Mine is a 90 GT with a stock hood and 3/8” is the tallest spacer I can fit there. So I have a 3/8” phenolic spacer. The intakes will be cooler when I block the EGR port at the heads.I Had to use a 1" spacer between the upper and lower plenum so that the upper plenum would clear the "Godzilla" coils. So, I happen to have the added benefit of a cooler upper plenum. It might help you in the future if there is enough hood clearance in your Mustang.
1" Delrin spacer
Not bad but like the cervini’s shape better
I like the curvature of the cowl on the HO hoods. Unfortunately the underside is raw fiberglass in the center but I finished it and smoothed it with resin and its finished under nowThey are a great hood that is for sure and the car will look awesome with it! I (and I think @95steedamustang) like how the HO Fibertrends are finished underneath as it made for easy work when it was painted.
My 3/8” phenolic spacer has the EGR hole but in my case I’ll order a set of either FLP-1250-S3 or FLP-1262-S3 lower intake gaskets, those S3 gaskets don’t have the EGR hole so you block those gases right at the heads and that keeps some of the heat downI need to find myself a 3/8" spacer with the hole blocked off too.
I have seen guys in the past just take the fat end off a razor and sandwich it there.
Yeah sometimes plans change and come up after the fact but that spacer will work fineIn hindsight, that’s what I should have done but I don’t want to pull the lower intake. Just looking to block it at the lower
Only one I can find is the bbk 3/8” without the hole
Ford GT40 Cobra Intake Manifold 3/8 Inch Phenolic Spacer Kit 86-95
Enhance Your Ford GT40 Performance with the Cobra Intake Manifold PART #1506 FEATURES: Promotes - BBK Performancebbkperformance.com
@Mustang5L5 I haven't heard of the thin razor blade trick. I knew that I didn't want hot gases hitting against the "Delrin" spacer if the passageway wasn't entirely clogged and really didn't want to remove the lower plenum just to block off the holes in the heads, so I used a 1/2" pipe thread tap and a brass Allen head plug to block it. I may have already said this but here are the pictures for anyone wanting to do the same.
Actually the Felpro 1250 intake gaskets have an insert to allow you to keep the EGR port open or block it off.Tapping for a pipe plug is an excellent way to address the lower intake ERG port. I used a Dorman steel shouldered expansion plug on mine., as mentioned earlier in the thread. I did tap and plug the exhaust crossover/EGR passages coming out of my AFR heads (1/4" NPT) to stop the exhaust gasses from heating up the lower.
Another old school way to address the lower intake EGR passage (if you had the lower intake off) would be to pack it with furnace cement. This method worked on patching up late 70's to early 80's Ford EGR spacers found under the carburetors The exhaust gasses would eat away at the cast EGR spacer over time and you would have an under-hood exhaust leak. Pack the ERG spacer cavity with furnace cement and move on. Not very elegant, but it was highly effective with no comebacks. There may be some suitable high temp epoxy products on the market today, but this was an inexpensive "Saturday Afternoon Hardware Store Solution" that would work. Welding a passage closed is really the best answer, but not everyone has convenient access to that.
Edit: typo
Yeah I thought about how those older cars worked fine without that damn EGR…Think of it like an old car
An old car has no EGR and runs fine
No overheated intakes or heads or any of that
If yours runs poor, it's not the EGR's fault or the cylinder head temp
Think of what manicmechanic's boss 302 would do (mine)
It would run like a raped ape with no EGR, be hot as a firecracker and still run like a raped ape
Rethink your EGR strategy
We all breathe the same air
If your processor sees no pintle valve movement of the EGR valve from the EVP sensor, it will run like puke, just like if you put a bb in the vacuum line
Trying to chit the system is futile with resistors, the processor wants to see pintle valve movement
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