I6 292 help

[wishingbig]

Hi, I have a 67 c10 with a 292 from a 1980 dump truck so the notes say. So far I've only put Heddman headers on it. Next will be a new intake, so that leads me to a few questions if you gentleman wouldn't mind. I'm newer to the motor end of work. Done body work here and there so figured time to learn new.

Should I change out to a different carb? Looked at a few but not too many are manual choke. And I don't know what size to go, read some people suggested 650cc's but I'm not running anything special.

Cam grinds, without doing any piston or valve work should I even bother?

Thanks in advance.

[70cst]

Here is a bump for you for those who have more knowledge on this engine than I

[wishingbig]

Bump.

[69chevy lwb]

If it's from a 1980 then it's an integrated head and you can't replace the intake. Check that before you throw any money at it. You don't need a 670 carb on one of those. I wouldn't go over 400 they never get revved up so they don't flow much. If you're looking for performance get a set of lump ports and a torque cam and you will have a motor that runs forever and has plenty of power to go down the road.

[Wrenchbender Ret]

The intregal head was not used on 292 engines.

['68OrangeSunshine]

I like the Offy intake and a 4 barrel. Currently I'm running the Edelbrock 1404 [manual choke], 500CFM. I have Clifford headers, long tube-types.
I have also run the Holley R8007, 4160, 390 CFM [converted to manual choke]. A good carb, but I think they're finicky. I did get 25 years and 250,000 miles out of it though.
If your 292 came out of a dump truck, you likely have the 3-stud
L6 factory cast iron exhaust manifold. They say those flow better than the 2-stud manifolds they put on light trucks. The Offenhauser intake will mate with factory exhausts. Clifford's manifold will not. The stock '80s intake may have a 2 barrel or Monojet.
On my current L6 292 build, it's bored .030-over, Badger cast pistons, Crane 260H cam, 1.84" intake stainless valves [stock 307 V8], 1.5 exhaust, hardened seats, in a '68 C/10 Stepside with SM465 4-speed to 12-Bolt Corp rear @ 3.73 and Eaton Posi.

[wishingbig]

Thanks!

Curosity what size are the bolts/nuts that hold headers/intake on? Or any bolt kits sold anywhere don't have any nuts that fit and I lost two nuts somehow.

[zeeklu]

I have the 390 Holley on my 292 and it runs well. It was hard to tune though.

[88Ironduke]

Tom Langdons Stove Bolt Chevy site is a good source for information. They also list a carb adapter plate and new style Weber carb set up. Never seen one of carb setups in person but they look pretty good. I'm on board with new carbs versus rebuilds in most cases. Just another option.

88Ironduke

[PanelDeland]

You might also want a copy of Leo Santucci's book "Chevrolet Inline six Power manual"
Lot's of good six cyl info in it.

['68OrangeSunshine]

Originally Posted by wishingbig

Thanks!

Curosity what size are the bolts/nuts that hold headers/intake on? Or any bolt kits sold anywhere don't have any nuts that fit and I lost two nuts somehow.

I'm pretty sure they're 3/8''-16 UNC. A common size. That's the size of the manifold boltholes in all stock applications.
Studs [an aftermarket upgrade] are 3/8-16 on one end and 3/8-24 on the other. The fine-threaded end on the studs holds headers on better with a nut. Grade 8 or stainless is preferred.

[wishingbig]

Originally Posted by '68OrangeSunshine

I'm pretty sure they're 3/8''-16 UNC. A common size. That's the size of the manifold boltholes in all stock applications.
Studs [an aftermarket upgrade] are 3/8-16 on one end and 3/8-24 on the other. The fine-threaded end on the studs holds headers on better with a nut. Grade 8 or stainless is preferred.

Thanks much sir! Ideas are set. Gonna get some parts off of Clifford Performance.

['68OrangeSunshine]

No problem, my friend. I concur with Panel Deland on reading Leo Santucci's book. It's my reference source.