cam for restrictor plate engine

[WrongWay]

I am building a motor to run in a 2 barrel class that requires a restrictor plate with 1.750 bores. How do I figure out which cam will work best with this restriction ?
Motor is a 454 chevy with 15:1 compression . Carb is 625 cfm split dominator

 

[MaxRaceSoftware]

Motor is a 454 chevy with 15:1 compression
=========================================

Raising CR with restrictor plate is going in correct direction !

but , are you really sure you actually have a measured 15:1 CR ??? because its very hard to get that knid of CR on a BBC 454 cid engine size even with decking and angle-milling
unless you are using other than OEM conventional valve angles/tilt and chamber design .

Many years ago i used the highest CR Speed Pro and TRW
pistons available for BBC-454
TRW and SP said their dome volumes were 50 CC ,
i was coming up with 44.5 CC at most ...it took about
half an hour to actually talk to an engineer at Speed Pro=Sealed Power ..he said they use a term called Effective Dome Volume ...which he said means they pour the dome with clay filling up valve notches ..and so the domes look better than they are .

So during that week many years ago , i also poured Manley's Pro Series Dome for BBC-454 ..they said it was 52 CC,
i told them i was coming up with 48 CC ....about a year later in Manley's next cataloge , i noticed the dome was rated at 50 CC ...another few years later in a newer cataloge , Manley rated the same dome to 48 CC

don't trust the piston people on dome volumes ..pour the domes yourself .

you'll be very lucky to get 15:1 CR with angle-milling and block decking and no flycutting, and small duration spread-center cams ,...thats what it will take to get 15:1 actual on a conventional head 454 Larry Meaux (meauxracing@mindspring.com)
Meaux Racing Heads
MaxRace Software
ET_Analyst for DragRacers

http://www.mindspring.com/~meauxracing/

 

[MaxRaceSoftware]

RPM = CFM / ( CID * .000289352 )

4755 RPM = 625 / ( 454 * .00028952 )
for 1.5 inches Hg vacuum and 100.0 theoretical Ve %

above 4755 RPMs , the engine will pull increasing vacuum
with increasing restriction and Ve % loss , so thats where CR becomes very important

97 to 99 jets for stock unmodified metering/carb (HP-1250)
0 tp 1900 Ft density altitude
Larry Meaux (meauxracing@mindspring.com)
Meaux Racing Heads
MaxRace Software
ET_Analyst for DragRacers

http://www.mindspring.com/~meauxracing/

 

[sbc]

Try this site

http://www.lazercams.com.

They will want all
of the relevant info, such as tire size, gear ratio,
vehicle weight, etc...

 

[WrongWay]

heads are angle milled 0-125 , measure 100 cc.
pistons are 46 cc dome . .010 below deck
.040 copper gaskets
bore is 4.280

I calculated this to 15.33

Am I missing something ?

 

[MaxRaceSoftware]

I calculated this to 15.33

Am I missing something ?
=================================

i come up with 15.334:1 CR same thing
all i meant was its takes angle-milling ,
block decking, a lot of real piston dome volume CC
and short duration cam with/without spread centers depending on actual duration @.050"

do you have a cam in the block right now to check valve-to-piston clearances ??

(spark plug-to-piston notch clearances ?)

have any current cam specs you are running now ?

Call Comp Cams or Cam Motion for cam recommendations for restrictor-plate engine .



Larry Meaux (meauxracing@mindspring.com)
Meaux Racing Heads
MaxRace Software
ET_Analyst for DragRacers

http://www.mindspring.com/~meauxracing/

 

[WrongWay]

I am currently running the engine with a lunati 50210 , but that was my selection for a 4 barrel .

I was trying to understand if there are substantial gains by changing it , or maybe by changing rocker arm ratio on intake or exhaust side .

Also , how does the intake runner volume affect this combination ?