[DeTomaso] Rocker Arms
Brian Dudley
bd8134 at gmail.com
Tue Mar 10 09:11:54 EDT 2015
I am using 3/8" Comp Cams Hi-Tech pushrods with no interference using the
Yella Terra rockers.
YMMV.
On Tue, Mar 10, 2015 at 12:46 AM, doug351c <doug351c at gmail.com> wrote:
> 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?
>> _______________________________________________
>> Detomaso Forum Managed by POCA
>> Posted emails must not exceed 1.5 Megabytes
>> DeTomaso mailing list
>> [4]DeTomaso at poca.com
>> [5]http://poca.com/mailman/listinfo/detomaso_poca.com
>> To manage your subscription (change email address, unsubscribe, etc.)
>> use the links above.
>>
>> References
>>
>> 1. file://localhost/tmp/tmpfWSGk7.html
>> 2. file://localhost/tmp/tmpfWSGk7.html
>> 3. file://localhost/tmp/tmpfWSGk7.html
>> 4. file://localhost/tmp/tmpfWSGk7.html
>> 5. file://localhost/tmp/tmpfWSGk7.html
>>
>> _______________________________________________
>>
>> Detomaso Forum Managed by POCA
>> Posted emails must not exceed 1.5 Megabytes
>> DeTomaso mailing list
>> DeTomaso at poca.com
>> http://poca.com/mailman/listinfo/detomaso_poca.com
>>
>> To manage your subscription (change email address, unsubscribe, etc.) use
>> the links above.
>>
>>
>
-------------- next part --------------
I am using 3/8" Comp Cams Hi-Tech pushrods with no interference using
the Yella Terra rockers.
YMMV.
On Tue, Mar 10, 2015 at 12:46 AM, doug351c <[1]doug351c at gmail.com>
wrote:
Brian,
A
I had a wrong dimension for the pushrods in my first email.A I meant
to say that you have to be careful when you use 3/8" dia
pushrodsA which are larger than the stock 5/16" pushrods.A A
It's not the 7/16" studs that cause the rocker binding problem with
high lift cams.A Most every roller rocker has plenty of rocker stud
clearance for high lift cams.A A But not all of them are properly
clearanced for use with larger diameter pushrods when using high lift
cams.A The side of aA larger 3/8" diameter pushrod canA bind against
the backside of theA rocker body at near full lift.A A
A
Doug Braun
blue 73L #5505A A A
-----Original Message-----
From: Brian Dudley [mailto:[2]bd8134 at gmail.com]
Sent: Monday, March 09, 2015 12:28 PM
To: [3]doug351c at gmail.com
Cc: mark skwarek; Tony DiGiovanna; detomaso
Subject: Re: [DeTomaso] Rocker Arms
As per George Pence's sticky..
"If your motoras cylinder heads are milled and tapped for 7/16a 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 <[4]doug351c at gmail.com>
wrote:
A A i>>?
A A Yep Mark - that can't be empahsized too much.A That's why I
said the
A A backside may need to be clearanced. (it bit me too !!!)
A A Doug
A A -----Original Message-----
A A From: mark skwarek [mailto:[5]ehpantera at yahoo.com]
A A Sent: Sunday, March 08, 2015 6:34 PM
A A To: [6]doug351c at gmail.com; Tony DiGiovanna;
[7]detomaso at poca.com
A A Subject: Re: [DeTomaso] Rocker Arms
A A Just make sure that you have clearance between the pushrod and
the
A A rocker base at full lift. Under high lift the pushrod can make
contact
A A with the base of the rocker arm. Them the end of the rocker arm
end
A A will break off. Been there, done that.
A A Mark
A A On Sunday, March 8, 2015 9:48 PM, doug351c
<[8]doug351c at gmail.com> wrote:
A A I like the Scorpion Endurance SCP3023 1.73:1 forged aluminum
roller
A A rockers.
A A They have a hardened insert seat, the shaft is centerless
ground, a
A A 7/16"
A A poloc nut is included and they have a great lifetime
warranty.A $326 a
A A set
A A at Summit Racing.
A A Max spring dia = 1.625"
A A [1][9]http://www.summitracing.com/parts/scc-scp3023bl
A A I'm running these on my 70 Cleveland Mach1 engine.A Please
note though
A A that
A A if you intend to run 7/16" dia pushrods, their backsides need
to be
A A clearance for them.A Scorpion's Endurance series cost more
than the
A A Race
A A series but they have a narrower body and shorter polylocks so
they fit
A A better under stock rocker covers.
A A Doug Braun
A A blue 73L #550
A A -----Original Message-----
A A From: DeTomaso [mailto:[2][10]detomaso-bounces at poca.com]On
Behalf Of Tony
A A DiGiovanna
A A Sent: Sunday, March 08, 2015 4:00 PM
A A To: [3][11]detomaso at poca.com
A A Subject: [DeTomaso] Rocker Arms
A A 351C, solid flat tappet cam with lift of 0.640.A 7/16
screwed-in
A A studs.A Any
A A opinions on Rock Arms? PRW vs. Harland Sharp vs. other?
A A _______________________________________________
A A Detomaso Forum Managed by POCA
A A Posted emails must not exceed 1.5 Megabytes
A A DeTomaso mailing list
A A [4][12]DeTomaso at poca.com
A A [5][13]http://poca.com/mailman/listinfo/detomaso_poca.com
A A To manage your subscription (change email address, unsubscribe,
etc.)
A A use the links above.
References
A A 1. file://localhost/tmp/tmpfWSGk7.html
A A 2. file://localhost/tmp/tmpfWSGk7.html
A A 3. file://localhost/tmp/tmpfWSGk7.html
A A 4. file://localhost/tmp/tmpfWSGk7.html
A A 5. file://localhost/tmp/tmpfWSGk7.html
_______________________________________________
Detomaso Forum Managed by POCA
Posted emails must not exceed 1.5 Megabytes
DeTomaso mailing list
[14]DeTomaso at poca.com
[15]http://poca.com/mailman/listinfo/detomaso_poca.com
To manage your subscription (change email address, unsubscribe,
etc.) use the links above.
References
1. mailto:doug351c at gmail.com
2. mailto:bd8134 at gmail.com
3. mailto:doug351c at gmail.com
4. mailto:doug351c at gmail.com
5. mailto:ehpantera at yahoo.com
6. mailto:doug351c at gmail.com
7. mailto:detomaso at poca.com
8. mailto:doug351c at gmail.com
9. http://www.summitracing.com/parts/scc-scp3023bl
10. mailto:detomaso-bounces at poca.com
11. mailto:detomaso at poca.com
12. mailto:DeTomaso at poca.com
13. http://poca.com/mailman/listinfo/detomaso_poca.com
14. mailto:DeTomaso at poca.com
15. http://poca.com/mailman/listinfo/detomaso_poca.com
More information about the DeTomaso
mailing list