CPMotorworks Inc.

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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.

If you own one of my HF-2400/HF-2800 head fixtures, there's four tapped 7/16"-14 holes you may be wondering about. The...
10/15/2026

If you own one of my HF-2400/HF-2800 head fixtures, there's four tapped 7/16"-14 holes you may be wondering about.
The narrow pattern is 4.400" spacing for SBC/LS, and the wide pattern is 4.840" for BBC/BBF.
This makes for easy and stable setup for surfacing both intake/exhaust faces, or machining areas under the valve cover.
I just machined these rocker bosses to equal heights for the T&D shaft stands.

For Sale- Willys L-134 engine.$5500 invested, $4000 obo. Customer abandoned project. Message me or call if interested. ...
10/13/2026

For Sale- Willys L-134 engine.
$5500 invested, $4000 obo. Customer abandoned project. Message me or call if interested.

Machined, assembled, needs gaskets, oil pump & pan, timing chain & gears to complete.

Block bored, honed, decked, intake face surfaced, new valves guides installed and honed, seats ground, new valves, pistons, rings, bearings, Best Gasket rear seal, new head studs.

Crank seal surface welded, ground, Crank ground -.050"/.050".
Original cam reground and Parkerized, original lifters diamond lapped with correct radius.

FOR SALE-5.3L bored to a 5.7L is longblocked and ready for induction and ignition. Should be a great package in a stree...
10/08/2026

FOR SALE-
5.3L bored to a 5.7L is longblocked and ready for induction and ignition. Should be a great package in a street car!
Edit: Customer has decided to sell, $11k invested,
$10k buys it!
Lots of good parts in this build. 347ci, 11.4:1, should make around 485-490hp at the crank without much issue. Message me if interested.

Another HF-2400 headed to Iowa! Thanks for the order Matt!
09/30/2026

Another HF-2400 headed to Iowa! Thanks for the order Matt!

Indy heads needed a shave after some poor tuning under boost. Finished for MLS gaskets.
09/24/2026

Indy heads needed a shave after some poor tuning under boost.
Finished for MLS gaskets.

09/17/2026

Customer sent his new Olds heads in to be inspected..

Even the really expensive blocks need attention to detail. Rolled burrs on every main bulkhead, and a line hone far eno...
09/14/2026

Even the really expensive blocks need attention to detail.
Rolled burrs on every main bulkhead, and a line hone far enough out of spec it's getting reworked. Not how I want a Monday to go...

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.

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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