HEY RACERS!  Would YOU like to be one of our monthly featured boat or race car drivers?

It s SO easy, just send us a review of our header spacers (quality, effectiveness and customer service),
send us pictures of yourself, car and a small introduction to Jennifer@Nicholas-machine.com and you
will be entered into a draw for the feature! Don't worry you stay in the draw until you win.

Can't wait to meet you!

CALL 574-654-7523 FAX 574-654-8780 EMAIL racing@nimac.biz
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Welcome To Nimac Racing

Visit Nicholas Machine Nimac Racing is a division of Nicholas Machine, LLC. Since 1983 Nicholas Machine, LLC has become the Midwest's go-to machine shop for the really "tough jobs." The company specializes in building molds and tooling for the investment casting, plastic injection and ceramic injection industries.

Nimac Racing designs and builds high-performance race car parts, including header adapters and spacers, for a variety of Stahl, Brodix, Reher-Morrison and SBC headers for Small and Large Block Chevy engines, as well as air cleaner adapters, duct supports, race car vents.


Visit Us

Map Us Are you interested in seeing our quality products being manufactured and processed. Our goal is to provide you with personalized services. Why not make arrangements for a visit to our facility located at 117 N Filbert Street in New Carlisle, Indiana.

Call 574-654-7523 or email Jennifer to request an appointment so that we may plan your personal tour. Click on plaque for directions.



Header Adapters and Spacers

Click To Enlarge HS-1 Spacers
Attaches Stahl and Brodix bolt pattern exhaust to Small Block Chevy heads. Center ports of the Stahl and Brodix pattern have a 4.9" dimension between the two 3/8" bolt holes. The D-shaped ports are 1.3" x 1.3". Our spacers are made from 6061-T6 aluminum, 1/2" thick. Kit includes 12 short head screws to attach spacers to your heads.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-2 Spacers
Attaches SBC bolt pattern exhaust to heads with Stahl or Brodix bolt pattern. Center ports of the Stahl, Brodix pattern have a 4.9” dimension between the two 3/8 diameter holes. D shaped ports are 1.3” x 1.3”. Made from 6061T6 aluminum, ½” thick. Includes 14 bolts to attach to heads
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-3 Spacers
Attaches Stahl or Brodix bolt pattern exhaust to Small Block Chevy heads. Center ports of the Stahl/Brodix pattern have a 4.9" dimension between the two 3/8" diameter bolt holes. Larger D- shaped ports are 1.5" wide x 1.65" tall to minimizing porting time when fitting to large port heads. Made from 6061-T6 aluminum, 1/2" thick. Includes 12 bolts to attach to your heads.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-4.5 Spacers
Spacer for Small Block Chevy heads to SBC exhaust. D shaped ports are 1.3” x 1.3”. Made from 6061T6 aluminum ½” thick.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-4.75 Spacers
Spacer for Small Block Chevy heads to SBC exhaust. D shaped ports are 1.3” x 1.3”. Made from 6061T6 aluminum ¾” thick.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-5.75 S Spacers
Spacers for Big Block Chevy heads to Big Block Chevy exhaust with square ports.
Square ports have 1.85" x 1.85" bore.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-5.75 R Spacers
Spacers for Big Block Chevy heads to Big Block Chevy exhaust with round ports.
Round ports have 1.837" bore.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-6.5 Spacers
Spacer for SB2 heads to SB2 exhaust. Round ports are 1.9” diameter. Made from 6061T6 aluminum ½” thick.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-6.75 Spacers
Spacer for SB2 heads to SB2 exhaust. Round ports are 1.9” diameter. Made from 6061T6 aluminum ¾” thick.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-8.5 Spacers
Spacer for Small Block Chevy heads to SBC exhaust. Square ports are 1.45” wide x 1.5” tall for Vortec heads. Made from 6061T6 aluminum ¾” thick
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-8.75 Spacers
Spacer for Small Block Chevy heads to SBC exhaust. Square ports are 1.45” wide x 1.5” tall for Vortec heads. Made from 6061T6 aluminum ¾” thick
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-9 AL Spacers
One piece spacer for Small Block Chevy heads to SBC exhaust. Square ports are 1.45 wide x 1.5 tall. Especially useful for installing in tight spaces like boat engine compartments. Inner bolts on end ports are counter bored to bolt to heads if using marine exhaust manifolds. Allows removal of manifold without removing spacer. Made from 6061 aluminum ¾" thick. Includes 4 bolts to attach to heads through counter bored holes.
$120 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-10 Spacers
One piece spacers for Big Block Chevrolet motors. Square ports are 1.85" wide x 1.8" tall. Especially useful for installing in tight places like boat engine compartments. Inner bolts on end ports are counter bored to bolt to heads if using marine exhaust manifolds. Allows removal of manifold without removing spacer. Made from 6061-T6 aluminum 3/4" thick and includes 4 bolts to attach to your heads.
$120 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-11 Spacers
Spacer adapter bolts to a Brodix, Stahl bolt pattern head to a Brodix, Stahl pattern exhaust. Center ports of Stahl, Brodix pattern have a 4.9” dimension between the two 3/8 diameter bolts. One side fits a 1.8 diameter Brodix port (Felpro gasket # 1409) to a D shaped Stahl port (Felpro gasket # 1407). Ports blend smoothly from one shape to the other requiring minimal hand porting. Made from 6061T6 aluminum ¾” thick.
$105 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-12 Spacers
Attaches Hooker bolt pattern exhaust to SBC heads. Center ports of the Hooker pattern have a 4.25” dimension between the lower two 5/16 diameter bolt holes. Square ports are 1.45 wide x 1.5 tall. Made from 6061T6 aluminum, ½” thick. Includes 12 bolts to attach to heads.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-14 Spacers
Attaches Rehr-Morrison bolt pattern exhaust to SBC heads. Center ports of Rehr-Morrison pattern have a 4 17/32” center to center dimension between the top two 3/8 diameter bolts. Rectangular ports are 1.45 wide x 1.55 tall. Made from 6061T6 aluminum, ½” thick. Includes 12 bolts to attach to heads.Clearance cut on top to reduce valve cover interferances.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-15 Spacers
Attaches Reher-Morrison bolt pattern exhaust to 18 degree bolt pattern heads. Center ports of Reher-Morrison pattern have a 4 17/32" center to center dimension between the top two 3/8" diameter bolts. Eighteen degree heads have a spacing of 4 5/8" between the two holes on either side of the center ports. Our rectangular ports are 1.6 wide x 1.7 tall. Made from 6061 T6 aluminum. ½" thick. Includes 12 bolts to attach adapters to heads. Clearance cut on top to reduce valve cover interference.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-16 Spacers
Attaches 18 degree exhaust to Brodix / Stahl bolt pattern heads.18 degree heads have a spacing of 4 5/8” between the two 3/8 bolt holes on either side of the center ports. Brodix / Stahl pattern have a 4.9” spacing between the bottom two 3/8” bolt holes below center ports. Our rectangular ports are 1.6” wide x 1.7” tall. Made from 6061 T6 aluminum, ½” thick. Includes 12 bolts to attach adapters to heads.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-17.5 Spacers
Spacer for Stahl or Brodix bolt pattern exhaust to Stahl/Brodix pattern heads. Center ports of Stahl, Brodix pattern have a 4.9” dimension between the two 3/8 diameter bolts. D shaped ports are 1.5” wide x 1.65” tall. Made from 6061T6 aluminum 1/2” thick.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details


