Corona

I figure with your cam size in duration and larger Engine, if lift stayed around the same you'd be in this neck of the woods with this intake or 4 holder...

https://www.yellowbullet.com/threads...sults.1204610/

Lsbmer

Those things have hope. I agree it the turn.
There way better than the china qualcast ls3 ones I tested .

Lsbmer

I didn't see they had work. Still good effort. There is more to be had in the upper lifts.

What where the as from speedmaster #s.
with stock ports.

64post

iTrader: (5)

Oh they had work done alright. Valve seat to combustion chamber ridges were hideous and likely killed low lift numbers. Valve seat to bowl were almost as bad. They come out of the box looking really unfinished yet assembled for use. Never flowed them as cast but I’m sure it would have been a head scratching disappointment, scary looking machines ridges all over the place.

WE TODD DID

iTrader: (2)

I'm poking around on a set for a side project in my spare time. One of the downfalls of this head is you can't put big springs on them. There is more there, just haven't had time to get back on them.

2.20" valve
50* seat angle

.200 148
.300 233
.400 286
.500 353
.600 375
.700 390
.800 402
.900 409

Corona

Is this Cheap Speed Master castings? If so
🤣😂 Gone head on with your Bad ...
Edit... I see Valve size and kinda know bore size? Hopefully a smaller bore 🤗

Btw can you get the Actual valve angle (when u get time)? I've been told 1 thing 12degrees and Read something totally different 15° Was told by a rep yrs ago this was a Misprint.


🙃😁😲

WE TODD DID

iTrader: (2)

Speedmaster casting, 12 degree valve angle.

Corona

I could kiss U.. it reads 15 degrees for the speed Masters🤫 New in my file Same Porter & flow bench used with listed heads above 😉

TFS Ls7 heads
.500 349
.600 382
.650 393
.700 402
.750 405

64post

iTrader: (5)

These Speeddisaster heads are 15*

64post

iTrader: (5)

They’ll accommodate the 1.300” .660 lift spring kit that I have and that’s good enough for what I’m going to do.

Lsbmer

Nice flow curve wedidtod.

Corona

What gets me is yours was sold with 2.165 Valves
There sold with 2.20 valves and lists it as a 15° head. I called and asked yrs ago about it before my purchase and was told it was a Misprint.

Now I wonder Does a Factory LS7 rocker work with a 15 degree Speed Master castings?


https://speedmaster79.com/Chevy-LS7-...-Cylinder-Head

WE TODD DID

iTrader: (2)

I checked mine again because it had been a while since I messed with them. I started second guessing myself but they ARE 12 degree.

Corona

Guys U see why I L O V E this guy, & Don't have to Look No Where. I need to be your neighbor.

Oh yeah did I mention I saved 10% by shopping with Geico. 🤣

64post

iTrader: (5)

I dont really care argue it but the SpeedMaster LS7 heads in my possession are 15*, you can say what ever you like.
The intake valves are 2.165 in diameter and exh. is 1.60”

Corona

Who's Arguing? You have a Head not even listed in Speed Masters catalogs... We Are talking about the head I listed a few post back...No SMOKE, no harm No Foul.

Corona

Where It gets technical 🤣😂 they only Have 2 Rectangular Port Heads. No In-between 👍🤫 all models sold with CNC come from Either 1 or the other.
1)
https://speedmaster79.com/Chevy-LS3-...-Cylinder-Head

2)
https://speedmaster79.com/Chevy-LS7-...-Cylinder-Head