headers D port heads
Thread Starter
Racer
Joined: Sep 2005
Posts: 336
Likes: 0
From: staten island ny
headers D port heads
i have being reading and still can make a positive decision on wich headers to order i have a 69 vette with d port aluminum heads from edelbrock straight plugs does it matter if i bye headers that are not D port could somebody help me on choosing the correct headers. so far this is what i found
flowtech 31106flt and hookers 66309
please advise
thanks
flowtech 31106flt and hookers 66309
please advise
thanks
Advanced
Joined: Dec 2007
Posts: 89
Likes: 0
From: Clayton North Carolina
I believe neither of those are D-port headers. The hookers have a slightly larger opening so they may not restrict flow. Heddman makes a D-port header in both ther block hugger and standard version. I just recently installed the block huggers on my 81 with no interference issues at all. I went with the block huggers only because I am running sidepipes and the standard longtube headers force the sidepipes to far down the car.
If the motor is a high performance block, you want a s little restriction as possible especially from the heads to the exhaust ports
Good luck
Mark
If the motor is a high performance block, you want a s little restriction as possible especially from the heads to the exhaust ports
Good luck
Mark
Racer
Joined: Jul 2008
Posts: 338
Likes: 4
From: Bowling Green Kentucky
Headers
I have the Flowtek headers on my Performer RPM heads. They wouk fine with the D ports. There even may be an advantage to having the mismatch of the flat floor in the port and the round tube on the primary. It will aid as a bit of a reversionary dam to help keep the exhaust gasses from being pulled back into the cylinders and contaminating the intake charge when the intake valve is beginning to open before the exhaust valve is completely closed. (overlap)
Thread Starter
Racer
Joined: Sep 2005
Posts: 336
Likes: 0
From: staten island ny
flowtech
[QUOTE=HBZ_81_C3;1572301756]I have the Flowtek headers on my Performer RPM heads. They wouk fine with the D ports. There even may be an advantage to having the mismatch of the flat floor in the port and the round tube on the primary. It will aid as a bit of a reversionary dam to help keep the exhaust gasses from being pulled back into the cylinders and contaminating the intake charge when the intake valve is beginning to open before the exhaust valve is completely closed.
thanks for the response i have the performer heads to so ill go ahead and order the flowtech headers
thanks for the response i have the performer heads to so ill go ahead and order the flowtech headers
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
D-port headers are nonsense.
I have the Flowtek headers on my Performer RPM heads. They wouk fine with the D ports. There even may be an advantage to having the mismatch of the flat floor in the port and the round tube on the primary. It will aid as a bit of a reversionary dam to help keep the exhaust gasses from being pulled back into the cylinders and contaminating the intake charge when the intake valve is beginning to open before the exhaust valve is completely closed. (overlap)
Too much eyeball engineering and no facts to back it up.
BTW i really like my Doug Thorley headers.
cardo0
