[DeTomaso] Rocker Arms
doug351c
doug351c at gmail.com
Tue Mar 10 00:46:43 EDT 2015
Brian,
I had a wrong dimension for the pushrods in my first email. I meant to say that you have to be careful when you use 3/8" dia pushrods which are larger than the stock 5/16" pushrods.
It's not the 7/16" studs that cause the rocker binding problem with high lift cams. Most every roller rocker has plenty of rocker stud clearance for high lift cams. But not all of them are properly clearanced for use with larger diameter pushrods when using high lift cams. The side of a larger 3/8" diameter pushrod can bind against the backside of the rocker body at near full lift.
Doug Braun
blue 73L #5505
-----Original Message-----
From: Brian Dudley [mailto:bd8134 at gmail.com]
Sent: Monday, March 09, 2015 12:28 PM
To: doug351c at gmail.com
Cc: mark skwarek; Tony DiGiovanna; detomaso
Subject: Re: [DeTomaso] Rocker Arms
As per George Pence's sticky..
"If your motor’s cylinder heads are milled and tapped for 7/16” stud & guide plate type rocker arms the Yella Terra YT-6321 rocker arm is the hot tip. This very rugged rocker arm also performs like a shaft mounted rocker arm therefore it requires no studs, guide plates or hardened push rods. Internet pricing for the Yella Terra YT-6321 rocker arm is in the range of $650 US dollars for a set of 16, sometimes even lower. That may look "pricey" up front when compared to the standard push-rod guided arm, but they don't require studs, guide plates, poly-locks or heat treated push-rods. Once you add up the price for a set of conventional roller rocker arms plus all the additional stuff you need the price difference is not that bad ... some guys feel it is break-even."
I am using these with a solid cam with the same lift.
Stock valve cover fits.
Using a rocker that you have to modify sounds like it is designed for a lower lift.
On Sun, Mar 8, 2015 at 10:49 PM, doug351c <doug351c at gmail.com> wrote:
i>>?
Yep Mark - that can't be empahsized too much. That's why I said the
backside may need to be clearanced. (it bit me too !!!)
Doug
-----Original Message-----
From: mark skwarek [mailto:ehpantera at yahoo.com]
Sent: Sunday, March 08, 2015 6:34 PM
To: doug351c at gmail.com; Tony DiGiovanna; detomaso at poca.com
Subject: Re: [DeTomaso] Rocker Arms
Just make sure that you have clearance between the pushrod and the
rocker base at full lift. Under high lift the pushrod can make contact
with the base of the rocker arm. Them the end of the rocker arm end
will break off. Been there, done that.
Mark
On Sunday, March 8, 2015 9:48 PM, doug351c <doug351c at gmail.com> wrote:
I like the Scorpion Endurance SCP3023 1.73:1 forged aluminum roller
rockers.
They have a hardened insert seat, the shaft is centerless ground, a
7/16"
poloc nut is included and they have a great lifetime warranty. $326 a
set
at Summit Racing.
Max spring dia = 1.625"
[1]http://www.summitracing.com/parts/scc-scp3023bl
I'm running these on my 70 Cleveland Mach1 engine. Please note though
that
if you intend to run 7/16" dia pushrods, their backsides need to be
clearance for them. Scorpion's Endurance series cost more than the
Race
series but they have a narrower body and shorter polylocks so they fit
better under stock rocker covers.
Doug Braun
blue 73L #550
-----Original Message-----
From: DeTomaso [mailto:[2]detomaso-bounces at poca.com]On Behalf Of Tony
DiGiovanna
Sent: Sunday, March 08, 2015 4:00 PM
To: [3]detomaso at poca.com
Subject: [DeTomaso] Rocker Arms
351C, solid flat tappet cam with lift of 0.640. 7/16 screwed-in
studs. Any
opinions on Rock Arms? PRW vs. Harland Sharp vs. other?
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-------------- next part --------------
i>>?
Brian,
I had a wrong dimension for the pushrods in my first email. I meant to
say that you have to be careful when you use 3/8" dia pushrods which
are larger than the stock 5/16" pushrods.
