Curious why all the heads i see don't have accesory holes ? Thinking about swapping out my smog heads,what improvement could i expect.
Motor has mild cam ,no cat ,true duals.

TIA

 

Early camel-humps (pre 69) had no accessory holes. Available with 1.90 or 2.02 intake valves. Your only improvement would be a small bump in compression, maybe 10 to 15 H.P. Compared to todays aftermarket heads....they are low performance. Worked Vortec heads are light years better.

 

I'm trying to do a low cost mod .
Wife would have a cow if i went with alum, at least till she drove it

 

Vortec cast iron heads are reasonably priced.
http://www.sdpc2000.com/catalog/2172...-Head-Kits.htm

 

What would a set of Vortech run? Don't these require a manifold?

 

Yes you will have to change intakes and valvecovers. The 69 or 70 double humps do flow much better than the smog heads. They have larger intake runners and have accessory holes. They are also 64 CC instead of 76 CC. They will bump your compression 1.4. A 9:1 compression ratio changes to a 10.4 to 1 ratio with the head change. I got 2 double hump heads that are cores to build. They are matching 186 castings with accessory holes. Dates don't match each other, one had 2.02 valves with screw in studs. the other had 1.94 valves with pressed in studs. To use them you will have to buy a set of 2.02 1.60 valves. Valve springs and retainers, guide plates, Screw in studs, pull the press in studs and tap the holes on the one head and have them ground to accept the new valves and new guides installed. This is not much more than a valve job and some minor machine work. The Double humps with accessory holes are hard to find now as everybody has been doing this for the last 35 years to get some performance out of the 71 and newer engines. Will sell mine for $200 plus shipping and I will have them magnafluxed. I have a Brand new in the box set of comp cams dual springs with 10 degree retainers and locks I will sell for $80 with them. It will look stock and run much stronger. Just thought I would throw it out there as an option. I am in IL so shipping won't be to bad, $40 or $50. I have sold the other 2 sets of cores I had with matching date codes already. 1 set for $525 and one set for $425. These don't have matching dates so they are cheaper.

 

Thanks for the info , i will get back to you on the heads.

 

We have 64 corvette Fuelie(camel hump) heads, on our one impala with a 327. I was thinking about swapping them into my car for now, but my dads friend mite sell me new vortec heads he bought but didtn use. I would like to buy the trickflows but there to much money, i am on the same boat, im going to look for low price cast heads for mine too. I have stock everything right now.
But i do have a new cam sitting in my room just waiting to see the road. (lunati vodoo 468/489" lift)

 

I bought my car with a set of double hump heads already installed. 10 years ago that was the hot mod besides expensive aftermarket heads. Now a set of worked over Vortec heads are so much better than the humps and half the price of a set of aluminum heads. Edelbrock even makes a set of aluminum heads modeled on the Vortec design. I use to know all the specifics of the Vortecs, but have since forgotten. I do remember the early versions can't be worked over as easily as the later ones.

 

Camel hump heads can be modified to work fine and give good power. My mild 331 CI, 9.5:1 CR puts down 300+ hp to the rear wheels (measured at 293 hp on the chassis dyno before further modification and a Lars tune-up).

 

Buying a set of camel hump heads in good condition, ready to bolt on, for $200 or less would be ok. If they needed valves, guides, seats recut, etc.. pass on them. By the time they would be in a usable condition a set of brand new Vortecs can be purchased that will outflow and outperform the camel humps.

 

vortec heads are great. My set cost me 700.00 at my door w/2.02, 1.60 SS valves. I also had screwin rocker studs w/plates installed. The valve guides cut to take 750 lift cam, springs for a roller cam installed. I have tried several different heads NOTHING came close to the votrec heads. You can get a new manifold on FleeBay for about 129.00.

 

I will buy all the double hump heads in good condition, ready to bolt on, with accessory holes for $200 that you can get me. Especially since I have sold 2 sets of cores in the past month, 1 set for $525 and the other for $425. Send me the ready to bolt on double humps for $200 a set. I will buy them all.

 

Exactamundo!
Why spend $425-$525 for a set of outdated heads when brand new heads that will deliver better performance cost about as much?

There will be a need for these for those doing a restoration.
There are some people who think old school stuff is best compared to todays product.
And there are still some others who just don't know any better.

As long as you got buyers who are willing to buy them, what's the big deal?

 

No big deal. GMPP are still selling this identical head with different casting numbers so they must not be too outdated . These were on engines that were rated conservativly at 370 HP. from the factory and if properly ported well over 600 hp on the strip. I think you are under rating these heads especially for the guy who wants to maintain a stock appearance and add quite a bit of power to a smog head low compression engine. I don't think there are to many sets of these with accessory holes floating around for $200 ready to bolt on. Maybe I fall into the group that just don't know better. As for the people that think old school stuff is best compared to todays product I would say the majority of C3 owners would fall into that category or they would be driving a C5 for the same money or considerably less than their pride and joy. The heads I have already have been spoken for by a fellow CF member that read the original post. I was just offering a fellow forum member what he was looking for at a fair price.