[Tim Corcoran]

OK this is not about a Pontiac Engine, but there are some things of interest here and some related to a Pontiac engine build. There is an article on this engine in the December issue of Hot Rod Magazine.

The GM crate engine makes 1,004HP and is designed to be a street engine. This is the same engine that is used in the 2024 COPO Camaro. It has 12.0:1 compression and is designed to work on 93 octane pump gas, huh? It's made at the GM Performance and Racing Center in Pontiac Michigan.
It has a custom ground Comp Hydraulic Roller cam made to GM specs using Chevrolet Racing anti-pump-up Bowtie lifters secured in place with a “spider” hold down plate. Looking at the design of the spider plate I see no reason why one couldn’t be fabricated for a Pontiac, but it would be expensive and doubt there would be enough sales to make it a profitable venture. It would require some expensive tooling to make the stamped sheet metal portion. The dog-bone portion appears to be made from 3/16 plate or cast then braised or spot welded to the stamped sheet metal. The stamping acts as a spring to hold the dog-bones in place to prevent the lifters from rotating.
The valve springs are ovate wire beehive to control the big 2.450 intake and 1.8 exhaust titanium valves with .780/.782 lift and 175 pounds on the seat and 410 pounds over the nose. The redline is 7,000 RPM and max power 1,004 @6,600.
Another interesting aspect of this engine is the use of coatings on the piston top and all exterior of the piston. I suppose the coating on the top is to retain heat in the combustion chamber inside of the large 32.3cc dish and on the exterior to reduce friction and for durability. It uses Cometic .040 MLS head gaskets and the pistons are .005/.006 in the hole.
I also found it interesting that it uses 15W 50 oil with bearing clearance of .027/.028 on the mains and .0023/.0028 on the rods.

[Bill Hanlon]

Originally Posted by Tim Corcoran

with bearing clearance of .027/.028 on the mains and .0023/.0028 on the rods.

Did you miss a zero on the mains??? 27 thousandths seems a bit wide to this amateur.

[steve25]

Thanks for this review!

Well this could certainly be done with a Pontiac, and yes it would take very deep pockets.

We do have a block that will make that amount of cid.

That amount of valve lift for a street motor gives me white knuckles so I would prefer a solid roller over a hydro roller.

I think that to get the level of air flow needed to make over 1000 Hp at only 7000 rpm that one would need valves that size like they used.

With the bore spacing of
our motors I think running a Hemi type head to get those needed valve sizes would be the only way to go.

I think that with any motor built like this and run on the street the main issue will be valve spring longevity.

I would be surprised if some of them did not start to go south by the time you racked up 4000 miles .

[grandam1979]

That would be a awesome engine to have. It’s probably $30,000.00

[Half-Inch Stud]

6,600 rpm to make 1,000 HP NA is darn good.

[i82much]

could go this route and save 8k ...

https://www.shafiroff.com/chevy-pump...isted-sr20.php

[AG]

Originally Posted by i82much

could go this route and save 8k ...

https://www.shafiroff.com/chevy-pump...isted-sr20.php

I'd rather have that one.

[Steve C.]

The type of hydraulic lifters in that block could not be used in a Pontiac block...a FWIW

[ponjohn]

Originally Posted by steve25

Thanks for this review!

Well this could certainly be done with a Pontiac, and yes it would take very deep pockets.

We do have a block that will make that amount of cid.

That amount of valve lift for a street motor gives me white knuckles so I would prefer a solid roller over a hydro roller.

I think that to get the level of air flow needed to make over 1000 Hp at only 7000 rpm that one would need valves that size like they used.

With the bore spacing of
our motors I think running a Hemi type head to get those needed valve sizes would be the only way to go.

I think that with any motor built like this and run on the street the main issue will be valve spring longevity.

I would be surprised if some of them did not start to go south by the time you racked up 4000 miles .

What?

[blueghoast]

Spring tech has come a long-long way.

GT

[Dragncar]

That BBC has a 2.40" valve. I am sure that head has a ridiculous amount of flow we could never have.
4.75 stroke with a 4.60 bore.
Must be nice, still a freaking Chevy.

[Stuart]

Besides the article in the current Hot Rod magazine, there are also several previous stories about the ZZ632 available on the Motor Trend website that go into detail on how it's built and how the heads were designed. https://www.motortrend.com/s/zz632/

[77 TRASHCAN]

As Smokey Yunick once said, Looks like a 200 pound Marilyn Monroe....

