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Old 11-25-2009, 11:33 PM   #1
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The Comaro Betrayed Chevy

The Ford Comaro Boss 302. Tell me what u think.
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Old 11-25-2009, 11:37 PM   #2
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Heres the pic.
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Old 11-26-2009, 12:30 AM   #3
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Am I missing something?
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Old 11-26-2009, 12:32 AM   #4
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Am I missing something?
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Old 11-26-2009, 12:34 AM   #5
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I don't get it. Gm made a 302 in the z/28 in that year. What are you saying, that some nut put a ford 302 in it?
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Old 11-26-2009, 12:39 AM   #6
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once i saw for sale a 68 camaro with a blown ford 460 in it.
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Old 11-26-2009, 12:39 AM   #7
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Huh???.................
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Old 11-26-2009, 12:40 AM   #8
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i think the car is powered by a ford engine... ?
maybe he's referring to that...


EDIT:
OP should have posted links, But this is what he's talking about.
http://www.hotrodhomepage.com/hrhp/2...owered-camaro/
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Old 11-26-2009, 12:40 AM   #9
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Is that why you intentionally mis-spelled Camaro?
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Old 11-26-2009, 12:43 AM   #10
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I smell spam.
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Old 11-26-2009, 12:46 AM   #11
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EXPLAIN THREAD
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Old 11-26-2009, 01:14 AM   #12
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I smell spam.
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Sorry to hear it dude. We allways have ham or turkey.

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Old 11-26-2009, 02:09 AM   #13
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Die thread, DIE!


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Old 11-26-2009, 03:19 AM   #14
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The Ford Comaro Boss 302. Tell me what u think.
Did you breath too much exhaust?
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Old 11-26-2009, 10:50 AM   #15
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I don't get it. Gm made a 302 in the z/28 in that year. What are you saying, that some nut put a ford 302 in it?
Really? I know they had a 307, but not a 302.
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Old 11-26-2009, 10:51 AM   #16
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Old 11-26-2009, 10:58 AM   #17
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nice..but don't care for the nerf bar exhaust.
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Old 11-26-2009, 11:05 AM   #18
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The 1967-69 Z/28 302 cubic inch small block V8

http://www.holisticpage.com/camaro/camaros/302.htm

In 1967, Chevrolet was busy promoting their new pony car, the Camaro, and part of the promotional efforts included racing the Camaro in the SCCA Trans-Am series. In order to make the Camaro competitive, Chevrolet introduced the Z/28 option package which included among other things, a special 302 cubic inch small block. The engine size was a result of the SCCA's 305 cubic inch displacement limit in the Trans-Am series at the time. The 302 turned out to be one of Chevrolet's finest small block offerings, and the engine stood in stark contrast to the ever increasing size of the big blocks used in the muscle cars of the day.
To arrive at the SCCA legal 302 cubic inches, Chevrolet used a 4.00" bore and a 3.00" stroke resulting in a very oversquare (the bore is larger than the stroke) combination. In overly simple terms and ignoring such important design factors such as bore / stroke ratio, an engine with a short stroke has the ability to rev higher due to slower piston speeds. As an example, think of two engines, A and R. Engine A has a stroke of 3.00", while engine B has a stroke of 4.00". If both engines are turning at a speed of 4000 rpm, the pistons of engine A have less distance to travel than those of engine B. Since both engines are turning at the same rpm, the pistons of engine R have to cover more distance in the same amount of time as the pistons of engine A, resulting in higher piston speeds. Short stroke engines, therefore, can run higher rpm with greater reliability and less stress on the reciprocating assembly. This is the approach Chevrolet took when designing the 302 for SCCA competition.
The blocks used in 1967 were casting number 3892657. These small journal blocks were also used for 327 and 350 cubic inch engines as well (all three engines used a 4.00" bore). 1968 models used block casting number 3914678 and featured the new style large journals. The 1968 block was also used for the 327/210 hp and 350 295 hp SS engines. The blocks used in 1969 featured thicker webbing around the mains and used nodular iron 4 bolt caps. A common misconception is that 1967 and 1968 302's were 4 bolt blocks, while actually the only engine to use 4 bolt main caps was the 1969 version.
The crankshafts used were forged steel, tufftrided pieces in all three years. 1967 models used a small journal crank with 2.000" rod journals and 2.299" main journals. 1968 and 1969 models used a large journal crank featuring 2.100" rod journals and 2.449" main journals. The forged cranks were deemed necessary due to the high rpm the 302s were expected to see.
The connecting rods varied considerably from year to year. 1967 models used what was the standard small journal rod of the time with a pressed in wrist pin and 5/16" rod bolts. Two styles of rods were used in 1968, the first being a strong large journal rod using a pressed pin and larger 3/8" rod bolts. Middle production 1968 rods were changed to a floating wrist pin design.

