4.5 Whipple guys

[Marc W]

I will buy the spacers from you

You’re first in line. I’ll know what we decide to do after the blower is off and we can see what’s going on. For sure we are plugging the offending holes in the heads and have ordered the gaskets. Let you know...

 

[Hpindy]

Good info for future upgrades !

Sent from my BBF100-2 using Tapatalk

 

[Kat von Himmel]

I chucked the spacers and went with cometics.

Zero oil in the valley since, thank goodness. That took me several weeks to chase down myself.

If you want more space, why not use gaskets on top and bottom of the spacers, and not rely on their built-in O-rings?

 

[Best Vapor]

Very good info here

 

[DemonSRT]

I had a similar issue, oil pooling in the valley. It turns out that some bolt holes provisioned for non-Hellcat manifolds on the Thiteks breach into oil filled spaces. The solution is to plug and seal these holes up. I used 5mm set screws with thread sealant and then I purchased a set of cometic intake gaskets since they mostly cover these holes. The cometic gaskets are probably not necessary if the holes are plugged properly but that’s what I did.

I tried the spacers before I figured out where the oil was really coming from. Take notice of where the oil is collecting. Outside of the intake port gaskets!

I circled the holes that need to be plugged in yellow. If you shine a light in the green circled oil galley, it’ll shine through and be visible through the nearest yellow hole.
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You need to make a correction to your info here. The set screw size needed to plug the small inner holes are not 5mm, they are 6mm. Just went through the same problem on my new engine and had to return the 5mm set screws which ended up too small and waste another 1-1/2 hours of driving to get 6mm ones instead that worked perfectly along with a good thread sealant. This is a problem that is related to only the combination of Thitek Heads and FI spacers and has nothing to do with what twin screw your using. Found out from AJ that Thitek was suppose to stop drilling the holes right thru, but apparently Thitek has not done that yet or are getting rid of older stock first.

 

[zhc]

You need to make a correction to your info here. The set screw size needed to plug the small inner holes are not 5mm, they are 6mm. Just went through the same problem on my new engine and had to return the 5mm set screws which ended up too small and waste another 1-1/2 hours of driving to get 6mm ones instead that worked perfectly along with a good thread sealant. This is a problem that is related to only the combination of Thitek Heads and FI spacers and has nothing to do with what twin screw your using. Found out from AJ that Thitek was suppose to stop drilling the holes right thru, but apparently Thitek has not done that yet or are getting rid of older stock first.

You're right, it's 6mm not 5mm.