Thinking about going true dual
07-22-2008, 08:57 AM
#11
right, but even 2.5" duals are decently big for only 325 cubes. 2.25" duals is just a tad larger x-sectional area compared to a 3" single. It just doesn't sound as manly to say 2.25" duals I guess...
Just for a comparison, even though its different generations of small-block, the hopped up 350 in my '66 truck made ~400hp/~415lb-ft torque on an engine dyno. Torque was about 400 lb-ft at 3.5k all the way until about 5k. This was running through 1-5/8" headers with 2.5" collectors, and has 2.5" duals on the truck with an x-pipe.
I could be wrong, but I doubt the engine in your truck is that strong, and you'd have more area under the torque curve in the usable rpm range that you'd be in on a day to day basis with 2.25" dual. But hey, its your truck, so do whatever pulls your trigger.
Just for a comparison, even though its different generations of small-block, the hopped up 350 in my '66 truck made ~400hp/~415lb-ft torque on an engine dyno. Torque was about 400 lb-ft at 3.5k all the way until about 5k. This was running through 1-5/8" headers with 2.5" collectors, and has 2.5" duals on the truck with an x-pipe.
I could be wrong, but I doubt the engine in your truck is that strong, and you'd have more area under the torque curve in the usable rpm range that you'd be in on a day to day basis with 2.25" dual. But hey, its your truck, so do whatever pulls your trigger.
07-22-2008, 10:28 AM
#13
If you think you're in the 380-390hp range, dual 2.5" is all your motor requires. I'd go as far as necking down to 2.25" after the X-pipe to keep exhaust gas velocity up.
08-21-2008, 10:42 PM
#16
Staging Lane
Join Date: Nov 2007
Location: Ontario Canada
Posts: 75
Likes: 0
Received 0 Likes
on
0 Posts
old set up stock y pipe magnoflow 1 into 2.5 inch dual 451 torque new set up pacesetters high flow IMCO metal core cats x pipe 2 16 inch imco mufflers 3 inch from front to back new set up 492 torque. engine is out right now getting all forged new dyno numbers comming soon. 
[IMG]
[IMG]
Last edited by supercharged tahoe ss; 08-21-2008 at 10:47 PM.
Thread
Thread Starter
Forum
Replies
Last Post
Raggedz71
TOWING & OFFROAD PERFORMANCE
3
07-29-2016 10:20 AM
thewrx
Cars and Motorcycle Classifieds
1
08-12-2015 08:28 PM
lxcoupe
GM Engine & Exhaust Performance
1
07-30-2015 02:42 PM
Offroadunleashed
Trucks and SUV Classifieds
0
07-20-2015 02:25 PM