Click To Enlarge HS-17.75 Spacers
Spacer for Stahl or Brodix bolt pattern exhaust to Stahl/Brodix pattern heads. Center ports of Stahl, Brodix pattern have a 4.9” dimension between the two 3/8 diameter bolts. D shaped ports are 1.5” wide x 1.65” tall. Made from 6061T6 aluminum 3/4” thick.
$90 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details



Oxygen Sensor

Click To Enlarge HS13 Oxygen Sensor fitting boss to be welded into exhaust pipe. MM 18 x 1.5 threads fit the most popular sensors. Made from mild steel for ease of welding.
$17 for 1     $25 for 2     $33 for 3
USD FREE Expedited Shipping (USPS Priority Mail®)
    Shipping Details

Choose Option




Air Cleaner Adapter

Click To Enlarge NM04 Air Cleaner to use a standard 5 1/8" diameter air cleaner housing on a 4 7/32" neck carberetor. This part is machined from billet 6061 aluminum, and will not deform like the plastic ones, plus it looks a lot better. Similar to the plastic part made by Mr Gasket #KAI 2082.
$35 USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details



Duct Support

Click To Enlarge AR3 Duct Support and coupling bracket. Has angle shaped attaching point molded to a three inch diameter tube. Attaches to square or round frame members easily with zip ties, hose clamps or drilled and screwed. Made from a super tough nylon material that is nearly indestructable. Allows use of shorter pieces of expensive high heat restisant flex ducting near brakes and lower heat ducting going to the front inlet ducts. Sold in Pairs..
$20/pr USD FREE Expedited Shipping (USPS Priority Mail®)     Shipping Details



Race Car Vents

Front Air Vents
5-1/2" x 7-1/2"
3" Outlet
Sold in Pairs
$33/pr. FREE Expedited Shipping (USPS Priority Mail®) Shipping Details
Choose Color

Click To Enlarge
NACA Style Side Vent
5-1/4" x 11"
3" Outlet
Sold in Pairs
$40/pr. FREE Expedited Shipping (USPS Priority Mail®)
Shipping Details
Choose Color

Click To Enlarge



CALL 574-654-7523 FAX 574-654-8780 EMAIL racing@nimac.biz Click Click Click

Dealer Inquiries Welcome
We are always looking for new dealers and businesses to sell our quality products.
Discount pricing on orders of 11 or more items. Contact us for details.


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