[Murf]

Good morning all!
I’ve tried to find the info searching but came up empty.

Came you guys tell me what length rocker stud I’d need for the Speedmaster heads? I’ll be using the Ferrea valves with the RAIV length stems. Shooting for 1.8 valve spring installed height & will be using Crower 1.7 aluminum roller rockers.

How do you figure out the height? Trial & error or is there a way to calculate it?

Now for the bonus questions. 😁

At what point does it help to go to a 2.19 intake valve?

Thanks & Merry Christmas!
Murf

[steve25]

Will you be using a stud girdle?
Unless your looking to make over 650 hp and very well port the heads, then there’s no need for a 2.19” intake valve.

[Jim Moshier]

Murf,

I talked to Butlers about the Speed Master heads that they are now carrying and they use the ARP 100-7101 Pontiac Rocker studs 7/16 X 7/16 1.900.

Jim

[Murf]

Thanks Jim!

Hi Steve, Not using a stud girdle. Jim has answered the stud question.
As far as the 600 HP IDK. My tentative plan is a 474 or maybe 488 with these heads. 236/242 on 112 with right a .600 lift. For intakes I have an RPM, Torker 2 and a Knockoff big single plane that looks kinda like a Tomahawk. 1 7/8 headers. Is that enough motor to benefit from the 2.19 intake? I have to buy valves anyway, so I thought I’d ask about the 2.19.

Thanks for your thoughts!
Murf

[i82much]

I used ARP-334-7203, Rocker Arm Studs, Pro Series, 7/16-20 in. Thread, 2.10 in. Effective Stud Length, Kit, on my edelbrock round ports.

[steve25]

With what it seems those heads flow out of the box and in regards to running that Cam that you are using with its .600" lift and the option for a better Manifold then the Torquer II ( restriction ) your motor should make 575 hp.

In regards to the bigger valve and for safety sake ( so the seat is not too thin and drops out) I would first want to know the the Intake seat OD in those heads is at least 2.240"

[Murf]

Originally Posted by Jim Moshier

Murf,

I talked to Butlers about the Speed Master heads that they are now carrying and they use the ARP 100-7101 Pontiac Rocker studs 7/16 X 7/16 1.900.

Jim

Jim, are you using those studs? I noticed they say they don’t have the shank for the guide plates. Just wondering if they really work.

[Murf]

Originally Posted by i82much

I used ARP-334-7203, Rocker Arm Studs, Pro Series, 7/16-20 in. Thread, 2.10 in. Effective Stud Length, Kit, on my edelbrock round ports.

Thanks for the part number!

Murf

[i82much]

Originally Posted by Murf

Thanks for the part number!

Murf

No problem. I spent hours searching my email account looking for my old summit order. I had to sort through thousands of emails from various women calling me "stud." But then it finally hit me, no one has ever called me "ARP" so that made it easy to find

[Skip Fix]

ARP 7203 or 7103 seems to click in my mind also.

[Jim Moshier]

Murf,

Not sure as they will be delivered today Tuesday. I will let you know when I get them! Butlers just said that this is what they were using I had originally ordered another number they were out of stock at the time and Chuck Smith from Butlers said they were using these? again I will let you know!
Jim

[Jim Moshier]

Murf, this is what they look like!

Jim

[Murf]

[QUOTE=Jim Moshier;6304484]Murf, this is what they look like!

Jim[/QUOTE

Thanks Jim! I have have misspoke on the guide plate deal. Summit listed them as No for guide plates but others list it for use with guide plates.

Thanks again Jim & Merry Christmas to all!
Murf

[Murf]

Originally Posted by steve25

With what it seems those heads flow out of the box and in regards to running that Cam that you are using with its .600" lift and the option for a better Manifold then the Torquer II ( restriction ) your motor should make 575 hp.

In regards to the bigger valve and for safety sake ( so the seat is not too thin and drops out) I would first want to know the the Intake seat OD in those heads is at least 2.240"

Thanks Steve! Assuming for now that the seats are OK for the larger valves, would there be any down side using the 2.19 valve with that cam & 470-490 cubic inches?

Thanks again
Murf

[steve25]

The only potential down side is waste of money for no added, or very little power gain if that bigger valve is just shrouded by the chamber, which a flow test would need to be done to determine.

If the stock chamber is not already ideally unshrouded for a 2.11” valve then you will likely not gain anything but added compression from running the larger valve,