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QParker 06-14-2010 01:18 AM

292 chevy l6 advice
 
Does anyone know if there is a 292 stroker out there? or another straight 6 crank that would increase stock stroke?

I want to make this engine as strong as I can on a budget, but still have something I can depend on. Give me some suggestions on a cam, intake (4BBL or 3 carb), compression, Should I mill the head or buy pistons, ect.
I'm shooting for at least 300+ HP~ 1HP per CI
I want a good daily driver that can occasionally burn rubber, but I don't want to go the SB route just because everyone has one and I want to stand out a little. I've seen 292's that can easily do a 10 sec 1/4 mile... OH, this is replacing the stock 216 from a 1949 chevy 3/4 ton pickup

CNC-Dude 06-14-2010 10:09 AM

I was recently involved in a very thorough 292 dyno test over on Inliners. We tested (8)different cylinder head combos in various stages of porting and valve sizes. 300 HP will be very easy for you to achieve. We started with a bone stock 292 to establish a baseline, and even in bone stock trim(160 HP) yielded 300 ft. lbs of torque right from the 1800-2000 RPM on up in a straight line across the RPM range. All of these tests were done with a "pump gas" compression ratio of 8.8-1, and all parts were off the shelf components. The best HP combo was with a Clifford intake and a 4 bbl Holley carb, and all combos were still easily streetable, this combo also yielded 330 ft.lbs also. Stroking isn't necessary, and any rod other than a stock one is going to have to be custom($$$$), since it shares absolutely nothing in common with any other engine to do a swap with. Plus the bearing journal overlap on the crank is not very good on the stock crank anyway, and stroking it is only going to reduce it futher. I've built many of these engines for Comp Eliminator guys and have made over 600 HP with the 292 N/A, so you have plenty of power potential without having to stroke it. There is a guy on Inliners right now that has a Turbo 292 in his race truck that makes over 700 HP/800 ft lbs of torque, so there is plenty of ways to go to get power out of these engines.

The main key to power in these engines is in the head prep. You will have to consider large valves(1.94 intake) and removing the intake port bolt bosses and installing some bolt-in lumps. You can easily increase the flow from the stock port with 160-ish CFM with a 1.72 valve, to around 270 CFM with a 1.94 valve by doing this simple modification. Race heads can be made to flow 330+ CFM with even larger valves and more aggressive porting.

oldbogie 06-14-2010 11:25 AM

Quote:

Originally Posted by QParker
Does anyone know if there is a 292 stroker out there? or another straight 6 crank that would increase stock stroke?

I want to make this engine as strong as I can on a budget, but still have something I can depend on. Give me some suggestions on a cam, intake (4BBL or 3 carb), compression, Should I mill the head or buy pistons, ect.
I'm shooting for at least 300+ HP~ 1HP per CI
I want a good daily driver that can occasionally burn rubber, but I don't want to go the SB route just because everyone has one and I want to stand out a little. I've seen 292's that can easily do a 10 sec 1/4 mile... OH, this is the stock 216 from a 1949 chevy 3/4 ton pickup

Pick up a copy of Santucci's book "Chevrolet Inline Six-Cylinder Power Manual". This is a super good read for anybody looking to the Chevy inline 6 for power. Reviews at at Amazon, http://www.amazon.com/Chevrolet-Inli.../dp/1931128154

As CNC said and as you'll read, the trick, or at least a big trick is in the head. Years ago we were happy with taking out the boss in the middle of the intake passage. As you'll see in the book, Kay Sissel came up with a gadget to change the contour of port floor to give a better entry on the short side radius to the valve.

Always think of the piston as part of the combustion chamber as with any engine build. Squish and quench are friends that let you run more compression per octane of fuel you're buying. While a lot of configuration details come into play making it hard if not impossible to predict the engine's ability to control detonation, the general rules are to keep the squish/quench deck with a steel rod in the range of .040 to .060 inch at TDC. If you need to increase volume above the piston use a piston that is dished only under the valve pocket, do not use pistons with circular dishes. If you can, use a flat top piston, if you must reduce chamber volume use a dome but as little of that as possible. If you use a domed piston, Singh slots cut into the piston rather than the head are useful for getting the flame front over the dome.

300 hundred horse from a 292 is easy to accomplish. Once the head and piston selection is set up, like any-other engine, it comes down to the cam, carbs and exhaust. balance and damping on the front of the crank are important to get an inline to live a long time at high power outputs. In line blocks are not as stiff as V design blocks, so keeping odd moments of inertia from developing on the crank to be transmitted thru the bearings into the block is an important undertaking for long term reliability. In lines tend to be sensitive to crank harmonics, so damping of vibrations is of significant importance.