It's not the 7/16" studs that cause the rocker binding problem with
high lift cams. Most every roller rocker has plenty of rocker stud
clearance for high lift cams. But not all of them are properly
clearanced for use with larger diameter pushrods when using high lift
cams. The side of a larger 3/8" diameter pushrod can bind against the
backside of the rocker body at near full lift.
Doug Braun
blue 73L #5505
-----Original Message-----
From: Brian Dudley [mailto:bd8134 at gmail.com]
Sent: Monday, March 09, 2015 12:28 PM
To: doug351c at gmail.com
Cc: mark skwarek; Tony DiGiovanna; detomaso
Subject: Re: [DeTomaso] Rocker Arms
As per George Pence's sticky..
"If your motor's cylinder heads are milled and tapped for 7/16" stud &
guide plate type rocker arms the Yella Terra YT-6321 rocker arm is the
hot tip. This very rugged rocker arm also performs like a shaft mounted
rocker arm therefore it requires no studs, guide plates or hardened
push rods. Internet pricing for the Yella Terra YT-6321 rocker arm is
in the range of $650 US dollars for a set of 16, sometimes even lower.
That may look "pricey" up front when compared to the standard push-rod
guided arm, but they don't require studs, guide plates, poly-locks or
heat treated push-rods. Once you add up the price for a set of
conventional roller rocker arms plus all the additional stuff you need
the price difference is not that bad ... some guys feel it is
break-even."
I am using these with a solid cam with the same lift.
Stock valve cover fits.
Using a rocker that you have to modify sounds like it is designed for a
lower lift.
On Sun, Mar 8, 2015 at 10:49 PM, doug351c <[1]doug351c at gmail.com>
wrote:
i>>?
Yep Mark - that can't be empahsized too much. That's why I said
the
backside may need to be clearanced. (it bit me too !!!)
Doug
-----Original Message-----
From: mark skwarek [mailto:[2]ehpantera at yahoo.com]
Sent: Sunday, March 08, 2015 6:34 PM
To: [3]doug351c at gmail.com; Tony DiGiovanna; [4]detomaso at poca.com
Subject: Re: [DeTomaso] Rocker Arms
Just make sure that you have clearance between the pushrod and
the
rocker base at full lift. Under high lift the pushrod can make
contact
with the base of the rocker arm. Them the end of the rocker arm
end
will break off. Been there, done that.
Mark
On Sunday, March 8, 2015 9:48 PM, doug351c
<[5]doug351c at gmail.com> wrote:
I like the Scorpion Endurance SCP3023 1.73:1 forged aluminum
roller
rockers.
They have a hardened insert seat, the shaft is centerless ground,
a
7/16"
poloc nut is included and they have a great lifetime warranty.
$326 a
set
at Summit Racing.
Max spring dia = 1.625"
[1][6]http://www.summitracing.com/parts/scc-scp3023bl
I'm running these on my 70 Cleveland Mach1 engine. Please note
though
that
if you intend to run 7/16" dia pushrods, their backsides need to
be
clearance for them. Scorpion's Endurance series cost more than
the
Race
series but they have a narrower body and shorter polylocks so
they fit
better under stock rocker covers.
Doug Braun
blue 73L #550
-----Original Message-----
From: DeTomaso [mailto:[2][7]detomaso-bounces at poca.com]On Behalf
Of Tony
DiGiovanna
Sent: Sunday, March 08, 2015 4:00 PM
To: [3][8]detomaso at poca.com
Subject: [DeTomaso] Rocker Arms
351C, solid flat tappet cam with lift of 0.640. 7/16 screwed-in
studs. Any
opinions on Rock Arms? PRW vs. Harland Sharp vs. other?
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4. file://localhost/tmp/tmpfWSGk7.html
5. file://localhost/tmp/tmpfWSGk7.html
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5. mailto:doug351c at gmail.com
6. http://www.summitracing.com/parts/scc-scp3023bl
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