Pay Dues or become a Site Supporter |
#11
|
|||
|
|||
Re: Proper sized exhaust
While calculations show 500 CFM to be overkill on a 305 running at factory designed engine speeds, as with many things, calculations do not represent real world results. More than likely, the same engine with a 500 CFM carb will make more horsepower than the same engine with a 350 CFM carb, or the factory carb.
[/QUOTE] Turbobill. I fully agree with you on that Years ago I tested all 3 of these carbs on my 68 305E and the Holley 500 was still by far the top performer, it's all about the real world results |
#12
|
||||
|
||||
Re: Proper sized exhaust
Back to JB's question. Funky's video spells it out in the opening screen: 2 1/4" opening up to 2 1/2", with an X-pipe and dual exhaust. You can change the sound with different mufflers and pipes after the mufflers. Thanks Funky, I enjoyed every note. The PO of my truck put the mufflers under the cab--with no pipes after. Talk about loud with a "Wheels of Tragedy" scenario.
|
#13
|
||||
|
||||
Re: Proper sized exhaust
My exhaust manifolds measured 2.25 so I went with 2.25 inch pipes to the muffler and exited the muffler with 2.5 inch tail pipes. True duals. No cross over.
https://www.youtube.com/watch?v=RCfanx30JO8
__________________
"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#14
|
||||
|
||||
Re: Proper sized exhaust
I always thought those 40's would sound too loud ,
but they seem tame enough on you video TJ. How are they on the highway?
__________________
1961 GMC Suburban 305A Overdrive 1962 GMC Utility 305D |
#15
|
||||
|
||||
Re: Proper sized exhaust
Quote:
Personally I like a little bit of Loud so it may be harder for me to say. The 40's were actually Quieter than I expected. Cruising down the highway at 2400 RPM they are very quiet. At 2000 RPM they Can get a little annoying if you don't mind some cab noise. But floor that sucker and rev it out and at 2500-3500 that tone will bounce off of fences and canyons and put a big smile on your face. lol I will be doing a wot run/driving video soon.
__________________
"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#16
|
||||
|
||||
Re: Proper sized exhaust
Quote:
Exactly!!!! Math results aren't Everything. According to Math the small 2 stroke chainsaw engine is not supposed to even run. BUT! They run very well and very efficiently. Real world is what matters. Math would show that my 600 edelbrock 4 barrel would drown my 305 out, yet it performs rather well!
__________________
"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#17
|
||||
|
||||
Re: Proper sized exhaust
Here is a video of a 305 with flowmaster 50's. Bout the same, but at RPM they are supposed to be tamer than the 40's.
https://www.youtube.com/watch?v=FkpTLxOj-rI
__________________
"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. Last edited by TJ's GMC; December 3rd, 2016 at 03:56 PM. |
#18
|
||||
|
||||
Re: Proper sized exhaust
Ok thanks Guys, I'll go the dual exhaust route with 21/2 pipes and a cross over.
Jake |
#19
|
||||
|
||||
Re: Proper sized exhaust
Be sure to post a video!
__________________
"Excuse the rust I use my truck" 1964 GMC 1500 305E/sm420 4 barrel intake mod and dual exhaust. To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. 1964 Chevy C20 292/SM420 1966 Chevy C10 292 hotrod 6/TKO600 My youtube channel aka Military Chevy: To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#20
|
|||
|
|||
Re: Proper sized exhaust
I'm pretty happy with 2 1/2 inch duals and 50 series mufflers on my 68 478M, of course that's the same system when I had the 305E, In the future I may switch over to 3 inch pipes and 40 series mufflers
|
Bookmarks |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
305 V6 over sized pistons | Archiver | Previous Forum Posts | 13 | January 21st, 2013 07:18 PM |
interchange of parts across different sized V6's | Archiver | Previous Forum Posts | 0 | March 21st, 2012 04:29 AM |
proper hardware for valve covers | Archiver | Previous Forum Posts | 4 | February 11th, 2012 05:20 AM |
Proper 637 thermostat | Archiver | Previous Forum Posts | 0 | February 5th, 2005 07:49 AM |
Proper Spark Plug | Archiver | Previous Forum Posts | 0 | May 19th, 2004 01:53 AM |