MikeM

If nobody checks it out, I'll look it up when I get back home after this big weekend. No books here. If I'm mistaken, I've been mistaken for decades.

6T5RUSH

I don't have the Chevrolet Parts Book. What I do have is strictly Corvette. Just a starting point. Here's a few pics from the 1953 thru 1982 CORVETTE Parts and Illustration Catolog, effective February, 1982.







DO love the prices

Jim
In God We Trust!

Pop Chevy

From what I remember that intake was worth about 10 hp over the squared off runners of the earlier intakes. Smoother flow is better.

DZAUTO

A little increment here, a little increment there, a few misc improvements here and there and it all adds up to a noticeable difference. And yes, some of these upgrades/improvements cost money, and some of them (if you're inclined to do your own work at home on the workbench) are free.
It is very true, these early Z28-LT1 manifolds have become rather pricey------------- BUUUUUUUUUUUUUUUUT, once in a while a gem is uncovered for cheap. You just gotta keep searching and paying attention. Over the years, I've made a few steals.
I have a total of 5 Z28 intakes and I think I have paid less than a TOTAL of $500 for them. One time at a swap meet, a guy was pulling parts out of his van (by the way, it was raining) and putting them on a table. He had just pulled out a Z28 intake and a pair of LT1 valve covers (the ones which are on the SB400 in my Chevelle). I asked what he was asking for them and he said he had not decided. I pulled out 2 $100 bills and offered them to him. He said he wanted more and I pointed out that I was offering him cash RIGHT NOW. He took it.

Patrick03

That's what I'm thinking DZ. Now that I know what to look for, I'll just keep my eyes open and wait patiently.

Thanks for all the great info everyone!

Patrick

DZAUTO

Also, always check Ebay and Craigslist--------------------you never know, someone's relative may be cleaning out a pile of parts and has no idea what is what!!!!

TJefferson2020

I've had people offer me $1000 for the intake. As if I'm going to tear down my motor for $1000. AND buy and install a different intake. WTF.

DZAUTO

The alum intake used on Chevelle and ChevyII engines of the mid-60s is TOTALLY different from the 67-72 Z28/Corvette LT1 intakes-----------------TOTALLY
As I've explained and posted pictures above, the MAJOR difference in Z28/LT1 manifolds is 67-68/69-72.
ALLLLLLLLLLLLLLLLLLLLL 67-69 manifolds are Z28 ONLY.
Then in 70, the (essentially) same manifold was used on BOTH Camaro Z28 and Corvette LT1 engines. BOTH of the 350 engines in the 70-72 Z28 and LT1 were (for all practical purposes) identical. The 70 LT1 in the Corvette was rated at 370hp and the Z28 engine in the 70 Camaro was rated at 360hp. Why the 10hp difference???? Much speculation has been given over the years, such as the more restrictive exhaust of the Camaro vs the Corvette exhaust which flows more freely, etc, etc, Who knows???????

Now, back to manifold differences. The 69-72 manifolds are 100% identical in EVERY way with one TINY exception.The 69 manifold has a hole up front for an oil tube. In production, this hole was plug with a welch plug, and oil was put in throuth the valve cover. The 70-72 version of this manifold has the area for the oil tube completely cast shut--------------------but it would easy enough to machine out the area to install an oil fill tube.

The 68(327)-69(350) Corvettes with a small block DID NOT, repeat, DID NOT have an alum intake manifold, they were cast iron----------------not even the 68 350hp/327 or the 69 350hp/350.
The last year for an alum intake on a SB was 67, THEN in 70-72, SBs got the hi-rise (Z28 style) alum intake.
I must admit it's kind of strange that in 67 there were TWO types of alum manifolds for SBs. For the 67 Vette with L79 and the Chevelle with L79 (NO L79 in 67 NOVA), there was the 3890490 intake (squared corners on runners), but the 67 Z28 got the totally different 3917610 hi-rise (highest ever factory SB manifold) manifold (rounded corners on runners).
Thus, in 1968 and 1969-------------THE ONLY FACTORY ALUM MANIFOLDS (FOR SBs) WERE THE 68-9 Z28 INTAKES!

SI67

No. A'68 350 horsepower 327 has a cast iron intake manifold.

SI67

Perhaps you mean Holley or Qjet. 1965 was the last Corvette model year to use Carters. The answer is Qjet.

solidaxel

Thanks for the ID and explaining the difference in the one that I have a trueZ28 3932974

MikeM

Yes, there were six L 79, '67 Novas built. Cast iron intake and Quadra-Jet.

Patrick03

@woof359, start your own thread. You've taken this way off topic and will get better responses of you start a thread focused on your concern.

Thanks,
Patrick

woof359

sorry

VetteRad

Does anyone know the height difference in the 65-66 intakes and the 69-72? I plan on going to a big block hood anyway, but just curious if the hood is a must prior to intake install with a original air cleaner on a 66.

solidaxel

I did have to change the air cleaner base because the Z28 uses a Holley not a AFB
I was also able to get it under the hood of my 62 using a different air cleaner element but the stock 62 cover

DucatiDon

The difference is minimal. Perhaps an 1/8th inch. I have one with an oem 65 air cleaner under the stock hood of my 63.

Mike C#2

Holley made an almost identical intake to the 69-72 and service replacement Z/28 intake, part # 300-36. There is also a cast iron version of the Z/28 intake that was found on marine engines with a quadrajet carb pattern. They are available with the pre-86 bolt arrangement or the post ‘86 and pre-vortec manifold bolt arrangement. This is a great street intake if you don’t mind the weight… I picked one up last summer for $50 which is a bargain compared to the numbers bantered about for a Z/28 intake. The non-air gap Performer RPM works in a pinch as well.