave with more free stuff.

PM me if you are interested.