Re: Z-28 1/4 Mile Times
 

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Camshaft, for one thing...

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That is it, there is no other advantage, if in fact it is an advantage.
The bigger cam would be required to support the higher revs a 302 would need to attain to produce the power required (vs. the 350.)
The lt-1 has screw in studs and guideplates ,smaller cam,
and more cubes.
The reason the factory rated the 302 at a lower RPM was to keep the advertised HP number down. You will note the Boss 302 is also rated at 290hp. Its a simple matter of deciding what advertised HP level needs to be, and pick the RPM point at which that happens and use it.
I do not believe the 302 has any "special" advantage over any other similarly equipped small block,other than perhaps a better rod stroke ratio, and had the engineers at GM been able to use a 327 or a 350 for that matter, I'm sure they would have.
The size choice was only to keep within the SCCA 5.0L limit at the time.
The LT-1 has it over the 302 owing to the cubic inch difference, and all if not more performance pieces.
The LT-1 was unfortunately saddled with a crappy retarded ignition from stock, and a leaner than optimal carb jetting, but a "super tuned" LT-1 is an engine to be reckoned with, and with a much better cam in any of the aftermarket grinds,(even keeping conservative) will show a pretty impressive HP and Torque.

Re: Z-28 1/4 Mile Times
 

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a "super tuned" LT-1 is an engine to be reckoned with, and will show a pretty impressive HP and Torque.

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https://www.yenko.net/ubbthreads/imag...iggthumpup.gif

Re: Z-28 1/4 Mile Times
 

Sam, I tried to send you a PM clean out your mail box. https://www.yenko.net/ubbthreads/imag...emlins/eek.gif

Re: Z-28 1/4 Mile Times
 

Im a pack rat, all deleted, try now..

Re: Z-28 1/4 Mile Times
 

my 72 camaro ss runs mid to high 12's with a 350sbc that engine was built using all 70's performance parts.here is what i've done to it :Engine : 350 sbc 425hp /490 ft lbs torque / 11.5:1 compression / ported-polished #462cyl heads 2.02-1.94 valves / GM #3927140 mechanical solid lifter cam257/269 dur. 493/512 lift 112 LSA 4200-7000rpm / pete jackson "noisy"gear drive / early 70's edelbrock TR1-X tunnel ram (2) 70's correctholley 600 vacuum secondary carbs / older mallory unilite mechanicaldistributor and accel super coil / baldwin motion valve covers / flex alite "green" fiberglass flex fan / hedman long tube headers w/ 3" pipeto flowmaster 1 chamber race mufflers terminated at the axle.Transmission: turbo 350 with shift kit and B&M 3000 stall converter.Rear axle: gm 10 bolt with 4.10 gears and welded up spider gears or"lincoln locker"i've had both the edelbrock TM-1 and edelbrock scorpion intakes on this motor with a older holley 850DP and have run high 12's https://www.yenko.net/ubbthreads/imag...ns/burnout.gif https://www.yenko.net/ubbthreads/imag...ins/3gears.gif

Re: Z-28 1/4 Mile Times
 

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Who wins the race between two stock Z's.....the '69 or '70 version?
Just curious.

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This type of race?

Re: Z-28 1/4 Mile Times
 

The 70 car if all is equal.

Re: Z-28 1/4 Mile Times
 

Street tires?, if you are using slicks you should be running alot faster than that with what you have...otherwise you may want to update your suspension..

Re: Z-28 1/4 Mile Times
 

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Street tires?, if you are using slicks you should be running alot faster than that with what you have...otherwise you may want to update your suspension..

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If things work out, I hope to take it back this Sep with drag radials, good tune-up and now have a full MSD ign system. I ran the car last year with the Radial T/A's.

Re: Z-28 1/4 Mile Times
 

ET and MPH will also be affected by how you stage the car...deeper = slower ET slower speed...shallow = faster ET and speed.[shallow = givesa rolling 'head start' before the clock starts]

Re: Z-28 1/4 Mile Times
 

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ET and MPH will also be affected by how you stage the car...deeper = slower ET slower speed...shallow = faster ET and speed.[shallow = givesa rolling 'head start' before the clock starts]

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https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif Huh? what do you mean a rolling start?