Both early and late style 1968 rods were shot peened (a stress relieving process) at the factory. 1969 engines continued to use the late 1968 style floating wrist pin rod.
All 302s used a special baffled oil pan (the baffles prevented the uncovering of the oil pump pickup as a result of the g-forces generated during acceleration, braking and cornering) and a high pressure oil pump.
All 1967 and early production 1968 302s used a pressed pin design forged aluminum piston with an 11.0: 1 compression ratio. Late 1968 production pistons switched to a floating pin design. The 1967 and early 1968 pistons used a dome design taken from the 327/350 hp engine, and featured two individual valve reliefs in the dome. Late 1968 piston design has a long notch-type valve relief cut across the entire dome. 1969 models featured a new 11.0:1 compression impact extruded piston with slipper skirts and a floating wrist pin. The dome design was the same as the late 1968 pistons.
Cylinder heads used on the 302s can be a bit confusing. In 1967, two different cylinder head castings were used on the 302, 3917291 and 3890462. Both heads used 2.02" intake and 1.60" exhaust valves. The confusion arises from the fact that the 3890462 casting was also produced using smaller 1.94" intake and 1.50" exhaust valves, although this head was never used on the 302. 1968 heads were also produced using casting number 3917291, but 1968 heads included a provision for a water temperature sensor not included on 1967 heads. Valve sizes were again 2.02" and 1.60" intake and exhaust respectively. To further complicate matters a small valve version of the 3917291 head using 1.94" and 1.50" intakes and exhausts was used on the SS 350 engines in 1968. So far that's two different versions of the 3890462 cylinder head and three versions of the 3917291 cylinder head! Both castings had the familiar "double hump" machined pad located on each end of the head. 1969 engines used head casting number 3927186 and featured the large 2.02" intake and 1.60" exhaust valves of the earlier heads. 1969 heads also have holes drilled and tapped in the ends due to a change in the alternator mounting method. All of the 302 cylinder heads, regardless of casting number, had the same characteristics. Large port volumes and large valves were used to facilitate breathing at high rpm, at the expense of low to midrange efficiency.
Fortunately, identifying the camshafts used in the 302s is much more straightforward than the identifying the cylinder heads. All three year model 302s used the famed solid lifter "30/30" camshaft, so named because of the .030" intake and .030" exhaust valve lash adjustments. This camshaft was also used in the 1964 and 1965 special high performance and fuel injected 327's installed in the Corvette. Again, due to the high rpm nature of the 302, a solid lifter camshaft was chosen. Solid (or mechanical) lifters require maintenance more often than hydraulic lifters, but are more reliable at high engine speeds than the hydraulic lifters. Hydraulic lifters tend to "pump-up" at higher rpm, which leads to valve float. This is not as much of a problem today due to the advances in valvetrain design, but was quite a concern in the mid-'60s. Specifications for the cam are .452" intake and .455" exhaust lift, 229 degrees intake duration and 237 degrees exhaust duration (both measured at .050" tappet lift) and 78 degrees of overlap (at 0 lift).
Chevrolet needed an appropriate intake manifold to take advantage of the other high performance engine pieces, and they settled on a single four barrel aluminum high rise design. The basic design of the manifold remained unchanged from 1967 to 1969 although two different casting numbers were used. 1967 and 1968 engines used casting number 3917610, and the intake featured the thermostat hole located off-center toward the drivers side of the car. The engine temperature sensor on 1967 models was located in a drilled and tapped hole next to the thermostat opening. On 1968 intakes, this hole is plugged due to the relocation of the sensor to the head. 1969 intakes, casting number 3932472, centered the thermostat hole and are otherwise unchanged from the earlier intake. As an over the counter option in 1969 (available through the parts department, never installed by the factory), the Z/28 buyer could order a dual four barrel aluminum cross ram intake manifold (casting number 3940077). This intake was designed so that longer intake runners and two carburetors could be used while fitting under the stock hood. In 1969, the intake came with a special ZL2 cowl induction hood and air cleaner. This intake performed poorly on the street, but when used on high rpm competition engines (the engine was designed for SCCA racing, after all) really came into it's element.
