Recent Posts

Pages: [1] 2 3 ... 10
1
Engine/Drivetrain / Re: Valve Cover PCV Valves and Breathers
« Last post by Mike81K10 on Today at 06:59:48 PM »
bd, I bought these from summit and would like to know if you think they will be sufficient:
Billet Specialties Valve Cover Breathers BLK21220 and Billet Specialties Valve Cover Breathers BLK20220
2
Engine/Drivetrain / Re: Valve Cover PCV Valves and Breathers
« Last post by bd on Today at 02:38:55 PM »
The PCV system is beneficial to overall engine health and service life.  The PCV valve purges crankcase vapors, which are a mixture of air, oil, moisture, and combustion chamber vapors that escape past the piston rings and imposes a slight vacuum on the crankcase (CC).  It helps control moisture accumulation that leads to acid and sludge formation.  The PCV valve fits between either valve cover (or the lifter valley roof) and a balanced manifold vacuum port via a reinforced-wall 3/8" rubber hose.  The valve body contains a spring-loaded sliding check pintle that regulates the flow of CC vapors into the intake manifold where it mixes with the incoming intake charge for subsequent combustion in the cylinders.  The pintle is designed to float between opposing seats against light spring pressure such that it closes toward its inlet (valve cover side) when manifold vacuum is low (e.g., engine off, WOT, and intake backfire) or closes toward its outlet (intake manifold side) when manifold vacuum is greatest (e.g., engine idle RPM and deceleration).  The spring modulates the pintle position between its seats according to the pressure differential on either side of the valve, hence PCV valves are calibrated according to application.  For the greatest CC ventilation benefit, the PCV valve is inserted into a small baffled chamber in the roof of one valve cover and a vented breather is inserted into a small baffled chamber in the roof of the opposite valve cover.  Alternatively, the PCV valve can be centrally located in the lifter valley roof and then both valve covers are vented.  The baffled chambers in the roofs of the valve covers help to isolate the valve and breather from direct exposure to liquid oil thrown from rapidly moving valve train components.  The best valve cover breathers filter incoming air to minimize oil contamination by abrasive particles.  Filters can be internal or external to the breather, however, external filters are more easily serviced.  Due to currently governing emissions laws, the OEM plumbing configuration must be maintained.

Fixed orifice CC ventilation is unique to select engine applications such as the Jeep 4.0L inline six.  IMO PCV systems are superior since they are dynamic and adjust to variable operating conditions on a real-time basis.
3
Engine/Drivetrain / Re: SBC 350 recipe, looking for advice.
« Last post by berserk on Today at 12:21:00 PM »
Here is my SBC recipe currently sitting in my K10. It should be around 9:1 compression and I can run 87 octane no issue.

Bone stock rebuilt short block
Bone stock vortec heads
"Torque cam" with 488 max lift to accommodate for lift restrictions on vortec heads. I can get the cam card if you really want me to.
Vortec aluminum intake
600 CFM Edelbrock
Hei
Headers

This combo has served me well for 10 plus years, it has good off throttle response and a usable torque band.
4
Engine/Drivetrain / Valve Cover PCV Valves and Breathers
« Last post by Mike81K10 on Today at 11:28:30 AM »
I have never thought much about the PCV valves. I always bought and installed them into the valve cover without paying much attention to the specs. Was reading some material online and I understand that the PCV valve can cause the RMS to leak oil, there can be oil blow out, and other problems without the proper valve cover venting. Saw something about a fixed Orifice, etc.

Can someone educate me on this subject. I want to ensure I don't make a mistake on my engines pcv valve or valve cover venting. I bought a; Billet Specialties Valve Cover Breathers BLK21220 and Billet Specialties Valve Cover Breathers BLK20220. Should I return them and get something else?
5
Rear Drivelines, Drive Axles and Gearing / Re: Locking diff.
« Last post by whipper.snapper on Today at 10:32:25 AM »
Great info guys, thanks.


Sent from my iPhone using Tapatalk
6
Engine/Drivetrain / Re: SBC 350 recipe, looking for advice.
« Last post by kopeck on Today at 08:26:36 AM »
Ditch the heads, bump the compression up, definitely bigger cam than he suggested to make those heads work for you. If you are keeping manifolds you can still improve the exhaust system. Intake manifold upgrade is a good idea. Summit is a good source for everything you need.

Do you think the SR Torquers are worth the extra money over, say, the more generic Summit head?  67cc or 76cc chambers?  I want to run 87 octane. 

Is there a standard cam you would suggest?  I know that's a very open-ended question.

K

7
Engine/Drivetrain / Re: 357 (350 - .40 Over) Build Questions Etc
« Last post by Mike81K10 on June 22, 2024, 07:41:51 PM »
Been going a bit slow, my wife's been ill. The manufacturer of my short block put a threaded plug in the oil sensor hole on the top back of engine block with red permanent Loctite. I almost stripped it trying to get it out. Did not want to use a torch because it might damage the intake manifold and perhaps other stuff. Got lucky! Decided to try using my soldering gun since it gets much hotter than my soldering iron. Held it on the plug for about 4 minutes and the plug came out without much trouble.

Went ahead and installed the distributor and ignition wiring, the oil sensor on top of the engine and above the oil filter. Will work on the headers next I think.

Was thinking about using my Rochester Carburetor and don't know if that is wise or should I buy a Holly 750 cfm carburetor. I don't even really know what cfm the Rochester carburetors are. I have two that is practically new (barely used).
8
Engine/Drivetrain / Re: SBC 350 recipe, looking for advice.
« Last post by VileZambonie on June 22, 2024, 10:02:48 AM »
Ditch the heads, bump the compression up, definitely bigger cam than he suggested to make those heads work for you. If you are keeping manifolds you can still improve the exhaust system. Intake manifold upgrade is a good idea. Summit is a good source for everything you need.
9
Engine/Drivetrain / Re: SBC 350 recipe, looking for advice.
« Last post by Mr Diesel on June 22, 2024, 08:03:38 AM »
Or save yourself the time and aggravation by just dropping in one of these:

https://www.gmperformancemotor.com/parts/19432780.html
10
Probably need a new one to completely get rid of the flutter. All it takes is one tiny spot snagging inside on a kink, bend, or cable strand frayed. It is also critical that you don't kink the new one putting it in.
Pages: [1] 2 3 ... 10