[Fot] Performance cam for a street TR4

[Bill Babcock]

TR3/4 motor flows like a pillow is stuffed over the intake. One change leads to another. With an intake manifold that looks like it was cast using plumbing parts and valves in the wrong places, there’s a limit to what a cam, bigger pistons, and a little more compression can do. Increasing compression is a great idea, but then the rods and crank start needing frequent attention. Next thing, you'll want to rev past 4500, you maniac. 


> On Mar 19, 2025, at 4:24 PM, chasgee22 at gmail.com wrote:
> 
> Thanks Bill.  I plan on using 87mm pistons already so maybe I’ll just shave the head a little to get more compression too.
> 
> Chuck
> 
>> On Mar 19, 2025, at 10:11 PM, Ponostyle <ponobill at gmail.com> wrote:
>> 
>> Hi Chuck,
>>  I'm sure you’ll get plenty of recommendations, but honestly, if all you’re going to do is a stock rebuild, then a different cam won’t do much other than screw with your powerband. If you’re not going to change anything else, the only worthwhile change is displacement, and even that is of limited benefit.    
>> Bill Babcock
>> Beach Bum
>> bill at ponostyle.com <mailto:bill at ponostyle.com>
>> https://www.Ponostyle.com
>> 
>>> On Mar 19, 2025, at 2:25 PM, Chuck Gee via Fot <fot at autox.team.net <mailto:fot at autox.team.net>> wrote:
>>> 
>>> So it looks like I have to rebuild the motor on my street TR4.  The current motor is stock and could use a little more performance.  Does anyone have a better than stock cam they are willing to part with?  Preferably something I can use with stock valve springs, but that’s not a deal breaker.  
>>> 
>>> If you don’t have a cam for sale, do you have a good recommendation?
>>> 
>>> Thanks,
>>> 
>>> Chuck
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>> 

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