First Gen. Z28's horsepower - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

TheClassicCarKid · 03-21-2008, 09:49 PM

How much power did those 302's REALLY put out?

SSmoked · 03-21-2008, 10:11 PM

i rember talking to a guy at a car show with a z/28 with a 302 and he said 295hp with 295 torque.

smokn' · 03-21-2008, 10:17 PM

i've heard a lot higher numbers than that. try 400.

http://musclecars.howstuffworks.com/...camaro-z28.htm

Z27 · 03-21-2008, 10:57 PM

Quote:

Originally Posted by smokn'

i've heard a lot higher numbers than that. try 400.

That would be about right. All the stories floating around back then were talking 390-400HP. They needed 4:56 or 4:88 gears to really make a showing. They liked to rev.

COPO_Chevy · 03-22-2008, 11:27 PM

Quote:

Originally Posted by Z27

That would be about right. All the stories floating around back then were talking 390-400HP. They needed 4:56 or 4:88 gears to really make a showing. They liked to rev.

ya...iv heard up to 435 hp...and ya they really did like to rev, most people back then could go pretty fast in there Z's. However, most couldnt get that fast becuz they didnt shift at the rit points...these 302's liked to rev. high and be shifted at a higher rpm. Most people didnt want to rev there engine up to the 7x rpm (i believe it was that high anyway..if i can remember my research rit..)that was needed. The Z's were very nice cars expecially with the cross ram and the 2x4 barrel carbs that were optional at dealerships

CaptianSam · 04-02-2008, 01:04 PM

im telling my dad to stroke the 302 and polish and install a new tach but he wont... hes all about ORIGINAL...

DarrellJr · 05-26-2012, 05:40 AM

The 302 in³ (5.4 L) V8 engine was only available in first-generation Z-28s (the 350 LT-1 was used in 2nd generation Z-28s), and was created in response to a Trans Am racing engine displacement limitation at that time of 5 litres (305ci). The 302 was created by installing a short-stroke 283ci engine crankshaft in a 327ci block, resulting in 302ci. This just fit the Trans Am limitation (the bores of the actual racing engines were tweaked to produce exactly 305ci) and this design (with special modifications for high-performance use) resulted in an unusual, high-revving engine that helped create the legend of the Z-28. The 302 was the only engine available in the first-generation Z-28.

Z28 302ci/290HP V8 4BC - Z-28 only

referance:http://www.firstgencamaro.com/engines.html

flht99b · 05-26-2012, 06:11 AM

I had 2 - 1969 Z/28's, one with the original DZ 302's ( 4" bore, 3" stroke ) engine. That car also had factory optional 4.10 gears. The standard gear in the 1st gen Z/28 was 3.73 and I drove several with 3.73's and they weren't much fun to drive on the street. Chevy rated the '68 and '69 Z/28's at 290hp at the flywheel. In reality they were about 390hp and really didn't make any power until 4500 to 5000 rpm but would pull to just past 7000rpm. The 1970 LT-1 350 ( 4" bore, 3.48" stroke ) that was put in the '70 Z/28's and Corvettes was essentially the same engine as the '68 & '69 DZ 302 ( same heads, compression, cam, carb, intake manifold ) with 48 more cubes due to the longer stroke crank and had a ton more torque.
Ed M.

macalot · 05-29-2012, 08:48 PM

If I could only find a copy of my dyno results, I'd post it here. Needless to say at the rear wheels the dyno said 330 something HP. Stock motor with the original heads worked over and ported along with the intake. I installed 4.56 gears back in the mid '70s and have turned low 13's on regular ole street tires through the chambered exhaust. And the car is very consistent.
When running the car hard(which I don't do much anymore), 7,000 rpms is the shift point and I can tell you in 4th gear at 7 grand the engine is still pushing you back. The vast majority of races I've won over the years was on the last 300 feet of the 1/4 mile....the 302 doesn't know when to quit.

76z28 · 05-30-2012, 03:28 PM

Quote:

Originally Posted by DarrellJr

The 302 in³ (5.4 L) V8 engine was only available in first-generation Z-28s (the 350 LT-1 was used in 2nd generation Z-28s), and was created in response to a Trans Am racing engine displacement limitation at that time of 5 litres (305ci). The 302 was created by installing a short-stroke 283ci engine crankshaft in a 327ci block, resulting in 302ci. This just fit the Trans Am limitation (the bores of the actual racing engines were tweaked to produce exactly 305ci) and this design (with special modifications for high-performance use) resulted in an unusual, high-revving engine that helped create the legend of the Z-28. The 302 was the only engine available in the first-generation Z-28.

