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Old 04-29-2008, 05:02 PM
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302 Chevy Specs

Hi Everyone, I was wondering if anyone knew where I could find the factory hp and rpm specs for the 67-69 chevy 302. I showed my dad a video of one being dyno'd and he doesnt believe me that it was a stock engine. I tried to explain to him that it was a factory trans am racing engine, but he says that there is no way that a stock engine will go to 8500 rpm without floating the points. My dad knows a lot of stuff about cars and has a hard time admitting that he doesnt know about this, if you know of somewhere that I could prove that Im right it would be great, thanks in advance.

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Old 04-29-2008, 06:29 PM
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goggle 67 chevrolet camaro 302.
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Old 04-29-2008, 06:30 PM
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They did turn lots of RPM's with solid lifter cam.
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Old 04-29-2008, 06:50 PM
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Horsepower @ rpm: 290 @ 5800
Torque @ rpm: 290 @ 4200

Although GM underrated this motor and it probably made more like 350 hp, the cam used wouldn't have been efficient at up to 8,500 rpm's and it isn't likely that the single point ignition would have been good for more than about 7,000 rpm's, even with a stout spring.

Us old guys were there when it actually happened and are immune to revisionist history. Open your dad a cold beer.
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Old 04-29-2008, 08:36 PM
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A few were also 450HP http://mecumauction.com/auctions/lot...D=CH1007-60689

Shane
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Old 04-29-2008, 08:57 PM
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what we have now compared to then is a great difference. We all know the 302 chevy was a racing engine, and it put out more than what chevy said it did. Anyways, back in those days, the factory also held back more than what we were given, they had the funds and time to experiment with ignition systems while the average shade tree joes like us did not. they had something to hide then due to the horsepower wars. By the time the early 70's rolled around and the smog police like the EPA and the gov had stepped in, why hide anything when it can be used to gain sales? this is why the HEI was introduced, it did everything better than points did, and lasted so much longer, it was on vehicles as early as late 74, right at the dying end of the horsepower wars, how do we know a small cap version wasnt held back? we dont, we also dont know if GM had some kind of special version or anything else up there sleeve. I have heard of anti float points, but wasnt around early enough to experience them, I came around in the HEI age, and I still say to this day, the best place for points is the trash.
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Old 04-30-2008, 06:49 AM
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I'd have to go with tecni... we both were around when these really hit the street and tracks. I spent a lot of time on the Sun machine back then and it was a good project to get single points to run 7000+. You could do it for a short time but the rubbing block wore out pretty quickly. I made my own dual points conversions for years before the Z was around. I even made some dual point dual coil before you could get a good coil. When Accel and Mallory came around the home made stuff was shelved.

As for how fast the stock Z-28 302 was well with a 4.56 gear they were ok but even at $.30 per gallon they were real guzzlers. My BIL had one and I totally owned him with my 396 Chevelle SS. We even switched drivers and it still was not a match. Around the corners well it was tough to beat the Z but with the metalic brakes on the 396 a parking lot race was a lot of fun. there was as much smoke coming off the brakes as the tires . haha My BIL was not a driver and got the crap scared out of him when I took him for a ride in the 396. haha

The Z was a respectable road racer that it was designed for but not a match for the SS of the day on the drag strip.

We bought a crate Z 302 and ran it in our JR fuel dragster. It lived a short life on 80%. With new pistons and rods it was a pretty cheap motor that ran very well.
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Old 05-07-2008, 12:16 AM
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I don't think they were so much under-rated as they were under-revved at the time they were rated. 290hp at 5800rpm was most likely an honest number, but I strongly suspect the horsepower would have been a lot higher if they hadn't shut down the dyno at 5800.
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Old 05-07-2008, 02:23 AM
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I'm with Jim on this, talked to the guys at Westech dyno once about this. Chevy purposely shut it down at 5800 rpm because thats where it REALLY started to make it's power. It was good to 7200 rpm and 420 hp. Ford and AMC did the same thing with thier Trans Am engine program.

Also Bentwings, not to argue but I didn't think you could buy a crate DZ motor back then.........unless you knew somebody????
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Old 05-07-2008, 02:54 AM
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Sorry, we did, several short blocks. These were before the crate motor craze. Probably the first of the crate motors. They worked great in the JR. Fuel dragster as long as you stayed below 80% and didn't get too crazy with the mag and opened up the top ring gap. I can't remember exactly but I think we paid about 400-450 each. We took the stock cam out and put our roller cam in, did the rings, bolted the Mondellos on, Enderle injectors, Vertex mag and went racing.

We pounded the living daylights out of the pistons. You would not believe some of the things I did to pistons back them. Not the least was TIG welding them and using double top rings.

