SBC Valve Guide Installation
John @ Costa Mesa R&D Automotive Machine describes how to replace valve
guides on the popular small block Chevrolet cylinder head.
Chevrolet Thermal Engine Cleaning Process
This video demonstrates the Sunnen Thermal Cleaning system that was used to
clean a small block (SBC) Chevrolet engine block by John Edwards @ Costa
Mesa R&D Automotive Machine (949) 631-6376. Your comments appreciated!
VW 5-Valve Cylinder Head Resurfacing
John Edwards @ Costa Mesa R&D Automotive Machine resurfaces a VW 1.8 turbo cylinder head on the Sunnen HBS-1300
and verifies surface finish with a profilometer. www.engine-machining.com
Cylinder Head 103 - Deck Tech
How to clean, inspect, and determine what you can do with your cylinder
head. Also how WHAT you do affects your oil system. There are many
variables at play when you make changes to your cylinder head deck from
your oil system, compression ratio, your valve timing and potentially even
disaster. 'best not to go that far with it. Watch this video and avoid it
if you're building your own 4g63 head.
The differences between this head and a 1g head are mostly related to port
sizes on the intake and Exhaust, and
different sized head bolt holes. The 7-bolt uses an 11mm bolt, and a
6-bolt uses 12mm. 1g heads have gigantic intake ports, but aside from
that, valve geometry, oil system functionality and the service limits are
all the same.
Also, click these links for in-depth discussions about oil port
modifications for all generations of Mitsubishis, and specifically for 2g
head installations on a 1g block.
4g63 Oil Port Modification:
2nd gen head on a 6-bolt block:
Possibly 2 of the best threads on 'Tuners for anyone considering a
1g-in-a-2g or for anyone that wants to know everything about a DSM oil
Boss 429 Cylinder Head Straightening
John Edwards discusses how he uses a thermal cleaning oven to straighten
excessively warped aluminum cylinder heads at his Costa Mesa R&D Automotive
Cylinder Head 105 - Valve Job Basics
Valves not sealing? Valves not bent? This is how you fix that problem.
In this video I outline the basic valve job procedure. Cleaning the
valves, cleaning the seats, cleaning the combustion chamber and lapping the
valves in to make a better seal.
Here I cover the process start-to-finish. It's the same exact process for
pretty much all non-rotary combustion engines. It takes patience and
perseverance to do this job, but anyone can do it. Reference your service
manual for measurements and service limits. Everything else that's not in
your service manual is in this video.
I apologize for not having broken busted crap to work with in this video.
It's more beneficial to all of you when bad fortune falls on me because it
gets well documented, and many people watching these videos are looking for
answers. If you have bent valves, you will discover it quickly once you
chuck one up in the drill. You'll see the face of the valve wobble around
while it spins. You'll see evidence of this damage on the valve seat. If
it's bad, you may see damage on the valve guides in the form of cracks or
missing pieces where the valve guides protrude through the head ports.
Give all that stuff a good visual inspection. ...and if you doubt yourself,
never hesitate to get a second opinion or consult a machine shop. They
will have access to expensive tools that you wont find in your average
Subaru Sleeve Installation
Another race prep modification that is performed by John @ Costa Mesa R&D
Automotive Machine is to install a set of ductile iron sleeves in the
Subaru engine. Check out how its done. www.engine-machining.com (949)
Cylinder Head 201 - Radius Cut Valve Job
This video covers the complete valve job process that your machinist might
perform. If the 100 series videos didn't help you identify and correct a
problem with your cylinder head, then this is the next step. This video is
brought to you with permission from my machinist in full 1080HD, and covers
cleaning up the head inside and out, preparation and setting up a radius
cutter, cutting all 16 valve seats, valve grinding, and spans 3.5 hours of
actual work in under 30 minutes. There's nothing like this anywhere else
THANK YOU BALLOS PRECISION MACHINE. Thank you for the professional
explanation and execution of a job excellently-done, and un-precedented
access to your facilities.
A valve job is done by re-grinding or replacing valves, and then having new
seats cut to match the faces of the valves you're using. There are several
different machines that might be utilized to achieve this result, but the
process is the same no matter how it's done. There are seat cutters that
utilize cutting stones. There are valve seat cutters with 3 separate
angles installed 120° out-of-phase, and there are single cutters with all
3 angles (radius cutter) that cut with one blade in one pass. The machine
demonstrated here is a Sunnen VGS-20 Radius Cutter. This machine (now out
of production) produces a gradual curved seat that's superior to the shape
of a traditional 3-angle seat. While a radius cutter does contain the 30,
45 and 60 degree angles, it does so without leaving any sharp edges between
My valve selection includes Supertech 1mm oversized nitride-coated
stainless steel undercut and back-cut intake valves, and 1mm oversized
Inconel back-cut Exhaust valves.
Inconel is a high-temperature alloy utilized in marine and forced-induction
performance engines that can handle more abuse than steel can without
melting. The other characteristics of the valves which are discussed
typically yield bigger gains in airflow than simply using a bigger hole and
a bigger valve.
Why I did this to a perfectly-good cylinder head:
I changed cams. Because the valves were previously recessed during another
valve job 9 years ago, my valve installed height was increased and this
raised the operating positions of my rocker arms. My new camshaft
selection dictates using the stock valve install height. The only
solutions to this valve install height problem are to either replace the
valve seats, or install oversized valves. I opted for the latter.