Z28 302ci/290HP V8 4BC - Z-28 only

referance:http://www.firstgencamaro.com/engines.html

302 in³=5.0L

03-21-2008, 10:11 PM	#2
SSmoked Drives: '12 Camaro ZL1 #1255 Join Date: Feb 2007 Location: O' Canada Posts: 1,283	i rember talking to a guy at a car show with a z/28 with a 302 and he said 295hp with 295 torque. __________________

03-21-2008, 10:17 PM	#3
smokn' Drives: 2006 GTO Join Date: Dec 2007 Location: Martinez, GA Posts: 228	i've heard a lot higher numbers than that. try 400. http://musclecars.howstuffworks.com/...camaro-z28.htm __________________ "Preach the gospel at all times--If necessary use words" - Francis of Assisi "To the honda owners: could of had a V8!"

04-02-2008, 01:04 PM	#6
CaptianSam Car Garage Drives: 350z,A4,SRT8...see sig Join Date: Feb 2008 Location: north west Posts: 823	im telling my dad to stroke the 302 and polish and install a new tach but he wont... hes all about ORIGINAL... __________________ 2012 2SS RS Ordered Black on Black 6 speed Coupe Artic Lid Stripes Yes I Supercharge Everything On My Ipad Xbox McLovin1515 Ps3 McLovin1555 Current Autos:68z28,03viperSRT10,04escalade,05RangeRoverSport SC Project Autos:80corvette350-500hp 6speed,06charger S'C 6-speed posi,74Firebird400blue,69chevelle572 707 New Autos:2012CamaroSSRS,09ChallengerSRT8 Past Autos:....too many to list "i told you it was gettin' an LS3" Go down deep enough into anything and you will find mathematics. Dean Schlicter B.Sc. Hons. Mathematics

05-26-2012, 06:11 AM	#8
flht99b Drives: 2010 Camaro 2SS/RS RJT Join Date: May 2009 Location: Knoxville Posts: 1,255 View My Garage	I had 2 - 1969 Z/28's, one with the original DZ 302's ( 4" bore, 3" stroke ) engine. That car also had factory optional 4.10 gears. The standard gear in the 1st gen Z/28 was 3.73 and I drove several with 3.73's and they weren't much fun to drive on the street. Chevy rated the '68 and '69 Z/28's at 290hp at the flywheel. In reality they were about 390hp and really didn't make any power until 4500 to 5000 rpm but would pull to just past 7000rpm. The 1970 LT-1 350 ( 4" bore, 3.48" stroke ) that was put in the '70 Z/28's and Corvettes was essentially the same engine as the '68 & '69 DZ 302 ( same heads, compression, cam, carb, intake manifold ) with 48 more cubes due to the longer stroke crank and had a ton more torque. Ed M. __________________ RJT 2SS/RS, AAM 3.70's, MTI Sway Bars, Shifter & SS brake lines, BMR Trailing & Toe Arms, full rear cradle & diff bushings, Pedders XA's, Camber/Toe eccentrics, Radius arm inserts, Hawk HPS Brake pads, GTO clutch reservoir, LS9 cam, Comp Cam valve springs, Melling 10296 oil pump, CR 5 timing chain, LS2 damper, CAI Cold Air Induction, ARH LT headers w/HF cats, GMPP touring axle back, Elite Engineering Catch Can, Forgeline 20x9 & 20x11 DS3 wheels with Pirelli Pzero 275/40/20 & 305/35/20 tires, '11 Convertible spoiler, Lloyd "SS" Floor Mats, GM Camaro Trunk Mat, GM SS Fender & LS3 Emblems.

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05-26-2012, 05:40 AM	#7
DarrellJr Drives: 68 camaro Join Date: May 2012 Location: detroit Posts: 6	The 302 in³ (5.4 L) V8 engine was only available in first-generation Z-28s (the 350 LT-1 was used in 2nd generation Z-28s), and was created in response to a Trans Am racing engine displacement limitation at that time of 5 litres (305ci). The 302 was created by installing a short-stroke 283ci engine crankshaft in a 327ci block, resulting in 302ci. This just fit the Trans Am limitation (the bores of the actual racing engines were tweaked to produce exactly 305ci) and this design (with special modifications for high-performance use) resulted in an unusual, high-revving engine that helped create the legend of the Z-28. The 302 was the only engine available in the first-generation Z-28. Z28 302ci/290HP V8 4BC - Z-28 only referance:http://www.firstgencamaro.com/engines.html

05-29-2012, 08:48 PM	#9
macalot Drives: 69 Z28 since '73 Join Date: Aug 2009 Location: Pittsburgh Area, Pa Posts: 47	If I could only find a copy of my dyno results, I'd post it here. Needless to say at the rear wheels the dyno said 330 something HP. Stock motor with the original heads worked over and ported along with the intake. I installed 4.56 gears back in the mid '70s and have turned low 13's on regular ole street tires through the chambered exhaust. And the car is very consistent. When running the car hard(which I don't do much anymore), 7,000 rpms is the shift point and I can tell you in 4th gear at 7 grand the engine is still pushing you back. The vast majority of races I've won over the years was on the last 300 feet of the 1/4 mile....the 302 doesn't know when to quit.