max hp with 2in ramhorns - The 1947 - Present Chevrolet & GMC Truck Message Board Network

crm318 · 11-22-2007, 09:03 PM

i am tired of changing out gaskets with my lontube headers. i was thinking about going back to ramhorns. my engine specs are listed below. how much horsepower can 2in ramhorns support? i also plan or running vortec heads and it will have 350 hp with that setup in the near future. should i stay with the longtubes or will ramhorns flow that much?

stepside454 · 11-22-2007, 09:32 PM

youll notice some loss across the board. maybe consider a good set of headers. I know there not cheap, but a quality built header wont give you problems like that. Ive got a set of Sanderson headers on mine. havent blown a gasket in the 4 years theyve been on it....oh did I forget to mention, they dont use any gaskets...at all, just a dab of silicone around each port. they make both long & short tube headers for our trucks with big & small block, they also have performance manifolds

Critter · 11-22-2007, 09:36 PM

I've never owned a pair, but aren't shorty headers better about not leaking? Just not as much metal dangling down and vibrating around off of the heads.

stepside454 · 11-22-2007, 10:32 PM

I think its just a matter of a good set of headers vs. a poorley made set

**special-K** · 11-23-2007, 06:40 AM

All you have to do with cheap headers is go over the header to head bolts every now and then.By the time you hear it "tick" it`s usually too late.I check mine when I change the oil.

Tx Firefighter · 11-23-2007, 07:41 AM

You know that Corvette rams horn manifolds were 2 1/2" right? You get the best of both worlds, manifolds and flow.

stepside454 · 11-23-2007, 08:19 AM

they do flow well....but not like headers

Gray Ghost · 11-23-2007, 08:24 AM

Shorty headers are better about that. I goofed and got long tubes this time and I regret it. Had a set of shortys on the Elky and they were great.

The other thing is the thickness of the flange...mine's 3/16", but the 3/8" [like Hedman Elite Shorty] are much better. These are the ones I will be buying for both trucks down the road.

Very nice big block you have there!

Tx Firefighter · 11-23-2007, 08:34 AM

In his truck with a small block, vortec heads, Comp 268 cam and highway gears, the bigger rams horns will be ideal. He'll never turn enough RPM to realize any significant flow advantage of top of the line headers.

With that setup, he'll spend 99 percent of his time below 3000 RPM

crm318 · 11-23-2007, 09:25 AM

yea, i have heard of the 2.5 ramhorns. i would love to have a set, but everywhere i see them, they are super expensive.

60ratrod · 11-23-2007, 01:23 PM

personally i would change to copper round port header gaskets. when i first put my headers on my 60 c10 the gaskets were fine until my passenger side went out on me. i haven't had a problem with my coppers yet. a good set will run you about a good $50 though

crm318 · 11-23-2007, 05:13 PM

the problem with my gaskets are that the outsides where the bolt holes go are really thin and they burn. the outside header bolts were covered in carbon. maybe ill give the copper gaskets look.

60ratrod · 11-28-2007, 02:26 PM

they are worth the money and the best part is they are re-usable. the only way that you can blow them is if they get melted and if you are melting them then you have other issues you need to look at.

hotrodhomi · 11-28-2007, 03:12 PM

I bought mine new for $115 shipped. Is that too expensive? Everywhere else was much more.

olblue60@aol.com · 11-28-2007, 03:36 PM

It seems that nowdays, 350 Hp is a pretty low HP rating. The factory crate engines with that kind of hp are using 2 inch exhaust manifolds. The ramhorns are in my opinion the best flowing manifolds that GM has ever made. It seems that 2 1/2 inch would work fine, they would be much quieter in the cab and last forever. Probably cheaper than a couple of more sets of headers that you may need before you eventually sell your truck and you get to skip one installation

Mondo · 11-28-2007, 05:41 PM

What year corvettes did the manifolds your talking about come from? I think I want to go that route but see different manifolds for different years...

BHRS · 11-28-2007, 06:46 PM

They are not only used on old Corvettes. Look for 1962-1964 Impala's with a 300 hp 327-they came with the 2-1/2" rams horn manifolds. Also the alternator mounts to the manifold with a bracket from the manifold to the water pump. These engines had the double-hump heads with no accessory holes in the heads.

