Head Bolt Set

New head bolts are recommended when removed from the engine due to their Torque to Yield design.  Please tell us what vehicle you are using these for, or the donor vehicle if you are swapping an engine.  This listing is used for all variations of the GM 60V6 and because there are multiple part num…

Ported 3400 V6 Manifold Set

We offer 2 stages of porting, each with its own level of modification.  All of our manifolds are cleaned, baked, blasted, and inspected for cracks and warpage.  Stage 1 uses the stock large port 3100/3400 intake gaskets as a template.  Stage 2 uses the larger 3500 upper intake gasket for the most…

2000+ 3100 / 3400 Intake Gasket Set

Full intake gasket set with upper/lower, EGR, Throttle Body, Injector O rings, valve cover gaskets, valve cover bolt seals, lower intake manifold bolts, etc.  

3100/3400 Upper Intake Gaskets

Large Port upper gaskets with Throttle Body and EGR gasket

Oil Bypass Valve

GM Oil Bypass Valve is a simple piece to remove and replace when you have a block cleaned for a rebuild.  

EGR Block Off Plate

1/8" Aluminum plate to block off the EGR port on the intake manifold.  For off road use only.  M22x1.75 plug for the exhaust manifold is not available at this time.  

Custom Tuning (OBD2)

This listing is for tuning only.  If you are looking for a programmed computer, please use the Performance Computer listing.  Tuning is available for 3100 and 3400 engines only!  HPTuners has removed the newer engines from our license and we are unable to offer any tuning services for those ap…

HPTuners MPVI 2

The newest version of HPTuners hardware was recently released, with improved features and updated software.  These units do not include credits, which are required to tune a car.  You can scan without credits, so we offer these bare, and with 2 credits at a discounted rate.  Additional credits ca…

Stage 0 3400 V6 Cylinder Heads

If we were to offer a stock replacement set of heads, this would be it.  Level 0.  It is what you should expect from a performance based company, with detail to work still measured for consistency.  Our machined deck surface will give the best head gasket seal, and our valve job is based on longe…

Stage 1 3400 V6 Cylinder Heads

Stage 1 is Stage 0 with better hardware and machine work.  That part shouldn't be surprising, so lets keep it simple.  We replaced the valves with a newer, lighter version of the same stock diameter.  It helps that they also flow a little better.  To take advantage of this, we also do a 5 angle …

Stage 2 3400 V6 Cylinder Heads

Stage 2 is what we base our naturally aspirated racing heads on.  Bronze liners give us a better than stock valve guide for performance applications, and the stainless valves greatly improve the flow potential.   A cleaned, baked, blasted, and pressure tested set of heads Machined deck su…

Stage 3 3400 V6 Cylinder Heads

Designed for boost applications only.  Larger exhaust valve requires new seats to be installed, but also gives us a better starting point for the valve job and bowl area.  Bronze liners give us a better than stock valve guide and allows for a tighter stem to guide clearance.  This will help keep …