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Old 09-20-2018, 03:39 PM   #1
Smokintire70
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'66 CamelHump Head swap from Vortec RamJet

I might be able to snag a pair of camel humps. I was reading some specs ( below) and I don't know how far I can hog out the runners before having to move the pushrod holes. I have never ported a set of heads and am on budget so its DIY for me. Which is totally ok, I enjoy working on my own and don't mind the time or work (just works on my patience...I hope).

I TEND TO GO ON MUCH PAST THE POINT THATS NEEDED SO IF YOU WANT THE BASICS SKIP DOWN TO THE 4TH PARAGRAPH.

......SO HERES THE GRITTY INFO...... I am running a RamJet 350, basically a 2 bolt 1998 OE Roller block w/o a mech. fuel pump. I am thinking of running a XR294HR with new pushrods, springs, valves etc. and I have a Team G Wieand single plane that I am going to run a 750 Vac. Secondary (3310-6) on. HERES the problem. I don't wanna re-drill a intake that might not be a long run item. plus the vortec heads are center bolt cover and are difficult to find a used intake for. I am also trying to get more period correct and get some budget power. Down the road I am going to put a 383 kit in it and the throttle body that flows 440 CFM to a 383 with a big old "bump-stick" wont be anywhere near enough.

BAISCS: I run a Ram Jet with vortec heads that I don't want because of the intake and how little it flows. So the camel humps that I am trying to obtain have about 170cc intake runner that I want to port as much as possible, so what Im wondering is would you stick with the 62cc chamber 1.94/1.50 vortec heads that have an unknown runner size, (i cant find the specs and I dont have the casting number on me now I will add it in later.) or should I go with the pretty 'ol camel hump heads that I can stick a 2.02/1.60 valves and port the intake and exhaust. I am using a Vac. Secondary 750 on a single plane that is drilled for the pre '86 heads. Which head, what mods? Cheers.

462---------------------- 291-----------------
Intake Exhaust Intake Exhaust
Valve Dia. 1.94 1.5 1.94 1.5

Stem Dia. 3.43 3.43 3.43 3.43

Throat Dia. 1.59 1.305 1.59 1.305

Seat Angle 45 45 45 45

Port Volume (cc’s) 171 75 171 76

Avg. Port Width 1.074 1.303 1.092 1.322

Avg. Port Height 1.927 1.405 1.950 1.373

Port Length 5.0445 2.506 4.899 2.546


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Old 09-20-2018, 04:42 PM   #2
Warrens69GMC
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Re: '66 CamelHump Head swap from Vortec RamJet

Save your money. Even the ported 461 casting won't be good on a healthy 383.

Seriously, grab a pair of AFR 195's for the 383 and leave the old school castings alone.
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Old 09-20-2018, 06:37 PM   #3
Smokintire70
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Re: '66 CamelHump Head swap from Vortec RamJet

got home and checked the casting. its a 906, still havent ben able to find the runner volume but Im gonna need somthin more than 180cc. Reason I brought this up is that IF i were able to get the heads, it would be for free, as the truck would be parted or scrapped and in that case I already have a nice intake to put on it instead of buying a vortec specific one. So besides the porting issue i have all other parts nessicary to do the swap once the heads are in my posession. and I wouldnt have to spend another 250 bucks to get another intake. Do you happen to know how heavily the camelhumps can be ported?
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Old 09-20-2018, 11:40 PM   #4
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Re: '66 CamelHump Head swap from Vortec RamJet

In stock form the Vortec heads will out perform a stock set of 461 casting heads. IMO, unless you know just where and how to port a set of small block heads and also have access to a flow bench to track your changes, you are just wasting a lot of time. If it were me, I would concentrate my efforts elsewhere to generate funds to be able to afford to purchase a decent set of aftermarket heads that will actually flow some decent numbers for a 383. Selling both sets of heads should get you a start of the budget for a set of heads. While AFR heads are pretty much the best heads available, there are other less expensive heads that will out of the box perform better than a set of ported 461's.
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Old 09-21-2018, 11:55 AM   #5
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Re: '66 CamelHump Head swap from Vortec RamJet

Just a couple of things. Port volume does not equate to flow. What you need to decide is this. Where do you need the motor to make power and really torque at. Porting any head id not a DIY project with out the proper tools, a flow bench and a good knowledge of what improves flow and where you need the flow to make the power you are after. If you need great power (what you feel with your butt in the seat) from 1500 to 5500 flow and velocity in the port is important at a lower lift. If the motor needs it from 5500 to 7500 then thats another thing. A big bump stick with a head ported in all the wrong places can be a first class pig and not make power at all. Take some time a learn a bit about what makes power and where and hook up with a good local engine builder. You will need em when you do the 383so may as well get started now.
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Old 09-21-2018, 12:22 PM   #6
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Re: '66 CamelHump Head swap from Vortec RamJet

First off thank you guys. And I want this to have mid- high end. The damn thing runs to 5,200 rpm and its pretty lame. I bought 4.11s from the 3.08s and am getting a posi shipped in soon. that alone will change alot, especially since it has 33"s on it. but I want a little different curve. Im looking at machine shops near me. thanks a bunch!!
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Old 09-21-2018, 01:51 PM   #7
mattfranklin
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Re: '66 CamelHump Head swap from Vortec RamJet

I'm using the camel hump/fuelie heads for retro appearance, but if I were going for performance I'd go for the Vortec heads.
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Old 09-21-2018, 02:13 PM   #8
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Re: '66 CamelHump Head swap from Vortec RamJet

Not sure what good machine shops are in the Santa Rosa area, but I'm lucky enough to be close to Morgan's Machine & Marine in Walnut Creek. Tim Morgan really knows these heads (and knows most any head from common to exotic Italian) and has done excellent work for me. I've heard he can be a little cantankerous at times, but he's a decent hardworking guy who does high quality work. More expensive than production shops who rush through though. But not a ton more expensive.
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Old 09-21-2018, 02:23 PM   #9
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Re: '66 CamelHump Head swap from Vortec RamJet

I ported a set of 462"s (2.02/1.60) back in the late 80's myself and it was alot of work. This was a street sbc 355 in my 67 chevy II. Not any cheap after market heads back then. With a Isky 602 roller (260@50) and 800 holley it ran out of breath at 6700 rpm. I ended up back halfing with ladder bar set-up (bigger tires) Car ran a best of 10.74/125. They did work back in the day.
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Old 09-21-2018, 03:06 PM   #10
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Re: '66 CamelHump Head swap from Vortec RamJet

Well ported camel hump heads are at or maybe just slightly more flow then stock vortecs, and so completely not worth the effort and money. Why in the world do you want to go backwards?
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Old 09-21-2018, 09:27 PM   #11
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Re: '66 CamelHump Head swap from Vortec RamJet

Trash them. Camelhump heads we're ok....like 50 years ago. Not worth the time or effort.
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