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

steven.liebenow at att.net steven.liebenow at att.net
Fri Oct 15 18:10:52 EDT 2010


Dan & all...  answers!

Test was done thru the Mangusta International ANSA copy mufflers.  Basically 
stock setup....

Headers are Hall version #1 I believe....a tad bigger than stock. Good bends 
etc.

Heads are box stock from Ford Motorsports. (I did add adjustable studs...)  
These are the Y303 heads...which offer a little more
meat around the intakes.
Ford hotline dude said that they had experienced some gasket issues with X & 
Z303 heads...SO, not for me!  These were plenty
for what I was doing in the Goose....much above 6000 and it's sorta like 
having..OK, never mind....  Anyway, you'd be going really 

fast in a car not built to go but sorta fast!  Plus I don't trust the jackshaft 
pulleys to stay together!!!  Just me...  


Springs should be sufficient to 6000-6500 I believe.  Again, out of the box.   I 
did vary and use the 1.73 rockers.

I think the X and Z exhaust ports got bigger too, which would have been an issue 
trying to get headers to fit.....so the Y303 was
a better choice I believe.

CR is around 9.8-10 if I did my math properly.... 

Steve



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.



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