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Experiences with cleveland stroker kits
Hello everybody,

My name is Christian and I come from Austria. Some of us guys in Europe have been informed that there is a very interesting forum for 71-73 riders.
I think this is a very good idea to have special talk and support for our mustangs.

To my vehicle: it´s a 73 Mach 1 with a 351 cleveland engine 4V, some modifications have been done as fogged pistons, camshaft, 750 holy carburetor, wieand intake, headers.

But now I have some problems: During my yearly small overhaul I have detect that my camshaft is defect (one cam for cylinder 3). By planning this regarding to the costs and the effort of dismounting/ mounting the engine I think this would be a good chance now to stroke my 351 cleveland.

There are different stroker kits available 383 cui, 393cui and 408 cui. My favorite would be the 408 cui kit. But I am worried about the long term performance. Does anyone have bad experiences with the 408 kits ?

My plan would be to use most of my existing modifications as the 4V heads, the 750 Holly, intake aso.. with the 408 kit. Is this a good idea ?

Finally I would like to thank the team for becoming a member and would be happy for some feedback.

Best regards

best regards Christian

My Mustang is a "hybrid vehicle" it burns fuel and rubber Big Grin
I am in the process of building a 408 now. There are a few out there with no problems from what I understand.

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WELCOME aboard, Christian!

Regarding your question on the retention of your Intake, Carburetor and 4V Heads, I would suggest a couple of things.

First, I believe you need to decide exactly what you want as your primary goal for the car. Are you planning on racing it? Is it just for cruising? Do you want reliable daily transportation? You should be SINCERE in whatever decision you make, as you are probably going to spend REAL money, time and effort in this pursuit.

Once you have done this, contact a "trusted" Camshaft manufacturer and tell them EXACTLY what you want out of the motor, MOST OF THE TIME. The camshaft is often referred to as the BRAIN of the engine. It will dictate to a HUGE degree what other performance "changes" may be necessary for optimum results. Keep in mind that optimum results for a "race" motor is not necessarily optimum for a "street" motor. Certain cams will require different fuel requirements as will larger (stroked) motors. This could necessitate a larger carburetor and/or a different intake manifold.

Keep in mind that BIGGER is not always better!

Again Welcome to the Site.


Do the RIGHT thing.
Keep in mind that BIGGER is not always better!

Hmmm and yours is a 5what? Wink
(12-27-2010, 03:04 PM)Tnfastbk Wrote: Keep in mind that BIGGER is not always better!

Hmmm and yours is a 5what? Wink


Welcome to the forums, Christan! Glad to have you aboard! This is the only place on the internet dedicated to our cars that I know of! Enjoy! welcome

[Image: 1gq8uo.png]
1971 Mach 1 - 306cid/C4 Bright Yellow
"Just relax, I've got a friend named Felix who can fix anything!" ~James Bond
YES, you make an OUTSTANDING point on that one, Roy (TNFASTBK). I am reminded of an old saying,"do as I say, not as I doSmile.

Seriously though, I believe it should depend on one's intended usage. This is a grand opportunity for me to provide additional dialogue and clarification as I believe it bears emphasis. For example:

The 545 that is going into my '73 Mach I will be essentially a "race" motor with very little (if any) street time. It is being designed to safely turn 7500 RPM and to make maximum horse power. BIGGER in this case would have been a 598 or a 604 which would have necessitated a non-stock block. For my hobby racing purposes, BIGGER would not have been optimumSmile.

My '73 Grandé was built primarily for cruising, hence the more sedate 472 which was built for maximum torque (street domination?) at a much lower RPM. Again, since the motor does not have to live at 7500 RPM, there is no need for the bigger/stronger stroker crankshaft, fully ported aluminum heads, large modified carburetor or Mechanical Roller camshaft that I will be running in the 545.

So I must modify my original statement to say "BIGGER is not always better, BUT sometimes it is - - dependent upon intended usage."

Again, THANKS Roy for the opportunity to provide additional emphasisSmile.


Do the RIGHT thing.
dancebanana roflbananachiliblahwhistling
But I do agree with you.You should build a motor for what it will be used for.
If you research the Engine Masters Challenge you will find many 400 - 408" clevelands that have done very well. 4" bore and 4" stroke.

Jeff T.

Low buck, touring style, '73 Convertible "rolling restoration", 351c, 2v heads with a shave and a haircut, Performer intake, Holley 650(ish), roller rockers, screw in studs, guideplates, stainless valves, Duraspark / Motorsports MSD, T-5 conversion. 1-1/8" front, 3/4" rear swaybars KYB shocks and some home brewed subframe connectors. Future plans; JGC steering box, Cobra brakes and... paint, interior, etc.

When I die I want to die like grandpa, peacefully in my sleep... not screaming, like his passenger.

[Image: 1_12_09_14_10_15_11.png]
I've heard it cautioned in other forums that 351s have a tendency to have thin walls between cylinders, so a careful examination of the block would definitely come into play when determining how much to bore. Some great information is available at


Welcome to our club, and please don't hesitate to stop by with your questions.



[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided

Thanks for your feedback.
In principle I would like to have a combination of daily driver and 1/8 mile race. The max. speed is not so important but torque at low rpm and good acceleration would make me happy. There is also no need for a good idle.

I have found a forged stroker kit from Speedomotive including

The camshaft would be from Comp Cams Type “Xtreme Energy, XE256H”.

Would you propose also other modifications or does anybody have information’s about the performance (horse powers, torque) for a 408 or 393 Stroker ?

best regards Christian

My Mustang is a "hybrid vehicle" it burns fuel and rubber Big Grin
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