AFR Mongoose LS3 heads heads bring a lot to the party with their 12 degree, 6-bolt design. We buy these heads as porter castings and machine them to perfection on our CNCs. The shapes we impart to the ports and combustion chambers reflect our years of experience on our own engine builds.
We know what makes power and also survives the beating of competition. It's not chasing peak air flow at max lift by excessively cutting away the metal around the valve guides. Peak air flow occurs at only one instant in the cycle. Our focus is more on average air flow across the entire cycle. For spring packages with 0.650 inch max-lift, quoting a peak airflow at 0.800 inches is irrelevant.
Of paramount importance for us is that our heads don't break and wreck our engines. We therefore do not chase flow at the expense of weakening the heads mechanical integrity. That's a concern that non-engine builders don't share.
Our process for machining these heads includes CNC porting and combustion chamber machining on our 5-axis with CNC valve job and bowl bowl blend on our Newen CNC seat & guide machine (Click BUY NOW to see the videos on our website). We can optionally remove the 6-bolt provision for aesthetics when being used with a stock block.
The results we get are as shown in the Tables immediately below.
LIFT 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Intake 75 163 241 293 340 367 380 358 362
Exhaust 58 111 148 186 208 217 225 227 230
Key Dimensions
Intake Valve 2.165"
Exhaust Valve 1.600"
Combusion Chamber 67cc
Intake Port 260cc
Exhaust Port 95cc
We offer a variety of standard valve & spring packages for these heads to accomodate both naturally aspirated, boosted applications for use with both hydraulic and mechanical cams. Custom combinations are also available.
Standard Valve & Spring Packages
AFR solid stem valves with high RPM dual springs, titanium retainers, 0.650 inch max lift.
And yes, we eat our own cooking. This package is what we are using on our 720hp, 408ci LS and bring more power in the process as can be seen in the video.
Click BUY NOW to order or call us at 815-725-2727 if you have any questions or custom requirements.
