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Paul Ceasrine · 10-24-2011, 10:09 AM

Gene,

The main performance items in the 400/366 HP 'Ram Air II',,,

Cylinder Heads
* Casting #96
* Had larger intake ports, and re-designed round-shaped exhaust ports.
* Intake port volume (155 cc),,,,,,Exhaust port volume (162 cc)
* Combustion chambers 72 cc. ('spherized design' w/ shallow combustion chamber)
* Tulip-head shaped valves (2.11 intake / 1.77 exhaust) Extended length (5.20")
* Spiral-polished valves
* Dual high-rate valve springs
* Valve spring height (1.776")
* 11/32" Push-rod guide-plates
* 11/32" Push-rods (High-strength)
* 7/16" Rocker-arm studs
* 'D'-shaped port exhaust manifolds

* Note: The #96 casting heads are considered to have the best exhaust ports of the 400 heads.

Camshaft
* Code # "041"
* .491/.486 lift,,, 308*/320* duration,,, 115* Center-line,,, 87* Overlap

Note: The first computer-designed camshaft.

Carburetor
* Rochester #7028273
* 750 CFM
* Re-jetted, w/larger #42 Main Rod

Distributor
* Revised curve
* Hardened drive-gear

General Analysis:
The 366 HP 'Ram Air II' had a hell of a lot more than only 6 Horsepower more than
the '360 HP Ram Air I'.

10-24-2011, 10:09 AM	#34
Paul Ceasrine VIP Member Join Date: Apr 2009 Posts: 2,546 Likes: 0 Liked 10 Times in 10 Posts	Re: 1968 Pontiac GTO Gene, The main performance items in the 400/366 HP 'Ram Air II',,, Cylinder Heads * Casting #96 * Had larger intake ports, and re-designed round-shaped exhaust ports. * Intake port volume (155 cc),,,,,,Exhaust port volume (162 cc) * Combustion chambers 72 cc. ('spherized design' w/ shallow combustion chamber) * Tulip-head shaped valves (2.11 intake / 1.77 exhaust) Extended length (5.20") * Spiral-polished valves * Dual high-rate valve springs * Valve spring height (1.776") * 11/32" Push-rod guide-plates * 11/32" Push-rods (High-strength) * 7/16" Rocker-arm studs * 'D'-shaped port exhaust manifolds * Note: The #96 casting heads are considered to have the best exhaust ports of the 400 heads. Camshaft * Code # "041" * .491/.486 lift,,, 308/320 duration,,, 115* Center-line,,, 87* Overlap Note: The first computer-designed camshaft. Carburetor * Rochester #7028273 * 750 CFM * Re-jetted, w/larger #42 Main Rod Distributor * Revised curve * Hardened drive-gear General Analysis: The 366 HP 'Ram Air II' had a hell of a lot more than only 6 Horsepower more than the '360 HP Ram Air I'. Last edited by Paul Ceasrine; 10-24-2011 at 12:22 PM.