SpeedMaster_ProCompElectronics_320CC_BBC_Heads

[maxracesoftware]

SpeedMaster_ProCompElectronics_320CC_BBC_Heads
Flow tests results :

SpeedMaster_ProCompElectronics_BBC_Heads.jpg

SpeedMaster_ProCompElectronics_BBC_BPD_Port_after_new_VJ_Porting.jpg

SpeedMaster_ProCompElectronics_BBC_BPD_Port_out_the_box.jpg

SpeedMaster_ProCompElectronics_BBC_GPD_Port_out_the_box.jpg

[maxracesoftware]

SCE_IntakeGasket.jpg

StockIntakeValveJob.jpg

StockIntakeValveJob2.jpg

StockExhaustValveJob.jpg

[maxracesoftware]

IntakeSeatInsertBottomRidge.jpg

FlatChamberRingAroundValves.jpg

StockIntakeValveJob3.jpg

StockExhaustValveJob2.jpg

IntakePortGPD.jpg

IntakePortBPD.jpg

[maxracesoftware]

BronzeGuides.jpg

PartNumber.jpg

StockExhaustPort.jpg

StockExhaustPortCastingLine.jpg

StockExhaustPortExit.jpg

StockExhaustBowl.jpg

[maxracesoftware]

StockIntakeBowlBPD.jpg

StockIntakeBowlGPD.jpg

StockChamberHeadGasketSeal1.jpg

StockChamberHeadGasketSeal2.jpg

StockIntakePortPairGasketMatchup1.jpg

StockIntakePortPairGasketMatchup2.jpg

StockChamberHeadGasketSealOverHang1.jpg

[maxracesoftware]

StockFlowTest1.jpg

StockFlowTest2.jpg

StockFlowTestDialIndicator.jpg

StockIntakePortPairGasketMatchup3.jpg

IntakePortMatch1.jpg

ChamberReworkNewValveJob1.jpg

[maxracesoftware]

ChamberReworkNewValveJobCloseup1.jpg

FinalChamberHeadGasketSealOverHang1.jpg

FinalChamberHeadGasketSealOverHangComparison.jpg

IntakeBowlPortingBPD.jpg

IntakeBowlPortingGPD.jpg

[MELWAY]

What are your thoughts on EX port? I feel it’s too big for most applications
And I bet we can’t grind that spring seat bump right out of intake roof

[MELWAY]

What are your thoughts on EX port? I feel it’s too big for most applications
And I bet we can’t grind that spring seat bump right out of intake roof

[maxracesoftware]

What are your thoughts on EX port? I feel it’s too big for most applications
And I bet we can’t grind that spring seat bump right out of intake roof

the Stock Exhaust Port Exit dimensions are a "large size" to me also
and i didn't measure how thick the Spring Seats pad inside the Intake Ports were
but i'm pretty sure you cannot remove too much of it , especially if you mill Spring Seat for larger OD Springs or Cups !

one more Pro : all the Intake and Exhaust Seats were all their same heights and all sealing

some more Cons : some Intake Port Entries were off in layout , i tried the SCE Int Gasket, FelPro, and Mr Gasket
all 3 Intake Gaskets showed some Intake Port Entries were off in layout
and what's with about 1/2 inch too low Roof Line at the Entries ??
i guess they think it can "mate up" to an enlarged roof height on an Oval-Port Manifold ??
or if the User wants to raise the Roof Entry to a typical Rectangular Port height ??, he can grind the Roof height to Rect Port Height
.... i guess they want to give those 2 Options ??

these Heads are replacing newest version #861 Chevy Castings ,
so the Blower Manifold was already sized to the SCE Rect-Port Intake Gasket

Edit : i almost forgot to Post that the Intake Valve Tilt was = 3.0 degrees instead of typical 4.0 degrees
( main reason you had so much distance/room between Intake and Exhaust Valves max Lift at Overlap )
and Exhaust Valve Tilt was around 3.75 to 4.0 degrees ... i forgot to look at the final Exhaust Valve alignment degree on the Vertical Mill

main reason for Posting about these Heads :
was to Post Flow Numbers .... as i found it was impossible to find any Flow Numbers on these Heads on the Internet
...nothing at SpeedMaster / ProComp Electronics

 

[1980RS]

Nice work to take a poorer head and make them into a great set of heads. Great work!

