CPMotorworks Inc.

CPMotorworks Inc. Performance Engine Machining and Assembly,
Custom Cylinder Head Fixture Manufacturing CPM is owned and operated by Pete Graves.

Our goal is to provide first class machine work and engines that perform at their potential. We want to provide you with service and results that makes you, the customer, feel good about your investment with us.

Trying to finish up a few projects that have been waiting since my extended stay in the SICU, this Willys 134ci L head i...
09/03/2026

Trying to finish up a few projects that have been waiting since my extended stay in the SICU, this Willys 134ci L head is looking a slight better than when it came in covered in some sort of sticky spray.
Cleaned, bored, honed, new guides, valve job, new valves, pistons, rings, bearings, crank ground, camshaft & lifters reground, ready for head and sheet metal to be installed.
On to the next project waiting finishing details.

New product alert! AMC guys, steel caps are now available! A rear cap will also be available soon. I've worked with Peyt...
08/27/2026

New product alert! AMC guys, steel caps are now available! A rear cap will also be available soon.

I've worked with Peyton at Performance Driven Design to take on the task of making a hard to get product available for the AMC crowd, and he has knocked out a really nice product!

These samples will be at the AMC show at Great Lakes Dragway this weekend 8/28/26 for visual inspection, and a retail price will be available shortly!

08/15/2026

555ci a few weeks ago, 825hp @ 6500 on this pull. Made 830.7hp on the next pull with 2" headers.
Pro Systems 1100 Dominator, Victor intake, Brodix RR294 heads by CFM Performance, CPM custom solid roller, 10.6:1 on 91 octane.

08/15/2026

555c Pump gas BBC 2026

Another engine ready for customer pickup, VW 1.8T E85 build. This customer has been really patient, as this is not some...
08/12/2026

Another engine ready for customer pickup, VW 1.8T E85 build. This customer has been really patient, as this is not something I typically would do, but he couldn't find anyone local at the time to do it for him.
Slowly trying to finish up several projects that have been waiting way too long to get wrapped up.

Something a little different, a late 50's GMC I-6 head for a 270ci. Cleaned, mag, shot blasted, new guides, valves from...
08/11/2026

Something a little different, a late 50's GMC I-6 head for a 270ci.
Cleaned, mag, shot blasted, new guides, valves from another application, hardened seats, springs, locks, ready for life in a military vehicle.

CPM built 555ci 7-'26. Best pull made 830.7hp @ 6500 748lbs @ 5000 with 2" x 3.5" header.2.25" x 4" header (too big) mad...
08/09/2026

CPM built 555ci 7-'26.
Best pull made 830.7hp @ 6500 748lbs @ 5000 with 2" x 3.5" header.
2.25" x 4" header (too big) made 843.6HP @ 6500, 743lbs @ 5600.
Both on 91 octane.

Pump gas 555ci on the dyno today. 10.6:1, Kwik Trip 91 octane, solid roller, 843hp @ 6500, 745lbs. Should be entertai...
07/25/2026

Pump gas 555ci on the dyno today. 10.6:1, Kwik Trip 91 octane, solid roller, 843hp @ 6500, 745lbs.
Should be entertaining with a 6 speed...

Dart based BBC for a customer from Indianapolis with a 6 speed 1971 Chevelle. Should be a healthy pump gas combo that ge...
07/23/2026

Dart based BBC for a customer from Indianapolis with a 6 speed 1971 Chevelle. Should be a healthy pump gas combo that gets driven.

JUST FYI- I'll be closed the rest of this week 7-7-'26 as my youngest had surgery today and I'll be at the hospital with...
07/07/2026

JUST FYI- I'll be closed the rest of this week 7-7-'26 as my youngest had surgery today and I'll be at the hospital with him overnight and caretaker for at least the rest of the week. Hopefully by next week he is feeling well enough I can get back in the shop.

Address

4611 N Katherine Drive
Janesville, WI
53548

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 4pm

Telephone

(608) 290-4456

Website

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