Good Luck

hotrodhomi · 11-28-2007, 06:51 PM

This is by far the best deal I could find. If you can find a new set cheaper, jump on it.

http://www.performanceexhaustplus.com/

Part number 674-504
Manifold - 1963-62 5.4L (327 CID) Corvette Ram's Horn, LH, 2-1/2" Dia. $57.45

Part number 674-503
Manifold - 1965-62 5.4L (327 CID) Corvette Ram's Horn, RH, 2-1/2" Dia. $57.45

Subtotal : $114.90
Shipping (Free Ground Service): $0.00
Tax : $0.00
Total : $114.90

jimfulco · 11-28-2007, 11:15 PM

Go to www.partsamerica.com and look up manifolds for a '65 Corvette with 327 engine. They list them by Motormite and Dorman, for ~$80 each.

11-22-2007, 09:03 PM	#1
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	max hp with 2in ramhorns i am tired of changing out gaskets with my lontube headers. i was thinking about going back to ramhorns. my engine specs are listed below. how much horsepower can 2in ramhorns support? i also plan or running vortec heads and it will have 350 hp with that setup in the near future. should i stay with the longtubes or will ramhorns flow that much? __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

11-22-2007, 09:32 PM	#2
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	Re: max hp with 2in ramhorns youll notice some loss across the board. maybe consider a good set of headers. I know there not cheap, but a quality built header wont give you problems like that. Ive got a set of Sanderson headers on mine. havent blown a gasket in the 4 years theyve been on it....oh did I forget to mention, they dont use any gaskets...at all, just a dab of silicone around each port. they make both long & short tube headers for our trucks with big & small block, they also have performance manifolds Attached Images __________________ 75 GMC C-15 short/step factory 454, lowered

11-22-2007, 09:36 PM	#3
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	Re: max hp with 2in ramhorns I've never owned a pair, but aren't shorty headers better about not leaking? Just not as much metal dangling down and vibrating around off of the heads. __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com

11-22-2007, 10:32 PM	#4
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	Re: max hp with 2in ramhorns I think its just a matter of a good set of headers vs. a poorley made set __________________ 75 GMC C-15 short/step factory 454, lowered

11-23-2007, 06:40 AM	#5
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: max hp with 2in ramhorns All you have to do with cheap headers is go over the header to head bolts every now and then.By the time you hear it "tick" it`s usually too late.I check mine when I change the oil. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

11-23-2007, 07:41 AM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: max hp with 2in ramhorns You know that Corvette rams horn manifolds were 2 1/2" right? You get the best of both worlds, manifolds and flow. __________________ I'm on the Instagram- @Gearhead_Kevin

11-23-2007, 08:19 AM	#7
stepside454 Registered User Join Date: Nov 2003 Location: st. louis area Posts: 1,551	Re: max hp with 2in ramhorns they do flow well....but not like headers __________________ 75 GMC C-15 short/step factory 454, lowered

11-23-2007, 08:24 AM	#8
Gray Ghost Senior Member Join Date: Sep 2004 Location: Terrell, TX Posts: 1,967	Re: max hp with 2in ramhorns Shorty headers are better about that. I goofed and got long tubes this time and I regret it. Had a set of shortys on the Elky and they were great. The other thing is the thickness of the flange...mine's 3/16", but the 3/8" [like Hedman Elite Shorty] are much better. These are the ones I will be buying for both trucks down the road. Very nice big block you have there! __________________ Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. Last edited by Gray Ghost; 11-23-2007 at 08:24 AM.

11-23-2007, 08:34 AM	#9
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: max hp with 2in ramhorns In his truck with a small block, vortec heads, Comp 268 cam and highway gears, the bigger rams horns will be ideal. He'll never turn enough RPM to realize any significant flow advantage of top of the line headers. With that setup, he'll spend 99 percent of his time below 3000 RPM __________________ I'm on the Instagram- @Gearhead_Kevin

11-23-2007, 09:25 AM	#10
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: max hp with 2in ramhorns yea, i have heard of the 2.5 ramhorns. i would love to have a set, but everywhere i see them, they are super expensive. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

11-23-2007, 01:23 PM	#11
60ratrod yes, i do Join Date: Jun 2007 Location: Spokane, wa Posts: 2,734	Re: max hp with 2in ramhorns personally i would change to copper round port header gaskets. when i first put my headers on my 60 c10 the gaskets were fine until my passenger side went out on me. i haven't had a problem with my coppers yet. a good set will run you about a good $50 though __________________ ERROR 404....... SNAPPY COMEBACK NOT FOUND _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900