[steve cowan]

StockFlowTest1.jpg
StockFlowTest2.jpg
StockFlowTestDialIndicator.jpg
StockIntakePortPairGasketMatchup3.jpg
IntakePortMatch1.jpg
ChamberReworkNewValveJob1.jpg

Larry,
Even your layout dye and scribe marks are perfect
A couple of questions if you don't mind-
I see you cut the seat only first??
Also you always do alot of chamber work and fine detail around the spark plug,do you worry about chamber size getting to big or do you do what is required and angle mill the chamber size you want to set due to compression?
One more question if you don't mind- what are your thoughts on flat milling heads.
I had a bad experience a few years ago where machine shop took out half the top cut on valve job,killed the head at 0.500" lift,only way I could salvage was go a 50 deg and sink it.

[maxracesoftware]

StockFlowTest1.jpg
StockFlowTest2.jpg
StockFlowTestDialIndicator.jpg
StockIntakePortPairGasketMatchup3.jpg
IntakePortMatch1.jpg
ChamberReworkNewValveJob1.jpg

Larry,
Even your layout dye and scribe marks are perfect
A couple of questions if you don't mind-
I see you cut the seat only first??
Also you always do alot of chamber work and fine detail around the spark plug,do you worry about chamber size getting to big or do you do what is required and angle mill the chamber size you want to set due to compression?
One more question if you don't mind- what are your thoughts on flat milling heads.
I had a bad experience a few years ago where machine shop took out half the top cut on valve job,killed the head at 0.500" lift,only way I could salvage was go a 50 deg and sink it.

"I see you cut the seat only first??"

i do my Valve Jobs 1st as everything + my templates
are centered off the Valve Stem and need to line up with the Valve Seat
so all my Bowl + Short Turn Curve Porting is based-off the Valve Job

"Also you always do alot of chamber work and fine detail around the spark plug,
do you worry about chamber size getting to big or do you do what is required
and angle mill the chamber size you want to set due to compression?"

i try to round-off any sharp edges or exposed Spark Plug threads in the Chamber .
The very thing i forgot to Post about those Heads was :
i did not like the very flat band around both the Intake and Exhaust Valves ,
the flat bands are about 1/4" inch or so wide all around ,
and when i finished the Valve Job , the actual Seats Top Angle were a little above the
flat band , by the time i blended the Top Seat Angle into the ridge flat band,
i lost about half my Top Angle width
the Heads would have picked up a little mid the hi Lift Flow Numbers

One more bad thing : if i had to do another Pair of those Heads
i'd use 2.350 or 2.325 Intake Valve OD
because even going to larger 2.300 was not enough to fully get a great transition
below the bottom of the Seat Insert ,
the aluminum Bowl diameter was still greater than the Seat Insert OD at that point
it caused me to curve or loop the smaller bottom Angle into the larger aluminum Bowl .
.... you cant see it on the Short Turn Pics , because its more like a U-shaped ring ridge,
by the time it get to the Short Turn Curve its blending OK !

I Angle-Mill everything i do , at least i try to ,
sometimes its a 0.000-0.080 Angle Mill with another 0.020 off flat mill , etc
It depends on the Chamber + if the Intake Valve is moving towards the Cylinder Wall at higher Lifts .

Also i'll wait till i've Angle-Milled the Heads to do the final tuning of the Short Turn Curve ,
if you don't do that ... its like your Post : Angle-Milling can hurt Flow Numbers !
Most times i try to leave 0.005 to 0.015 left for any milling later on Valve Job or Head refreshing

On more modern Pro-style Heads , its better to flat-mill
as the Head is already pretty maxed-out design as far as Valve Angle Degrees,
you need a lot of Top Angle transition into Chamber or a part of the Chamber angle
Aka: SB2

Those BBC ProComp Heads : i did the bare-minimum Bowl porting or clean up,
especially on the Short Turn Curve ... its nowhere a max-out Bowl Port Job !!!

i went back and checkout the Vertical Mill's Tilt Angle setup
it was still setup for Intake side ....
i made a Angle Degree mistake in above Post
the re-check shows 3.5 to 3.6 degree Intake Valve Tilt
as checked with Digital Protractor + Vertical Mill's Degree Angle
... so i'm guessing the Exhaust Valve was also around 3.5 to 3.75
but both were not the typical 4 degree tilts

i have some old sort of rare Round-Port Open-Chamber BBC Winters SnowFlakes Heads
to do a Valve Job + Mill + some cleanup Porting in Ports and Chambers
... should be finished by this weekend , i'll Post Flow Numbers + Specs

these are Flow Numbers + Pics of the Chevy 14044861_BBC RectPort Heads the ProComps are going to replace
because of some very tiny cracks across most Chambers

Chris_14044861_BBC_RectPort_Aug_9_2022.jpg

14044861_BBC_RectPort_DialIndicator.jpg

14044861_BBC_RectPort_Flowbench1.jpg

14044861_BBC_RectPort.jpg

14044861_BBC_RectPort_Flowbench2.jpg

 

[steve cowan]