Re: Z-28 1/4 Mile Times
 

[ QUOTE ]
[ QUOTE ]
ET and MPH will also be affected by how you stage the car...deeper = slower ET slower speed...shallow = faster ET and speed.[shallow = givesa rolling 'head start' before the clock starts]

[/ QUOTE ] https://www.yenko.net/ubbthreads/imag...mlins/hmmm.gif Huh? what do you mean a rolling start?

[/ QUOTE ] as you stage in shallow your front wheels roll forward a foot before it trips the photocell and activates the timers. so you are actually getting a "rolling start" https://www.yenko.net/ubbthreads/imag...ins/3gears.gif

Re: Z-28 1/4 Mile Times
 

Intersting topic.
As an owner of both a '69 Z/28 (DZ302/M21/3.73 ratio) and a '70 1/2 RS Z/28 (LT-1/M21/3.73),I can state without a doubt that the '70 LT-1 would out-perform the 302 run in and run out.Like a previous poster mentioned,there is no excuse for cubic inches.
The LT-1 has gobs of power and more importantly torque down low and a well-tuned LT-1 will be on the cam and chomping at the bit at 3500rpm.We all know a 302 doesn't really start coming on the cam until 4 grand and then it's hold on until 7500-8000 or until she blows!
Love driving my '70...possibly the best all-around Z/28 ever made.But nothing I own puts a smile on my face like a quick spin behind the wheel of my '69...and that includes my '70 SS-454 LS-6 Chevelle.

Re: Z-28 1/4 Mile Times
 

I agree with you, try putting that LT-1 in your 69, thats the best ride you can get for pure fun https://www.yenko.net/ubbthreads/imag...iggthumpup.gif https://www.yenko.net/ubbthreads/imag...s/headbang.gif

Re: Z-28 1/4 Mile Times
 

Hey John, Where were you a week ago? I rest my case! https://www.yenko.net/ubbthreads/imag...ins/3gears.gif

Re: Z-28 1/4 Mile Times
 

Yeah,I know...I've been too busy with car stuff!
No doubt the early 2nd. gen cars are perhaps the most beautiful built (especially the RS cars)but how are you going to deny the '69 the status of "awesome" musclecar?
truly a beautiful bodystyle...one I cannot stop looking at.I could say the same thing about the '70-'72 Chevelle...no spoilers front or rear...but who needs 'em when it looks this good?

But that's a different subject altogether.

All I can say is I bought the '70 1/2 in 1979 while I was searching for a yellow '69 and no 20+ years later,I've come full-circle.

God love the '65-'72 Chevrolet musclecars!

I think I'll go grab a beer and go gaze at the '69 in the garage...check in with you guys later.

Re: Z-28 1/4 Mile Times
 

OK,I'm back for now while the wife is in the shower.

My '69 was originally a Frost Green car (code #59)and I know you purists will all argue that it should have remained that color but I just couldn't live with it.Green (and not a NICE green like Ralley Green)but drab olive green with green everything...carpet,console,headliner,steering column,etc...and I just couldn't live with that.I painted it 2003 Corvette Z06 Millenium Yellow (with Black stripes)and it looks just awesome.Completely new interior,glass,every nut & bolt,front to rear.Second car I've restored like this and I think it's my last.

Last weekend at the Monterey Historics,Jim Hall and all 7 Chaparral's came out of his museum in Texas and rans laps around Laguna Seca.It was a blast for any Chevy fan to get to experience these cars running,especially the 2J car which was the "vacuum" car that had a snowmobile motor that ran the suction system.That car would "suck" itself down towards the track and was just light years ahead of the competition during that time...I mean 2+ seconds quicker than the McClaren's!Four races after it debuted it was out-lawed and so ended Can-Am as it was known.

It was a great time and I got Jim to sign all my Can-Am & Trans-Am books.

Speaking of Trans-Am,I know Ken Epsman who owns the championship winning '69 Sunoco Camaro (he recently turned down an offer somewhat south of $750K for the car!)and he has recently had it restored the way it ran during the early part of the '69 season,when the car had Red interior and the infamous vinyl top.Kenny has three T-A cars ('70 Sam Posey "sublime" Challenger and a '71 Penske Javelin.He also drove his '76 Dekon Monza against the Porsche Turbo's and kicked some German a**!

Anyway as you can tell,I love ALL things Chevrolet.

Check in a little later...