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Here's some more thoughts on small block rocker shaft/rocker arm geometry. I'll only be showing geometry on the long (valve side) of the rocker arm. Geometry on the short (pushrod side) of the rocker arm is not being discussed. I'm working through some set-ups using several rocker options on...

Anyone ever measured the oil pressure in the rocker arm shafts? Wondering how different rocker arms would affect the oil pressure (and even the oil level) within the shaft. Bushed bearing vs needle bearing. Shaft with bottom holes only vs top and bottom holes. Banana grooves vs without. Lots...

Driving through Middlesboro, KY on Monday on Hwy 25E I found myself following a new body style Ram Dakota 4 door pickup truck. Back of the truck had a Dakota emblem and a V8 emblem. I didn't think much of it at the time other than looking closely to make sure I was seeing it correctly. I had...

This post is to show a comparison of the INITIAL contact location of several different SBM rocker arms on a few different heads with their stock valves in the closed valve position. Please read that carefully because that is all that is being demonstrated here. This is not a demonstration of...

I ran across this issue when checking some rocker geometries this morning. When bolting a rocker shaft into the saddle on a SM small block head, I noticed the shaft wiggled (quite a bit) in the saddle. I went ahead and bolted the shaft in then checked the shaft to saddle clearance with a...

Can anyone post a picture of what they know is a factory valve job on an X head? I just picked up a set of 1967 production date heads that are in quite good shape, but I think they may have had 1 valve job. I have 4 angles on the intake and some non-concentricity. I believe the factory valve...

Looking for a W5 head, even if it's a 'leaker', or damaged. Would need to be an unported, unmolested head to be used for flow bench testing.

Spent 3 1/2 hours in a parking lot last night waiting for the starter on my 65 Dart to cool down. Only after I had called a tow truck did it start. So I have to do something about the heat soaked starter. Engine is a 360 with TTI headers. As can be seen in the pictures, the header heat tape...

Working on some heads for the @NC Engine Builder cylinder head dyno testing. Engine break in and first testing is with bone stock Speedmaster heads. We also have several other out of the box heads to test, but it would also be nice to test a few modified heads. There are several modifications...

Here's an interesting comparison of 4 tests on Trick Flow Ports. Two are with a 2.02 valve and two are with a 2.08 valve. There are many points to be made here, but I'll start with three. First, look at test 1231 in green, which is a totally stock port. This port at 308 cfm is the highest...

Looking for 1 head (or a pair) of used or damaged Trick Flow 190s. These would be used for porting so perfect condition is not needed.

Just finished porting the Victor 340 for NC Engine Builder's dyno test. First picture shows the stock intake with a 4150 carb gasket line in Sharpie. There is a lot of metal in the way that needs to be removed. Next picture shows the intake runners with a standard Felpro 1213 gasket line. As...

Looking for a pair of Edelbrock or Speedmaster small block Mopar heads ported by @pittsburghracer. Prefer 2.08 valve size, but would also consider 2.055.

There's been a little talk about the Promaxx vs Speedmaster heads lately. I got my hands on a Promaxx as cast SBM head for the first time yesterday. Thought it would be interesting to compare the Promaxx vs Speedmaster vs Edelbrock stock castings. I flow tested all 3 back to back to back this...

I'm working on a couple of heads/ports starting with bare Speedmaster heads. Pictured are the specs on two different flow bench runs. If these heads are used on a 408 for street or street/strip, which would you choose? In my mind the answer is clear, but I know some of you racers and dyno...

Here are some results from recent testing I've been doing on a Speedmaster head with 2.02 intake valve. I've enjoyed digging into the data so I thought some of you guys may like it. The methodology is somewhat scattered because I'm looking for flow in certain areas of the curve. That approach...

Just stumbled across this guy on YouTube. He has quite a bit of drag racing and NASCAR experience. Some of the videos are old, but I found the tech talk to be quite good. He also has website dambest.com and a Facebook page. Some of you guys might enjoy.

Looks like I'm going to need a pushrod around 7.375" long for the shaved head 360 build. Is there any reason that an LS pushrod like this would not work? About 330 lb of spring pressure over the nose. Do all 5/16" ball-ball pushrods have the same shape on the ends? BTR LS CHROMOLY PUSHRODS...

Thought I would cc a port in the cast iron heads I've been working on. Very first intake port I try has a leak. As seen in the picture, there is a very small pin hole in the casting. Metal thickness at the hole appears to be at least 0.140" according to my import ultrasonic gage. What are...

Working on some SBM iron heads and need to shim the valve springs about 0.100". That is too much shim to put under the valve spring to keep the spring accurately located. I'm using 3/8" stem 1 groove valves. Does anyone know of a negative height spring retainer? Comp has -0.050" locks. The...

Changing cams in 1979 Dodge truck with 360 engine. Hoping I do not have to pull the motor. Radiator, water pump and all auxiliaries are removed or out of the way. Is draining the radiator and removing the water pump sufficient to get coolant level low enough to remove intake and heads, or do...

1979 Dodge truck with stock ignition system. 1979 factory service manual says coil side of the dual ballast resistor should be 0.5-0.6 ohms. My resistor measures 1.4 ohms. Could this be a problem? Low coil voltage?

I recently purchased a 1979 Dodge truck with a 360 and 727 trans. Block is 1979, hydraulic FT cam and heads are probably 1979 as well. I do know that the engine has been rebuilt and I am quite sure the cam is not stock. Truck had been sitting (indoors) for 10-12 years. Barely ran when I...

I have a pair of small block mopar heads on a 360 engine that I cannot identify. The block is from 1979, the intake manifold is 1969ish, so no real clues there. The heads are cast iron and do not have the typical 7 digit casting number under the valve cover, nor do they have the typical 340 or...

This conversation was started in another post and moved here to avoid the hijack. PBR’s post above sums up his idea about taking SM heads, getting a 2.055 valve job done by a machine shop, then making the other modifications and improvements at home with tools that are inexpensive and readily...

I hate watching technical Youtube videos when the guy on the video really doesn't know what he's talking about. Today, I may be that guy. The Bernoulli equation as it relates to intake ports is a complicated subject and I do not pretend to understand much of it. With the help of some guys on...

This topic came up in another post so I'm just starting a new post on this topic. The question was asked by @dusterbing the peace if testing had been done comparing a CNC ported ribbed finish to a smoothed/sanded finish. Here's one initial test on a factory CNC'd Speedmaster intake port. As a...

Speedmaster SBM head with 2.02 intake valve on the flow bench. Let's assume this head is going on a large stroker motor and we're looking for high flow. I'm trying to find the flow limits of the head and understand why flow stops increasing. Throwing all the cheat tactics I can think of at...

Not really an A-Body thing, but a cool engine none the less. My first car was a 1966 Coronet 440 with a 318 poly. My father bought it new. I've had the heads in the shop for quite some time, and I finally took the time to rig up the valve opener and flow test the intake. Small ports and not...

Running some more flow tests on the SBM Speedmaster head. This port is 185cc, 2.02 valve, 50 deg seat with 40 deg top cut. Valve is sunk into the head about 0.090" to achieve a top cut of about 0.200" to 0.250" wide. As mentioned in some of my other posts, I'm trying to understand what...