Rams horn manifolds

[70K10Hunter]

I thought I saw one time a set of Rams horn manifolds that would accept an A/C compressor, but I believe they were for the 67/72 models. Would they work for a 73/80 with an A6 compressor?
Does anybody know where I could acquire a set?
if in fact they do.

[andyh1956]

I bought a new set of 2 1/2" Chicom Rams Horns at Pate this yr & they both have the bracket on them to mount something, A/C comp or wind mill I don't know...

[Malo83]

How about these?
http://www.speedwaymotors.com/Corvet...fold,9133.html

[MikeB]

The bracket on the 2.5" models is for a mid-1960s generator.

For a pickup you really need the ram's horns with angled outlets to clear the crossmember. However, I don't know if they would clear your compressor, since they rise up much higher than the 73-87 "log type".

Dorman 674201, left side (Right side is 674199)

[70K10Hunter]

thanks guys. Upon further investigation I noticed that my A/C comp has a rear support mount which bolts between the 2nd and 3rd bolt hole and the Rams horn ain't gonna make it. So I guess its the log style or maybe some headers and make spacers for the rear support.
Gotta have my A/C it is Texas you know.

[72freak]

Originally Posted by MikeB

For a pickup you really need the ram's horns with angled outlets to clear the crossmember

This is a common misconception. Straight dump 2.5 ram horns clear fine. I put them on every 67-72 I built over the past 20 years. 2x4, 4x4. Now with that said, the kick backs do allow for less of a bend at the start of the exhaust pipe and i will certainly give them a try on one of my next builds!.

[MikeB]

Originally Posted by 72freak

This is a common misconception. Straight dump 2.5 ram horns clear fine. I put them on every 67-72 I built over the past 20 years. 2x4, 4x4. Now with that said, the kick backs do allow for less of a bend at the start of the exhaust pipe and i will certainly give them a try on one of my next builds!.

Interesting. I had a pair of the 2.5" Dormans that would have required a very tight radius bend on my old 69 C10. I am partial to large mandrel bends, and doubt one could be made that tight. The larger the radius the better! However, those manifolds would have worked on a K10, because the engine was mounted farther back.

On my 82 C10, I might have been able to make them fit had I notched the motor mount clam shells, but would have had the same issue with the tight bends.

If the OP needs manifolds, I have these sitting on the shelf. They're for a 96-up 350. I used them on my 82 C10 for a year or so before I switched to headers. What I like about them is they don't have air injection ports. The stub pipes and flanges are 2-1/4".

[GMDad]

Originally Posted by MikeB

Interesting. I had a pair of the 2.5" Dormans that would have required a very tight radius bend on my old 69 C10. I am partial to large mandrel bends, and doubt one could be made that tight. The larger the radius the better! However, those manifolds would have worked on a K10, because the engine was mounted farther back.

On my 82 C10, I might have been able to make them fit had I notched the motor mount clam shells, but would have had the same issue with the tight bends.

If the OP needs manifolds, I have these sitting on the shelf. They're for a 96-up 350. I used them on my 82 C10 for a year or so before I switched to headers. What I like about them is they don't have air injection ports. The stub pipes and flanges are 2-1/4".

Were you able to use the stock pipes from an 82 with these manifolds? I am going to replace the 305 I my 86 and want to remove injection pump etc and those manifolds looked really good on yours.

[MikeB]

Originally Posted by GMDad

Were you able to use the stock pipes from an 82 with these manifolds? I am going to replace the 305 I my 86 and want to remove injection pump etc and those manifolds looked really good on yours.

No, I modified the head pipes in a 73-87 Heartthrob Exhaust kit using extra pipes and mandrel bends that were included for long wheelbase trucks. But any muffler shop can make the connections.

96-up trucks use a Y pipe with CATs and probably wouldn't fit an 73-87 anyway.

[54Caddy]

N2trux has a set of 2.5 ram horns on his truck

[mcmlxix]

I have a factory 2wd 78 Blazer and asked a friend to swap some 2.5" ram horn manifolds from the old headers. I was in the process of moving so it would have been a perfect time. He came back a week later and said they wouldn't fit.... They were Speedway Motors smoothie that dump straight down...

[MikeB]

54Caddy -- That is a very nice installation, at least on the passenger side. Do you know if he had to notch the driver side clam shell to clear the manifold flange?

And I wonder what the driver's side head pipe bend looks like. On my 82 C10, it would have been a severe bend starting right at the flange to clear the crossmember.

[54Caddy]

No he says in thread that he didn’t have to notch motor mounts. Passenger side he did change to a mini starter since OEM style was bad so I’m sure that helped with clearance a bit. Drivers side I’m sure has a crazy bend to it but that’s all just in finding an exhaust shop that knows what they’re doing.

[kacy]

anyone have these on their stock height 4x4s?

[N2TRUX]

Originally Posted by MikeB

54Caddy -- That is a very nice installation, at least on the passenger side. Do you know if he had to notch the driver side clam shell to clear the manifold flange?

And I wonder what the driver's side head pipe bend looks like. On my 82 C10, it would have been a severe bend starting right at the flange to clear the crossmember.

Originally Posted by 54Caddy

No he says in thread that he didn’t have to notch motor mounts. Passenger side he did change to a mini starter since OEM style was bad so I’m sure that helped with clearance a bit. Drivers side I’m sure has a crazy bend to it but that’s all just in finding an exhaust shop that knows what they’re doing.

Roger Lynsky of RPL built a custom Y pipe and we ran a single 2.5" pipe back to a large mouth CAT followed by a SI/SO Flowmaster with a tailpipe that ran to the rear of the truck. There were no clearance issues, and no crazy bends in the pipe. The sound was nice a smooth till you nailed it and then it talked nasty.

Later when we installed the 4 link, I had to cut the system shorter to clear. Now its just loud, and doesnt sound as clean. I plan to make changes to that soon.

[mcmlxix]

So I have a 78 factory 2WD with a SBC. I used a late model factory mini starter. I have a serpentine belt setup so I should be OK with the ram horn manifolds?

Would you recommend studs for the manifolds? Have a part number? I would guess Dorman should make some...