11-23-2007, 05:13 PM	#12
crm318 Alright Alright Alright Join Date: Mar 2004 Location: Midland, Texas Posts: 1,672	Re: max hp with 2in ramhorns the problem with my gaskets are that the outsides where the bolt holes go are really thin and they burn. the outside header bolts were covered in carbon. maybe ill give the copper gaskets look. __________________ 1972 Cheyenne Chevrolet red and white 357ci, Vortec heads, GM Performance high rise intake, Comp 268H .454/.454 218/218 110 LSA Quadrajet carb, Flowtech headers, 2.25 40 series HEI, Curve kit, TH 350, 3.07 gears 275/60/15s on 15x8 rallies

11-28-2007, 02:26 PM	#13
60ratrod yes, i do Join Date: Jun 2007 Location: Spokane, wa Posts: 2,734	Re: max hp with 2in ramhorns they are worth the money and the best part is they are re-usable. the only way that you can blow them is if they get melted and if you are melting them then you have other issues you need to look at. __________________ ERROR 404....... SNAPPY COMEBACK NOT FOUND _______________________________________________________________________________________________ -60 Chevy C10, dead 350/good th350 combo, sitting on a 76 c10 blazer frame, built from 11 different vehicles "the abomination" -07 gmt900 silverado 1500 lt xcab z71, granite blue -81 suzuki gs650g "shelah"- current project -81 kz1000m1 csr "sarge" -next project (just beautification) -07 kawasaki vulcan classic vn900

11-28-2007, 03:12 PM	#14
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	Re: max hp with 2in ramhorns I bought mine new for $115 shipped. Is that too expensive? Everywhere else was much more. __________________ '72 2wd blazer, bagged w/ watts link & EDC '72 C10 "Lowered Farm Truck" STOLEN 5-18-11 '66 impala ht

11-28-2007, 03:36 PM	#15
olblue60@aol.com member Join Date: Dec 2003 Location: Silver Spring Md.20901 Posts: 2,031	Re: max hp with 2in ramhorns It seems that nowdays, 350 Hp is a pretty low HP rating. The factory crate engines with that kind of hp are using 2 inch exhaust manifolds. The ramhorns are in my opinion the best flowing manifolds that GM has ever made. It seems that 2 1/2 inch would work fine, they would be much quieter in the cab and last forever. Probably cheaper than a couple of more sets of headers that you may need before you eventually sell your truck and you get to skip one installation __________________ 1967 C/K10 Chevy Panel 1968 C/K20 Chevy Pickup 1968 C/K10 Chevy Suburban 1941 Chevy Sedan Delivery 1960 Chevy Sedan Delivery 1972 Camaro SS 396 #s matching 1971 Harley FX Superglide



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11-28-2007, 05:41 PM	#16
Mondo Registered User Join Date: Aug 2007 Location: Bakersfield, Ca Posts: 538	Re: max hp with 2in ramhorns What year corvettes did the manifolds your talking about come from? I think I want to go that route but see different manifolds for different years...

11-28-2007, 06:46 PM	#17
BHRS Registered User Join Date: Sep 2007 Location: Wylie TEXAS Posts: 81	Re: max hp with 2in ramhorns They are not only used on old Corvettes. Look for 1962-1964 Impala's with a 300 hp 327-they came with the 2-1/2" rams horn manifolds. Also the alternator mounts to the manifold with a bracket from the manifold to the water pump. These engines had the double-hump heads with no accessory holes in the heads. Good Luck __________________ 1972 Cheyenne C10 Unrestored Original-3 Owner-RUST FREE Texas Truck Big Block-TH400-PS-PB-AC-AM/FM Radio

11-28-2007, 06:51 PM	#18
hotrodhomi Registered User Join Date: Apr 2004 Location: Sacramento Posts: 3,737	Re: max hp with 2in ramhorns This is by far the best deal I could find. If you can find a new set cheaper, jump on it. http://www.performanceexhaustplus.com/ Part number 674-504 Manifold - 1963-62 5.4L (327 CID) Corvette Ram's Horn, LH, 2-1/2" Dia. $57.45 Part number 674-503 Manifold - 1965-62 5.4L (327 CID) Corvette Ram's Horn, RH, 2-1/2" Dia. $57.45 Subtotal : $114.90 Shipping (Free Ground Service): $0.00 Tax : $0.00 Total : $114.90 __________________ '72 2wd blazer, bagged w/ watts link & EDC '72 C10 "Lowered Farm Truck" STOLEN 5-18-11 '66 impala ht

11-28-2007, 11:15 PM	#19
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Re: max hp with 2in ramhorns Go to www.partsamerica.com and look up manifolds for a '65 Corvette with 327 engine. They list them by Motormite and Dorman, for ~$80 each.

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