What the heck is this gasket from?!

[Voodoo]

I bought my headers a while back. They were an open-box-but-new kinda deal, insanely good price. They had gaskets in there, which looked like they were opened then taped back closed, but I never really checked them that close. When I went to hang the headers on the 440 the other day, I realized they were WAY off. These ports are HUGE!!! I have stock 906 heads, but lord what has ports that big?? The space shuttle!? The crazy part is, bolt spacing was correct for the gaskets, so I am thinking it must be Mopar still... Props to my dad for casually having a spare set of gaskets on hand and saving the day.

 

[vance.dykes]

HEMI ?

 

[gtxrt]

hemi bolts are off set.

 

[1danc]

Max Wedge ? They're not perfectly square like that , could be an aftermarket race size port ?

 

[Mick56]

For an EGR valve?

 

[kiwigtx]

Poly 318 or Ford Cleveland?

 

[rrTor-Red]

I bought my headers a while back. They were an open-box-but-new kinda deal, insanely good price. They had gaskets in there, which looked like they were opened then taped back closed, but I never really checked them that close. When I went to hang the headers on the 440 the other day, I realized they were WAY off. These ports are HUGE!!! I have stock 906 heads, but lord what has ports that big?? The space shuttle!? The crazy part is, bolt spacing was correct for the gaskets, so I am thinking it must be Mopar still... Props to my dad for casually having a spare set of gaskets on hand and saving the day.

View attachment 1797273

Get Remflex gaskets

 

[Daliant]

Poly 318

 

[khryslerkid]

Poly 318 or Ford Cleveland?

Poly 318

Studs are diagonal on the 318.

 

[Voodoo]

Studs are diagonal on the 318.

Yeah, I had a poly in my other charger, definitely not that!

Closest guess I have is some race specific head to need a monstrous exhaust port like that.