[DeTomaso] Dyno Trip #1 and Roller Lifters.....

Daniel C Jones daniel.c.jones2 at gmail.com
Fri Oct 15 11:51:59 EDT 2010


Also, Steve what springs are you using (seat and open pressure)?

Thanks,
Dan Jones

On Thu, Oct 14, 2010 at 5:26 PM, Daniel C Jones
<daniel.c.jones2 at gmail.com> wrote:
>> we saw +300HP with some break up starting at 5700-5800 or so......
>
> Was that through the exhaust at the rear wheels?  Any head work
> or are they box stock?
>
>> 331 stroker bottom end.  Flat top pistons (two reliefs), Y303 Motorsport
>> aluminum heads,
>
> So around 10:1 compression ratio?
>
>> F303 cam, Ford roller lifters, 1.73 Ford full roller
>> rockers, RPM Edelbrock intake port matched to heads, and a
>> 570 Holley carb (street avenger?).
>
> Increasing to 700 CFM will pick up 10 HP.  What's the exhaust
> (header dimensions, mufflers).
>
>> Apparently the high volume pumps still cause some pressure increase at
>> speeds, with Ford lifters (and perhaps others!) and that you can then
>> lose performance due to the valves staying open....
>
> I'll pass this by a friend of mine who was in on the testing of
> Anderson Ford Motorsports Hi Rev hydraulic roller cams.  He started
> out with OEM lifters and then switched to the Crane link bars,
> ultimately turning 8800+ RPM with a hydraulic roller.  I know
> the Crane lifters specify a full turn past lash and that's what
> March ran.
>
> Dan Jones
>



More information about the DeTomaso mailing list