StockFlowTest1.jpg
StockFlowTest2.jpg
StockFlowTestDialIndicator.jpg
StockIntakePortPairGasketMatchup3.jpg
IntakePortMatch1.jpg
ChamberReworkNewValveJob1.jpg

Larry,
Even your layout dye and scribe marks are perfect
A couple of questions if you don't mind-
I see you cut the seat only first??
Also you always do alot of chamber work and fine detail around the spark plug,do you worry about chamber size getting to big or do you do what is required and angle mill the chamber size you want to set due to compression?
One more question if you don't mind- what are your thoughts on flat milling heads.
I had a bad experience a few years ago where machine shop took out half the top cut on valve job,killed the head at 0.500" lift,only way I could salvage was go a 50 deg and sink it.

"I see you cut the seat only first??"

i do my Valve Jobs 1st as everything + my templates
are centered off the Valve Stem and need to line up with the Valve Seat
so all my Bowl + Short Turn Curve Porting is based-off the Valve Job

"Also you always do alot of chamber work and fine detail around the spark plug,
do you worry about chamber size getting to big or do you do what is required
and angle mill the chamber size you want to set due to compression?"

i try to round-off any sharp edges or exposed Spark Plug threads in the Chamber .
The very thing i forgot to Post about those Heads was :
i did not like the very flat band around both the Intake and Exhaust Valves ,
the flat bands are about 1/4" inch or so wide all around ,
and when i finished the Valve Job , the actual Seats Top Angle were a little above the
flat band , by the time i blended the Top Seat Angle into the ridge flat band,
i lost about half my Top Angle width
the Heads would have picked up a little mid the hi Lift Flow Numbers

One more bad thing : if i had to do another Pair of those Heads
i'd use 2.350 or 2.325 Intake Valve OD
because even going to larger 2.300 was not enough to fully get a great transition
below the bottom of the Seat Insert ,
the aluminum Bowl diameter was still greater than the Seat Insert OD at that point
it caused me to curve or loop the smaller bottom Angle into the larger aluminum Bowl .
.... you cant see it on the Short Turn Pics , because its more like a U-shaped ring ridge,
by the time it get to the Short Turn Curve its blending OK !

I Angle-Mill everything i do , at least i try to ,
sometimes its a 0.000-0.080 Angle Mill with another 0.020 off flat mill , etc
It depends on the Chamber + if the Intake Valve is moving towards the Cylinder Wall at higher Lifts .

Also i'll wait till i've Angle-Milled the Heads to do the final tuning of the Short Turn Curve ,
if you don't do that ... its like your Post : Angle-Milling can hurt Flow Numbers !
Most times i try to leave 0.005 to 0.015 left for any milling later on Valve Job or Head refreshing

On more modern Pro-style Heads , its better to flat-mill
as the Head is already pretty maxed-out design as far as Valve Angle Degrees,
you need a lot of Top Angle transition into Chamber or a part of the Chamber angle
Aka: SB2

Those BBC ProComp Heads : i did the bare-minimum Bowl porting or clean up,
especially on the Short Turn Curve ... its nowhere a max-out Bowl Port Job !!!

i went back and checkout the Vertical Mill's Tilt Angle setup
it was still setup for Intake side ....
i made a Angle Degree mistake in above Post
the re-check shows 3.5 to 3.6 degree Intake Valve Tilt
as checked with Digital Protractor + Vertical Mill's Degree Angle
... so i'm guessing the Exhaust Valve was also around 3.5 to 3.75
but both were not the typical 4 degree tilts

i have some old sort of rare Round-Port Open-Chamber BBC Winters SnowFlakes Heads
to do a Valve Job + Mill + some cleanup Porting in Ports and Chambers
... should be finished by this weekend , i'll Post Flow Numbers + Specs

these are Flow Numbers + Pics of the Chevy 14044861_BBC RectPort Heads the ProComps are going to replace
because of some very tiny cracks across most Chambers

Chris_14044861_BBC_RectPort_Aug_9_2022.jpg
14044861_BBC_RectPort_DialIndicator.jpg
14044861_BBC_RectPort_Flowbench1.jpg
14044861_BBC_RectPort.jpg
14044861_BBC_RectPort_Flowbench2.jpg

 

Thanks Larry ,
I see the 'band' you are referring to,I think that is a common thing with pro- comp.
I have a pro- comp head I cut up and the chamber looks the same around the valves.makes it hard if you want to use a 40deg TC.
my Dart 180 SHP heads are similar so I did a 40 degree and a smaller 35 degree for the top cuts.i have often thought of welding a chamber and see if it can transition from the TC to edge of chamber steeper but probably not worth the time,effort for a 23 degree head.

[bobmc]

wonder if their intake manifold matches that lowered roof?