M112 - 300 Build for the '56

[clintonvillian]

Alright guys I need to order a cam...

Think I am just going to go flat tappet since the gear issue isnt resolved.

What do I need to order?

 

[pmuller9]

What is the max rpm of the power band

 

[clintonvillian]

1800-4500/5000

1.72 rockers
2.02 intake
1.72 exhaust

Springs 1.9/110, 1.4/270, 1.3/300, 1.225/ bind

 

[pmuller9]

Crower 284HDP (19205)
.509”/517” 220/222 284/290

The lift is with a 1.6 ratio rocker.

What 1.72 rocker arms are you using?

 

[clintonvillian]

Crower 284HDP (19205)
.509”/517” 220/222 284/290

The lift is with a 1.6 ratio rocker.

What 1.72 rocker arms are you using?

Speedpro...I think. Ill need to verify.

Is that an off the shelf cam? For a supercharged engine?

 

[pmuller9]

It is a catalog specification that we know from use has a power band from 1000 to 5000 rpm.
All cams are ground per order so there is no longer an “off the shelf” camshaft.
The only thing I would change for a supercharger is to make the LSA 112 degrees instead of 110 degrees.

I was curious if the rocker arms are Chevy or Ford.

 

[clintonvillian]

It is a catalog specification that we know from use has a power band from 1000 to 5000 rpm.
All cams are ground per order so there is no longer an “off the shelf” camshaft.
The only thing I would change for a supercharger is to make the LSA 112 degrees instead of 110 degrees.

I was curious if the rocker arms are Chevy or Ford.

CHEVROLET BIG BLOCK 7/16” 1.72 07-1114-16

Engine Pro...

https://www.enginepro.com/downloads/newdata/EPG_RockerArms.pdf

 

[clintonvillian]

Cleaning up the valve cover, just going over some details...had to shorten it due to the firewall.

With one thread engaged on the head stud and lock, it is flush with the top. By the time they are torqued down I should have plenty of clearance.

Cleaned up the bolt holes...when I made it I didn't have my mill....got a few off center.

 

[clintonvillian]

Should I weld the push rod guides together?

 

[bflippinw]

I found .100 shorter poly locks at summit. I believe pro comp brand.

 

[clintonvillian]

Could I thread the valve cover and use this???

Then just thread it on the opposite end for an AN fitting to run to the catch can?

 

[pmuller9]

Should I weld the push rod guides together?

View attachment 17173

If you weld them together it keeps them from turning when they are torqued in place.

 

[bubba22349]

Hi pmuller9, didn't you need align that type of Push Rod Guide Plate first before you welded them?

 

[pmuller9]

Hi pmuller9, didn't you need align that type of Push Rod Guide Plate first before you welded them?

Yes. I built a fixture to hold the plates at the correct center to center for welding but if you get them aligned on the head before torquing them, you could weld them there.

 

[clintonvillian]

Yes. I built a fixture to hold the plates at the correct center to center for welding but if you get them aligned on the head before torquing them, you could weld them there.

Should just be center of valve stem to valve stem...right?

 

[pmuller9]

Should just be center of valve stem to valve stem...right?

No
The lifter spacing is wider than the valve spacing so the pushrods are at an angle.
The guide plate spacing will be about .020” more than the valve spacing.
You will need to install the pushrods and center the rocker arms on the valve stem then measure the center to center on the guide plates.
My center to center was 1.940” but yours may vary.

 

[clintonvillian]

No
The lifter spacing is wider than the valve spacing so the pushrods are at an angle.
The guide plate spacing will be about .020” more than the valve spacing.
You will need to install the pushrods and center the rocker arms on the valve stem then measure the center to center on the guide plates.
My center to center was 1.940” but yours may vary.

Sheww....glad I asked....

 

[clintonvillian]

Could I thread the valve cover and use this???

Then just thread it on the opposite end for an AN fitting to run to the catch can?

View attachment 17174

Do you guys see any reason this will not work?

I plan to use this in the rear of the the valve cover, and just an "empty" -10 to -6 AN fitting in the front. Both vented to catch cans, prior to being recirculated through the engine.

I just don't like the idea of dumping oil and crap back through the throttle body and supercharger. Or am I overthinking it?

 

[Frank]

Do you guys see any reason this will not work?

I plan to use this in the rear of the the valve cover, and just an "empty" -10 to -6 AN fitting in the front. Both vented to catch cans, prior to being recirculated through the engine.

I just don't like the idea of dumping oil and crap back through the throttle body and supercharger. Or am I overthinking it?

I will be in a minority here- I like your plan. I have run more than one automotive engine with only a "draft tube", no "positive" ventilation. No catch can. At 267,000 miles under VC was clean as new. If I return to EFI on the '90 truck at overhaul, it will not pull the oily mess into the dry intake, draft tube again. All MPI intakes are very dirty, between EGR and the oily blow by. Never mind your turbine.
Turbo diesels do not inhale blow by upstream of the turbo. For your application, draft tube/catch can- yes. Just use large enough fittings and tubes to keep minimum +pressure.

 

[powerband]

always into the forced induction threads, i'm an outlier in this forum and maybe missed part of the forced induction blowby' under boost options posts.

$.02 :

'Old School' used pitot/venturi line in exhaust to suck out/draw off blowby instead of re-circling.


Should be into catch cans, SC'd Mav 250 six has run couple years with two open vent filters on VC and the blocked off fuel pump boss on block has a 1" vent pipe. The larger the better for any venting under boost.

.


( S.O. doesn't like for it to go into boost, blowby fumes... )

hav e fun

BTW - with turbo at @ 1 Bar: