Items For Sale

                Item prices are plus actual freight. 

            All items are subject to quantities at hand..

Break in oil - 30wt. Brad Penn $4.50/qt. 

V6/V12 1/4" thick laser cut exhaust flanges for making your own custom exhaust . Available for stock heads and Magnum heads.  $60 / v6 pair,  $100 / v12 set.

V12 piston rings - Brand New Moly (Cast iron ring which uses a Molybdenum alloy as a face material) Std, 20, 30, 40, 60 sizes in stock $450 per V12 set. $250 per v6 set. These are file-fit rings. Proper gap is responsibility of engine builder. 

Custom Pistons - Lightened for higher RPM. Plated. Any ratio. With rings and pins. $3,600 per V12 set. 8 week delay.

N.O.S. rings (New Old Stock) by Continental, Sealed Power, Muskegon.... $100/V6 set. Have some Std, .020, .040, .060.  These rings are probably between 20 and 40 years old. Still in the factory cartons.

Used pistons - $50/ea. We don't use the stock style dish pistons in our engine. Around 15% of the takeouts are very lightly used and are available.Let us know the target skirt dimension, dish depth and the target weight and we will see what we have. Typical skirt wear is .003 total so don't finish boring until pistons have arrived for final fitting. .003-.004 total clearance is target. Knurling skirts up to .004" available for $10/piston. Note - as of Jan 2012 most of the nice pistons are gone.  Supply is very limited.

V12 transmission adapter. These four pieces bolt to the V12 and allow for a Chevy Muncie style manuals and Chevy automatic transmissions to bolt up. They also allow the starter to be changed out for a modern Chevrolet permanent magnet gear reduction starter. We have used the Tilton Severe Duty Super Starter and the Powermaster Ultra Torque with excellent results. Starter not included. We have bolted several of the Tremec TKO 5 speed overdive manual transmissions, 4l80 4 speed autos and 6L90 6 speed auto's to these V12's with these addapters. $1,350.

Brand new 6L90E transmissions. Limitied supply. This is the heavy duty 1 ton and 3/4 ton 6 speed automatics. These are straight from a GM assembly plant and were destined for 2010 Chevy 3/4 ton vans. One shot deal. When gone...their gone. With converter $2,800 ea.

V12 Distributorless ignition systems. These include (2) brackets for attaching the coil packs between the carbs, a custom aluminum bracket to hold the pickup sensor, a dampener that has been turned to accept the custom trigger wheel, custom plug wires, MAP sensor to replicate vacuum advance for cleaner plugs and better mileage and finally a dial adjustable timing computer. No laptop required.  $1,350 plus your dampener core. Add $100 for no core. Deduct $25 if you wish to cut your own dampener.

DIS Plug wire set assembled. Taylor 8mm wire with MSD and Taylor boots and terminals $80.

Plug wire set for stock distributor $100. Uses twice the footage of wire compared to the DIS setup.

V12 external oil system.  Stem includes a giant Peterson DF wet sump external pump, (2) pulleys, belt, bracket to hold pump to block,  custom drive mandrel, custom filter "oil-in" setup, dash 12 braided hose and fittings, dash 16 braded hose and fittings, distributor plug  and  modified oil pan. $1,800 plus your old oil pan. Add $200 for no pan core. Save $100 by modifying your own pan.

A few V6 distributors in their boxes labeled rebuilt in 1992. No gears caps  or rotors. They do have points and both advances. These came in a lot purchase. $35 ea.

N.O.S. 478 v6 factory rod bolt in original Gm packaging $5. No nut.

Limited availabilty.

Used 702 rod bolts with nut $1.

V12 Rod bolt set - ARP 2000 series (24) bolts, (24) nuts $340.

Reground cam - "HOTROD Cam". Around .480" valve lift and 230-238 degrees @ .050" lift.

                  $400 + good core.

                  $600 with bad but rebuildable core..

                  $1,100 with no core.

                  Knock off $50 if bought with lifters and bearings.

V12 cam bearing set -std size. (7) pieces. $130.

