Question on ram's horn manifolds - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Jeff's72C10* · 10-01-2023, 01:01 PM

Curious as to what the largist exhaust pipe that can be bolted to these? 2.50, 2.75 or 3 inch. TIA

**truckster** · 10-01-2023, 01:05 PM

Which rams horns are you using? Stock truck, or the Corvette-style 2.5"? I have the Corvette-style 2.5" and 2.5" stainless tubing. That's an easy fit. I think you could get 3" in there if you have the right flange.

**MikeB** · 10-01-2023, 01:16 PM

Exhaust shops use 2-1/4" all the time, so it's ezee-peezy. But you can use a 2.5" head pipe pipe if you neck it down to 2".

Also Magnaflow, Flowmaster, and Pypes sell a pair of stainless 2.5" down pipes that are necked down to fit the truck manifolds with 45 degree dump. They have a smooth mandrel bend that runs back another 3 feet or so.

Flowmaster 81072

Jeff's72C10* · 10-01-2023, 01:26 PM

Quote:

Originally Posted by truckster

Which rams horns are you using? Stock truck, or the Corvette-style 2.5"? I have the Corvette-style 2.5" and 2.5" stainless tubing. That's an easy fit. I think you could get 3" in there if you have the right flange.

They're after market from Dorman, so it's most likely the stock size pipe

Jeff's72C10* · 10-01-2023, 01:48 PM

Quote:

Originally Posted by MikeB

Exhaust shops use 2-1/4" all the time, so it's ezee-peezy. But you can use a 2.5" head pipe pipe if you neck it down to 2".

Also Magnaflow, Flowmaster, and Pypes sell a pair of stainless 2.5" down pipes that are necked down to fit the truck manifolds with 45 degree dump. They have a smooth mandrel bend that runs back another 3 feet or so.

Flowmaster 81072

Thx, I'll look into those.

10-01-2023, 01:01 PM	#1
Jeff's72C10* Active Member Join Date: Mar 2018 Location: Del Rio Posts: 166	Question on ram's horn manifolds Curious as to what the largist exhaust pipe that can be bolted to these? 2.50, 2.75 or 3 inch. TIA __________________ Previous C10's 69 SB CST - sold 72 Cheyenne Super LB - sold

10-01-2023, 01:05 PM	#2
truckster Senior Member Join Date: Jan 2001 Location: Orem, Utah Posts: 7,941	Re: Question on ram's horn manifolds Which rams horns are you using? Stock truck, or the Corvette-style 2.5"? I have the Corvette-style 2.5" and 2.5" stainless tubing. That's an easy fit. I think you could get 3" in there if you have the right flange. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson

10-01-2023, 01:16 PM	#3
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,544	Re: Question on ram's horn manifolds Exhaust shops use 2-1/4" all the time, so it's ezee-peezy. But you can use a 2.5" head pipe pipe if you neck it down to 2". Also Magnaflow, Flowmaster, and Pypes sell a pair of stainless 2.5" down pipes that are necked down to fit the truck manifolds with 45 degree dump. They have a smooth mandrel bend that runs back another 3 feet or so. Flowmaster 81072 __________________ Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!



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