YOU’VE BEEN WARNED. Now you are going to have to figure out how to explain why there will be Shelby Mustang GT500 in your driveway to your significant other.
Have you even given this a thought? Nope, not me either.
But here’s why you should and why you shouldn’t go cheap.
Engine bearings have the dual function of reducing friction between a rotating part of the engine (the crankshaft) and the stationary part (the main caps and engine block) and supporting the crank.
Because of the stresses caused by the explosions inside the internal combustion engine, the bearing material must be extremely strong, so a durable metal is required.
Engine bearings are small and relatively inexpensive components of internal combustion engines however failure of an engine bearing commonly leads to serious reconditioning works of the engine including its disassembling, regrinding the crankshaft and replacing the bearings. Sound like fun? No. And we all know that it’s not cheap to rebuild, so let’s do it right and not cut corners in this area.
So what should you get? Well considering that there are all kind of ways to destroy your bearing, like dry starting (no oil coating) some of the following:
Yes it’s true bearing take a beating. Here if you go cheap, especially if you are racing, you go home.
So double up on the cash because quality bearings like Michigan 77 or Federal Mogul competition will cost you twice as much. Pay now or rebuild sooner.
If there is one challenge to the beehive revolution, it’s the perception of the masses. While most engine builders and performance enthusiasts know that the beehive works to improve their engines, many don’t realize the true benefits. Some established enthusiasts are confused and concerned that the smaller valve retainer and single spring used in the beehive system are capable of handling the same high performance loads carried by the conventional spring with two coils.
Beehive springs are a precision component just like any part you select for your engine. Using a tech line expert to help find just the right Beehive springs is critical to your engine’s ultimate performance and durability.
“There are some very knowledgeable engine builders who don’t understand how a single coil spring can be better than a dual conventional spring,” stated Thomas Griffin Head valve spring engineer for COMP Cams.
“The fact is the beehive springs, by virtue of the ovate spring shape and a variety of internal upgrades is compatible with virtually any application where a dual spring is used. That includes some engines with mechanical roller camshafts. The key is to review the required camshaft load and assess the aggressiveness of the camshaft.”
The key profile consideration of a camshaft can be denoted in the camshaft profile section. By reviewing the duration specs for your potential camshaft at 0.050-inch lift and again at 0.200-inch lift, the shape of the lobe can be projected. These are the key figures engineers use to determine beehive spring compatibility. Currently beehive springs for camshafts measuring up to 0.750-inch lift are available.
COMP Cams engineers used a Spintron machine to determine exactly what happens with valve spring dynamics at all levels of engine rpm. This high tech sensor was installed after cutting the cylinder head to make room. The Spintron data noted improved performance at reduced valve seat pressures, among other benefits previously mentioned.
This is the series where I list up the power plant offerings for the year.
Now you would think that being a GM division that Oldsmobile would have the 350 and the like, but the had their own unique engines.
First up was the 225 cid. Oh…a straight six….NO…..a V6!!!!! This was an iron blocked overhead valve engine. The bore and stroke were 3.75″ x 3.40″ and with a compression of 9.0:1 it laid down 155 hp. It had four main bearing and topped with a 1 barrel Rochester Type BC one barrel. This was the lowest level engines and refered to as the F-85 and Vista Cruiser series.
Next up is the smallest of the V8’s offered that year, the 330 cid also in the F-85/Cruiser series. It was an iron block engine as well. The compression was 9.0:1 with a bore of 3.939 and stroke 3.39″. When ou topped that off with a two barrel Rochester Type 2GC carb you could manage a stout 250 hp.
WOW…I apologize for leaving you hanging for so long without finishing this interview.
Here is the link for Part I.
So while at first glance it did appear that there were just newly built vintage shaped bodies, placed on the C6 chassis, a really close look and you can see something very different about the shape.
The door is clearly still a C6 and the windshield is C6.
So you can tell that they didn’t just pull off that old C6 body and dump it out behind the barn.
You can tell this is the original C6 hatch. The rear end is has been changed but where the hatch meets the roof line is the same.
So how do they do it?
Well the make body panels that fit to the framework of the exiting parts. For instance, the rear hatch is striped of the outer panels leaving just the framework and the split window panels are fitted. The rear panel is pulled off and the rear panel with the split bumpers is placed on.
Jim showed me the shop photos of a C6 – skinned. They also retrofit C5.
C5 Rear hatch frame. The split window panel is manufactured by Karl's Kustoms to snap right on.
It is a pretty intense process.
They all the do is custom bodies? Oh wait until you see what’s next. (Yes I promise I’ll get right to it.)
Ok, so one engine plant is located in Canada and the other Ohio. What else is different?