Bogie

QParker 06-16-2010 02:17 AM

Can anyone recommend a mild cam for the 292?
How would the Clifford 264 cam be? Here's the specs on it:

*Our 264 cam is ground at .206 @ .050 with a big valve lift os .518. This is .112 higher valve lift than stock. Stock being .406 valve lift.

geezer69 06-16-2010 05:58 AM

the 292 had the et record for I-6'ers in the late 60's and early 70's. built in durant okla. by mr. self.some of the older folks will remember him.he started with the chevyII and later went to the camaro. they were dang fast.

CNC-Dude 06-16-2010 10:22 AM

Quote:

Originally Posted by QParker
Can anyone recommend a mild cam for the 292?
How would the Clifford 264 cam be? Here's the specs on it:

*Our 264 cam is ground at .206 @ .050 with a big valve lift os .518. This is .112 higher valve lift than stock. Stock being .406 valve lift.

That Clifford cam is a good one, but you'll still be a long way away from your goal of 300 HP with it. You will also have to do some pretty extensive head work also to help get you to your goal HP as well. A Clifford intake will also be helpful, the Offy intake will fall short of getting you there also. A set of long tube headers with 1-5/8" primary tubes will help too.

QParker 06-16-2010 01:19 PM

I am going to lump port the head, install 1.94 int. and 1.50 exh. valves in it.
How would the solid lifter "EP-22/25" cam work?
Here it is:
http://www.englecams.com/downloads/...gle_catalog.pdf

QParker 06-16-2010 09:13 PM

How much power could I get from the 292 while still keeping it streetable with a mild cam and keeping the RPM's below 6000?
Everyone talks about HP, but if I have a 300-350HP 292 what would the torque be? That's what these engines are famous for, Right?! :thumbup:

CNC-Dude 06-16-2010 09:22 PM

One of the best combos we recently dynoed made 330 Ft Lbs of torque and was 300 HP. The RPM was well below 6000. The torque curve was almost a straight line from 2500 to 4200 or so. I looked at the Engle link, but didn't which grind you were meaning specifically. I'll look back at some of the dyno sheets and see what cam we used for the best peak HP and TQ #'s we got.

a1supersport 06-16-2010 09:23 PM

Quote:

Originally Posted by QParker
...what would the torque be? That's what these engines are famous for, Right?! :thumbup:

Excellent stump-pullers, especially when coupled with a SM465 (compound-first). Had two pickups with that combo. Now that I look back on it, I regret giving one truck away, and repl. the 292 in the other, with a 350...

QParker 06-16-2010 09:43 PM

Thanks everyone, big help

Sufprog 04-30-2013 02:11 PM

292
 
I just posted one on Craigslist ?

gearheadslife 04-30-2013 03:49 PM

I'd think an 292 as is(solid rebuild) with a blow through turbo, or efi..
would get you over 300hp and enough torque to rip the tires off..

vinniekq2 04-30-2013 09:08 PM

cnc 292 N.A.=600 hp?
 
Quote:

Originally Posted by CNC-Dude (Post 1277343)
I was recently involved in a very thorough 292 dyno test over on Inliners. We tested (8)different cylinder head combos in various stages of porting and valve sizes. 300 HP will be very easy for you to achieve. We started with a bone stock 292 to establish a baseline, and even in bone stock trim(160 HP) yielded 300 ft. lbs of torque right from the 1800-2000 RPM on up in a straight line across the RPM range. All of these tests were done with a "pump gas" compression ratio of 8.8-1, and all parts were off the shelf components. The best HP combo was with a Clifford intake and a 4 bbl Holley carb, and all combos were still easily streetable, this combo also yielded 330 ft.lbs also. Stroking isn't necessary, and any rod other than a stock one is going to have to be custom($$$$), since it shares absolutely nothing in common with any other engine to do a swap with. Plus the bearing journal overlap on the crank is not very good on the stock crank anyway, and stroking it is only going to reduce it futher. I've built many of these engines for Comp Eliminator guys and have made over 600 HP with the 292 N/A, so you have plenty of power potential without having to stroke it. There is a guy on Inliners right now that has a Turbo 292 in his race truck that makes over 700 HP/800 ft lbs of torque, so there is plenty of ways to go to get power out of these engines.

The main key to power in these engines is in the head prep. You will have to consider large valves(1.94 intake) and removing the intake port bolt bosses and installing some bolt-in lumps. You can easily increase the flow from the stock port with 160-ish CFM with a 1.72 valve, to around 270 CFM with a 1.94 valve by doing this simple modification. Race heads can be made to flow 330+ CFM with even larger valves and more aggressive porting.

what CFM rating did that head have?

CNC-Dude 05-01-2013 12:32 AM

Vinnie, the head was right at the 270 CFM mark,this is what most anyone can achieve when they install the bolt-in lumps and 1.94" valves along with basic mild porting.


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