[Stan Weiss]

Originally Posted by steve25

We do have a block that will make that amount of cid.

.

Originally Posted by ponjohn

What?

Wasn't there a run of tall deck height Pontiac Blocks?

Does anyone remember what their deck height was?

Stan

[Stan Weiss]

Originally Posted by Dragncar

That BBC has a 2.40" valve. I am sure that head has a ridiculous amount of flow we could never have.
4.75 stroke with a 4.60 bore.
Must be nice, still a freaking Chevy.

2.45" intake valve - 1.80" exhaust valve

Stan

[Dragncar]

Originally Posted by Stan Weiss

2.45" intake valve - 1.80" exhaust valve

Stan

???

[Gach]

Stevie…. Dream on if you think any Pontiac motor configuration can make 1050 hp on pump gas.
For $23,000.00 never gonna happen

[Stan Weiss]

Originally Posted by Dragncar

???

Troy,
Not sure what that is from but not the ZZ632. Just look at post #1 or below.

Stan

ZZ632/1000 DELUXE TECH SPECS

Part Number: 19432060
Engine Type: Chevy Tall-Deck Big-Block V-8
Displacement (cu. in.): 632 cu. in.
Bore x Stroke (in.): 4.600 x 4.750 in.
Block: Cast Iron Bowtie with 4-bolt main caps-tall deck
Crankshaft: Forged 4340 steel
Connecting Rods: Forged steel H-beam 6.660"
Pistons: Forged aluminum 2618 alloy
Intake Manifold: Aluminum high-rise single-plane
Throttle Body: 4500-style
Fuel Injectors: 86-lb/hr
Camshaft Type: Billet Steel Hydraulic Roller
Valve Lift (in.): 0.780 intake/0.782 exhaust
Camshaft Duration (@0.050 in.): 270º intake/287º exhaust
Cylinder Heads: Aluminum spread-port; 70cc chambers -RS-X design
Valve Size (in.): 2.450 intake/1.800 exhaust,Titanium (5/16-in stem OD)
Ignition Type: 58X crank-triggered, coil-near-plug
Compression Ratio: 12.0:1 (nominal)
Rocker Arms: Forged aluminum; roller-style
Rocker Arm Ratio: 1.8:1 (shaft-mount)
Water Pump: Aluminum
Oil Pan: Steel 8-quart
Recommended Fuel: Premium pump (93 octane or higher)
Maximum Recommended RPM: 7,000
Balanced: Internal

[b-man]

Bill Creech (WDCreech) has a 606-cube tall deck IA in his ‘64 GTO race car so it looks like you can build a 600+ inch Pontiac.

A 4.39” bore and 5” stroke would get you 605.4 inches.

[Dragncar]

Originally Posted by Stan Weiss

Troy,
Not sure what that is from but not the ZZ632. Just look at post #1 or below.

Stan

ZZ632/1000 DELUXE TECH SPECS

Part Number: 19432060
Engine Type: Chevy Tall-Deck Big-Block V-8
Displacement (cu. in.): 632 cu. in.
Bore x Stroke (in.): 4.600 x 4.750 in.
Block: Cast Iron Bowtie with 4-bolt main caps-tall deck
Crankshaft: Forged 4340 steel
Connecting Rods: Forged steel H-beam 6.660"
Pistons: Forged aluminum 2618 alloy
Intake Manifold: Aluminum high-rise single-plane
Throttle Body: 4500-style
Fuel Injectors: 86-lb/hr
Camshaft Type: Billet Steel Hydraulic Roller
Valve Lift (in.): 0.780 intake/0.782 exhaust
Camshaft Duration (@0.050 in.): 270º intake/287º exhaust
Cylinder Heads: Aluminum spread-port; 70cc chambers -RS-X design
Valve Size (in.): 2.450 intake/1.800 exhaust,Titanium (5/16-in stem OD)
Ignition Type: 58X crank-triggered, coil-near-plug
Compression Ratio: 12.0:1 (nominal)
Rocker Arms: Forged aluminum; roller-style
Rocker Arm Ratio: 1.8:1 (shaft-mount)
Water Pump: Aluminum
Oil Pan: Steel 8-quart
Recommended Fuel: Premium pump (93 octane or higher)
Maximum Recommended RPM: 7,000
Balanced: Internal

The engine in the link, not the OPs engine.

https://www.shafiroff.com/chevy-pump...isted-sr20.php