The 351 Windsor (biggest displacement of the Windsor family – which included the 289 and 302) had a beefier block than the Cleveland, which in theory allowed for more abuse and longer life-span.
The Windsor also came first in the history being used from 1969 to 1998.
The Cleveland was used from 1970 to 1974 (much, much shorter run), with 1971 bringing 351 C Cobra Jet.
Unlike the Windsor the Cleveland had canted multi-grooved valves. It also required larger rounded intake and exhaust ports.
There is another major difference and that was how the engined were cooled. No we aren’t talking water vs. air (these weren’t VW engines) we are talking about water flow.
Like the 289 and 302 the 351W used a front cover and water existed the intake manifold face of the cylinder head through intake manifold to the radiator. The 351C don’t have the front cover. The block is extended and the covered with a flat stamping. Water existed the combustion face of the head and into the block and then to the radiator. This is important to note, particularly for me. Why:
The Cleveland and Windsor heads are interchangeable only with modifications to the water passage. I currently have a set of 351C Cobra Jet heads to put on my Windsor family 302. I’ll have to have those mods done when I have the heads rebuilt.
Not the same location as the 302 Windsor.
There you have the basic differences between the Cleveland and Windsor families.
Well, I’m officially depressed. No it’s not because of the holidays, or the rapidly approaching June when I’ll move too far into the 50’s to be able to fool myself that I’m just barely 50, nope none of those things.
I’m looking at GM’s (bastards!!) Performance Catalog and all the shiny things in it. Like the ported LS3 heads, and the LS376 – 525…yes 525 hp in a crate engine, drop in and drive. I realize two things, I need an older Chevy to play with (or upgrade the C6 Vette) and that I’ll need a second job if I even want to touch any of this stuff and where will I live when the better half finds this stuff laying around the garage? (Tell me you aren’t depressed now?!?!!…It’s ok…admin it!!!)
Note: It’s gonna get worse… I have the Ford performance parts catalog as well…all I can say is thank GOD!!! I don’t have a Morpar to drive around….oh….the therapy…bills….!!! Why, OH Why didn’t I drink the family KoolAide when I was a kid..I would have been able to shun the Fords and Mopars and just be a normal one brand car guy??
There is some awesome stuff the Chevrolet Performance Team is put out, everything from small block crates to LSX monsters, to circle track crate engines.
Over the next few post I’m going to cover a few highlights and a couple unexpected – like engines for the Chevy Cobalt and some V6 engines. (Have just read some specs for the upcoming 2013 Mustang V6 – I want to see what Chevy’s got.)
In fact let’s start with something off the wall. Like the 900 V6 Intake for a 4 barrel carb!! What???!!!! It’s an aluminum high-performance for the 3.8 or 4.3 liter V6. So go ahead bolt on that 390 cfm carb..oh heck….grab that 600 cfm 4150 and drop it on top.
That is not a bad price. Of course it’s not for all heads, like it won’t fit the 3800 V6 or the 18 degree heads and you might have add a bump to your hood for clearance!!!
The engines for the 1973 Mustangs pretty well with the rest of the matched up the other models engines, but with some minor “tweaks”.
You couldn’t get a Mustang with a 4 cylinder (yet) but you could get with the standard 6. This was the 250 version, (250 cubic inches of displacement) the bore and stroke was 3.68 x 3.91 also used in the Torino. Topping it with a single barrel Motocraft carb and coupled with a compression ratio of 8.0:1 gave it a ground pounding horse power rating of 88 (Oh don’t worry, it gets worse in 1974).
302 remained the same for the Mustang and was the standard for the Mach 1. The 351’s (Cleveland and Windsor were available and they really remained the same as those for the other models.
Now you might be saying, ‘Well Tim, seems like you typed yourself in to a corner here. Those engines are the same.” But here is what made the differences – options!!!
With special intakes, valve springs, dampers, large 4300 D carbs, 2.5 inch diameter dual exhaust outlets and modified cam, you now talking increased breathing and exhaling capacity. Which we all know means…say it with me…..”MORE HORSE POWER!!!!!” But how much? I’m glad you asked.
The 351 with these types of option produced between 246 and 266 horse power. The 302 doesn’t show being configured with anything other than the stock options.
I just recently picked up a copy of GMs new Performance catalog and all I can say is WOW!! But we’ll dive into that in a future post.
Gracing the cover was the latest and greatest COPO Camaro. You remember those special order packages. Well they have brought it back and factory racing just jumped up and shouted “LET DO IT!!!!” [vodpod id=Video.15839761&w=425&h=350&fv=%26rel%3D0%26border%3D0%26]