Holley 800 cfm dual-feed carburetors were used on all 302s, although list numbers differed somewhat on 1967 models. Cars built at the Norwood, Ohio assembly plant used list number 3910 carburetors only, while cars built at the Los Angeles plant used list number 3910 and list number 3911, the latter being used on cars equipped with an AIR (Air Injection Reactor) emissions system. California laws mandated that any new car sold within the state must be equipped with an emissions control system, thus the difference in carburetors.
All 1968 and 1969 302's used an AIR system thereby allowing the use of the same carburetor (list number 4053) regardless of assembly plant or car destination. The use of Holley carburetors on the 302's followed a Chevrolet tradition of using Holleys on their highperformance engines. In fact, the 4053 carburetor also saw duty on the 396/375 hp big blocks of 1968. Holleys are still used on the vast majority of carbureted competition engines and offer a high degree of adjustability, performance and reliability.
The exhaust manifolds used on 302s in 1967 and 1968 were little more than the standard "log" type found on most small block equipped passenger cars. The only major difference between years is non-AIR equipped 1967 versions have no provisions for smog tubes. Chevy must have felt that the majority of Z/28 owners would bolt on their own headers if so desired. In 1969, Chevrolet made available a tube header option for the 302 engine (when this option was ordered, the engine in the car came equipped with exhaust manifolds while the headers were shipped in the trunk of the car) along with a low restriction chambered exhaust system. The chambered exhaust was discontinued in May of 1969 due to problems with passing noise laws.
All 302s used a standard single point type distributor, although the advance curves were optimized for the needs of the 302.
What all of these various pieces added up to was a healthy small block rated very conservatively at 290 horsepower at 5800 rpm and 290 ft. lbs. of torque at 4200 rpm. Rumor has it, however, that the same engine produced 350 horsepower at 7000 rpm on the dynamometer! Why would Chevy underrate the engine? Certainly insurance reasons come to mind, along with the desire to understate what the engine was capable of lest the various racing sanctioning bodies penalize the teams that chose to run the Z/28 in competition.
Road tests of the day praised the engine that Chevy put together. While most testers found the lack of "bottom end" power a nuisance, the 302 more than made up for that shortcoming with a very strong top end rush. One tester likened the pull of the Z/28 in the upper rpm range as being similar to a 426 Hemi! That's high praise indeed for an engine with two-thirds the displacement. Quarter mile times were in the low to mid 14-second bracket, depending upon the conditions the test was performed under. Modified 302s used in Trans-Am racing generated in the neighborhood of 450 horsepower, which is an amazing amount of power from 302 cubic inches with enoughreliability to win SCCA championships in 1968 and 1969.
The 302 powered Z/28 was very successful in both NHRA drag racing and SCCA Trans-Am racing from 1967 to 1969. The Penske team with Mark Donahue dominated the Trans-Am series in 1968 and 1969 (winning manufacturer's championships for Chevrolet), while in 1968 Dave Strickler won the IHRA Super Stock world title in a 302 powered Z/28. That the engine and thus the car was so successful so soon after its release is a testament to the effort that went into the project by Chevy's engineers. It is, without a doubt, one of the all-time great small blocks produced by Chevrolet.
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Old 11-26-2009, 12:13 PM   #19
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Old 11-26-2009, 12:32 PM   #20
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Really? I know they had a 307, but not a 302.
It was only one of the most famous motors ever!
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Old 11-26-2009, 12:34 PM   #21
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The Chevy DZ302 whats this clown thinkin?
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Old 11-26-2009, 01:07 PM   #22
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This thread remind me of this

I kinda like some of it how it has allot of 2nd gen looks on a 3rd.



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Old 11-26-2009, 01:08 PM   #23
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:sm2:
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Old 11-26-2009, 01:09 PM   #24
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i edited my above post too, but i'll put in in a new post anyways. OP could have posted a link to save a lot of confusion...
http://www.hotrodhomepage.com/hrhp/2...owered-camaro/
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Old 11-26-2009, 01:34 PM   #25
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This thread remind me of this

I kinda like some of it how it has allot of 2nd gen looks on a 3rd.



thats so ugly. i do admit it looks interesting though. lol
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