Yellow Bullet Forums banner

21 - 36 of 36 Posts

·
Registered
Joined
·
137 Posts
I haven't ever seen A BB port that was bigger than 2.25" tube. Step every ten inches and run to about 28-30 inches long for that RPM. So two steps, 2.25-2.375-2.50. 3.5" collector is enough.:)
Calvin,
Where is your shop now? I bought a few sets of headers from you in the late 90's for C3 headed Craftsman Truck engines. A friend of mine who worked for Bahari Racing made me aware that you had helped their program and recommended we call you. Your headers were a soild 8 HP better than any others we had at the time, 8 was a pretty big gain for a bolt on part.

Thanks
 

·
Registered
Joined
·
10,719 Posts
ttt

I roughed it into pipemax and this is what it output.

--- Single Primary Pipe Specs --- for 554.429 CID from 4500 to 7000 RPM
Diameter= 2.045 to 2.170 Length= 29.2 to 31.8 inches long

--- 2-Step Primary Pipe Specs ---
1st Dia. inches= 2.045 Length= 14.6 to 15.9
2nd Dia. inches= 2.170 Length= 14.6 to 15.9
--- 3-Step Primary Pipe Specs ---
1st Dia. inches= 2.045 Length= 14.6 to 15.9
2nd Dia. inches= 2.170 Length= 7.3 to 7.9
3rd Dia. inches= 2.295 Length= 7.3 to 7.9

--- Header Collector Specs (Conventional Straight Tube) ---
Diameter= 3.717 to 3.967 Tuned Lengths= 16.7 best and also 8.4 or 33.5


Note-> all Pipe Diameters are OD and based-off .0625 inch Pipe thickness


Here's pipemax's customer dyno thread, you can check out some the builds there that might help you make a choice.

 

·
Registered
Joined
·
759 Posts
I haven't ever seen A BB port that was bigger than 2.25" tube. Step every ten inches and run to about 28-30 inches long for that RPM. So two steps, 2.25-2.375-2.50. 3.5" collector is enough.:)
At what point does a 3.5" collector become too small?
 

·
Registered
Joined
·
206 Posts
Calvin,
Where is your shop now? I bought a few sets of headers from you in the late 90's for C3 headed Craftsman Truck engines. A friend of mine who worked for Bahari Racing made me aware that you had helped their program and recommended we call you. Your headers were a soild 8 HP better than any others we had at the time, 8 was a pretty big gain for a bolt on part.

Thanks
4058 Matthews Indian Trail Rd. Matthews NC 28104
 
21 - 36 of 36 Posts
Top