Exhaust port dimensions?
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Sorry but when I had my stock headers off to port them I didn't measure the dimensions of the D-ports.
BTW, the D-port in the #113 head will have a different dimension from the port in the #128 head.
BTW, the D-port in the #113 head will have a different dimension from the port in the #128 head.
Instructor
Joined: Mar 2002
Posts: 239
Likes: 0
From: Fredericksburg VA
From my notes for the 113 D-port I have:
1.55" horizontal dimension (flat part of the D)
1.475" vertical dimension (total port height)
0.775" radius along the upper port surface
5.38" perimeter length (requires 1.75" header pipe without stretching)
Someone should check this if they have a head on the bench.
1.55" horizontal dimension (flat part of the D)
1.475" vertical dimension (total port height)
0.775" radius along the upper port surface
5.38" perimeter length (requires 1.75" header pipe without stretching)
Someone should check this if they have a head on the bench.
Thread Starter
Melting Slicks
Joined: May 1999
Posts: 2,037
Likes: 0
From: Sarasota FL
Wow, 1.5 wide? I wanted to avoid pulling my manifolds and measuring my 128 ports, but I might have to know for sure. Hedman's new elite headers for the Vette are built better than their regular ones, but the ports on the headers are only 1.25 wide!