Reground and rebuilt hydraulic lifters. V12 (24) piece set $240 with exchange. $350 outright. 

Stock Barry Grant 500cfm down leg booster 2bbl carb. $350 ea.

Annular booster 2bbl carb tuned for Hotrod cam. These are custom made by Barry Grant just for us. $375 ea.

2bbl carb adapter $20. This bolts a holley 2bbl type carb to the v12 manifold. Will not work on magnum intakes.

Brass freeze plugs Block set 10 pcs $30

                                   Head set 8 pcs $21

Alternator Brackt $30. Unpainted bracket, bolts and shims. This places a chevy -10 or -12 alternator above the fuel pump. Use stock v12 "s" type adjusting bracket with spacer attached at lower hose boss. Used adjusting arm with spacer and bolts $30. Adjusting arm requires drilling of hose boss.

Brass plug dipstick $15. Gets rid of the stock monstrosity. Looks like a brass plug when installed but has a stubby brass dipstick.

Radiator 20" cooling fan $90. Heavy duty steel fan that fits the V12 water pump. Other sizes available with 2 week delay.

Drain Plug for oil pan -new $5

Stock V12 Crankcase air filters- $15.  

Block Breather low profile $15. Gets rid of the industrial steel unit behind the head and replaces it with an 1-1/4" plastic vented "oil" push-in plug and a rubber grommet.

PCV Valves. $4ea. These screw into the heads, under the valve cover and into the siamesed intake tract. Most heads are drilled and tapped here. But not all. 1 per head.

Stock V12 oil filters - $20.

Spark Plugs $2ea. Not for LP or Natural.

Well used natural gas carbs that came on the 702 v-12's. Some were setup as (2) carbs per V12 and some were (1) carb per V12. Your pick. $35 as-is.

Factory service manuals covering the GMC V-12's and some V-6's. Used but good shape. $50

Used PTO clutches. These are lever action clutches that were used to engage V12 power to a stationary load. $400. Well used. As is.

V12 SAE #2 bellhousings. Well used and dirty. $100.

V12 Distributors - as is $100. Typically they have the vacuum advance plate permanently locked out. 

 V12 Distributor gears - New. These are the small gears that go on the sub-shafts that are installed into the main housing. $50/pair.

V12 starters. $100 used 1965 starters as-is plus freight. We will hit it with 12v to make sure it spins and sounds OK.

V12 Flywheels. $100 as-is. 

V12 aluminum crossover manifold. These connected the two v12 intake manifolds and allowed a single carb. Well used. $25.

V12 Exhaust manifolds. $50 ea.

V12 Intake Manifolds. If you have been wanting to modify your old manifold for more power but were afraid you might ruin the original, then order some spares from ThunderV12. $50 ea.

V12 Crankshafts. Checked for cracks, straightness and micro polished. $2,950ea. Balanced $3,250 ea.

V12 Factory Rods. Resized. No bolts. $50 ea.

V12 oil pans - as is. $200 ea.

V12 Cylinder Heads - Cleaned, surface cut and pressure checked. Stock valves and springs. No rockers. $500ea.

V12 Cylinder Head Porting service. Bump intake flow up 30% and exhaust 15% -  $2,400.

V12 Valves. New Intake $30 ea.$300/ v12 set. New sodium filled Exhaust valves are in stock again at $40 ea. $400/v12 set. Recut good used Intake $15, recut exhaust $20.

Exhaust valve kit $30. Kit replaces the 7/16" sodium valve with a standard 3/8" stem valve. Kit includes a 3/8" valve guide, a 3/8" valve, a new retainer and keeper.Qty (12) $330.

Valve springs. new $6 ea. Tested used spring $1.50 ea.

Hi Lift Valve Spring Kit. $388 for v12. This kit replaces the springs, retainers, locks, and seals allowing for .550"+ valve lift. Requires machining boss for stem seals. V6 kit $200.

Valve Guides. Exh $3.50, Int $2.50 ea. 3/8" exhaust guide $7ea.

Exhaust Valve Seat $6.

Valve Stem Seals $2ea intake, Exhaust $3 ea. Require machining.

 Call for details.