Stock pistons were harder to come by so we just used the TRW replacements. They worked about the same and were dirt cheap.
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Old 05-07-2008, 05:32 AM
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well youve hit my soft spot chevy 301-302's i love em!. i currently run one mine is a poormans 301 <283 bored .125> all the specs are in the newbie forum. i shift mine at 7500 with a plain jane solid flat tappet cam. i cant wait to get a solid roller. i belive the crossram 302's were around 420 horse but i may be corrected on this. and boy oh boy do they sound great when they are screamin!! whats great about these little motors is when the big blocks cant chase you down boy do they get mad. no disrespect to big block guys. if i had a 55 chevy gasser id have a t-rammed 427 for sure .........scooter
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Old 01-01-2011, 04:11 PM
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New age 302

I am currently assembling a new age 302 and intend on the following laundry list ..... I really want to see if I can get a sweet mix of fuel economy and performance in a 3400lb car on a shoestring.

89 genII roller block
Vortech 062 heads
L99 factory crank - Scat I 6.0
CC XFI 252 roller
0-deck with shaved 350 hyper pistons
TBI - start with 2bbl Vic JR or performer adapted

Do Vortech heads on a Gen II require different piston valve reliefs and or dome design to best accomodate their performance boosting ability?

I get what quench is but what is squish ... and does o-deck affect either negatively?
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Old 01-01-2011, 04:46 PM
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Quote:
Originally Posted by keithnh
I am currently assembling a new age 302 and intend on the following laundry list ..... I really want to see if I can get a sweet mix of fuel economy and performance in a 3400lb car on a shoestring.
89 genII roller block
Vortech 062 heads
L99 factory crank - Scat I 6.0
CC XFI 252 roller
0-deck with shaved 350 hyper pistons
TBI - start with 2bbl Vic JR or performer adapted
Do Vortech heads on a Gen II require different piston valve reliefs and or dome design to best accomodate their performance boosting ability?
I get what quench is but what is squish ... and does o-deck affect either negatively?
Gen II is an LT1, correct? I don't think the L31 heads will bolt right on and work. They were designed to work on a '96-'99 Gen I block (Vortec 5700 motor) that was in trucks and vans and will also bolt right up on any other Gen I block ('55-up).

I don't know about the squish/quench question. Never understood quench. Squish is the close-to-a-collision mating of the piston crown with the underside of the cylinder head with the piston at TDC. The closing up of this dimension as the piston comes up in the bore "squishes" air/fuel mixture out of the area, creating turbulence and blowing it over across the chamber toward the spark plug, homogenizing the mixture and eliminating dead areas that might not get lit off when the plug fires.

Under operating conditions, the clearance is all but used up by the crank bending a little, the rod stretching a little and the piston heating up and getting a little taller, so that a very close non-collision occurs each time the piston comes up in the bore.
On a small block Chevy, tightening up the squish to somewhere between 0.035" and 0.045" will go a long ways toward preventing detonation on pump gas. Experiments by David Vizard allowed him to use 0.026" before a kiss was encountered. I have no idea what components he used to do this, so don't try it until you do your own experimenting or call David and talk with him.

Last edited by techinspector1; 01-01-2011 at 04:53 PM.
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Old 01-01-2011, 06:28 PM
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Quote:
Originally Posted by Chevrolet4x4s
Yea, in someone's dreams. Chevy's tuned race engines might have come close but the stock 302 that was available in the Z-28 from the factory.... no way.

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Old 01-02-2011, 11:52 AM
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Im not a chevy afficianado yet so am not positive on nomenclature. I now think gen II is LTI starting in 1992 with reverse cooling. Gen I's were still being made maybe? My block is a 1989 pick-up block that I believe will be set up for or is roller cam. I figured that was a generational change but maybe not. I do believe vortec heads are a bolt-on to my block but you need the intake to match. I would not fool with trying to match an old-style. I will be fooling with a tbi adaptor to the vortec manifold I choose tho ... Not too many good reviews on tbi-vortec factory or edelbrock offering.

I believe quench is the sum of factors causing the fuel explosion to terminate quickly enough for the next cycle. In Pontiac heads it is mainly a wall in the combustion chamber that the flame front hits to stop it evenly I believe. I was going to be modifying some pistons for rotating assemblies with various BBC or SBC rods and after reading Jim Hand's book ssuggestion actually found someone who would cut in an angled down to wall in the piston top that would effectively "mate" with the wall in the chamber. (TRW has .125 to play with.) This is still on my board ... I have to get a couple runners done so I can play poncho.

I guess squish is the distance fom piston top to head, meaning closest flat area of the combustion chamber to closest piston top. I believe sbc has flat area like poncho behind quench wall and closer clearance squishes out that hiding area of mixture. I see that deck height rating for sbc is 9.025 which leaves the piston down bore between .030 and .050 ? I think poncho is 10.250 which leaves you at 0-deck. Is there a reason why chev and poncho would be different, one commonly zero decked and the other not? There is still a head gasket ... valves go deeper in one or the other?
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