Z-28 1/4 Mile Times

[Mr70]

I have an out sourced Dyno true engine Test booklet on Chevrolet engines.
They also road tested these cars:

1969 Camaro 302/290HP 4V @ 5800RPM with 290 torque @ 4200RPM & 11/1 compression.
Car weighed 3340 LBS.
LBS./BHP is 11.5
0 to 60 in 7 seconds
1/4 mile 14.8 seconds

1970 Camaro LT-1 350/360HP 4V @ 6000RPM with 380 torque @ 4000RPM & 11/1 compression.
Car weighed 3580 LBS.
LBS./BHP is 9.9
0 to 60 in 6.5 seconds
1/4 mile 15.4 seconds

[Salvatore]

True HP for the 302 is around 350.(stock) My opinion is the LT-1 is about 380 or so. NHRA rates the 302 at 305HP for stock eliminator. Jerry MacNeish in E/S is about 459 on the dyno. Remember that is everything at almost perfect specs with a super tune.

[SamLBInj]

These are BS tests, who rev's a 302 to only 5,800? Engine isnt happy untill you hit 7,000
[ QUOTE ]
I have an out sourced Dyno true engine Test booklet on Chevrolet engines.
They also road tested these cars:

1969 Camaro 302/290HP 4V @ 5800RPM with 290 torque @ 4200RPM & 11/1 compression.
Car weighed 3340 LBS.
LBS./BHP is 11.5
0 to 60 in 7 seconds
1/4 mile 14.8 seconds

1970 Camaro LT-1 350/360HP 4V @ 6000RPM with 380 torque @ 4000RPM & 11/1 compression.
Car weighed 3580 LBS.
LBS./BHP is 9.9
0 to 60 in 6.5 seconds
1/4 mile 15.4 seconds

[/ QUOTE ]

[SamLBInj]

[ QUOTE ]
True HP for the 302 is around 350.(stock) My opinion is the LT-1 is about 380 or so. NHRA rates the 302 at 305HP for stock eliminator. Jerry MacNeish in E/S is about 459 on the dyno. Remember that is everything at almost perfect specs with a super tune.

[/ QUOTE ]
Alright, so there you have it a STOCK 302 (Whith factory headers I am guessing) is pushing 350 which is 60 more than rated, the STOCK LT-1 rated at 370 is only pushing 10 more?...The 302 should be the better motor but we all know its not and I believe the reason is that the 302 comes from the factory pretty much maxed out and the LT-1 has alot more to go, Just adding the off road cam, headers and air cleaner will probably add 40 to 50 hp..So what is this saying? If I put a 302 in my 70 Z/28 and an LT-1 in my 69 Z/28 which is faster? what is more important power to weight or horsepower per cubic inch?...we can look at torque next..

[Salvatore]

I believe the LT-1 on the street is faster. Remember NHRA is horsepower to weight. So the LT-1 would have to be a little heavier. Believe it or not, I never see any 1970 Z/28's running with the LT-1 at the drags. The killer engine in my opinion is the 350/255hp. I think NHRA rates them at 274hp (I think) They rate the 02 at 305. The cast iron intake, Q-jet and hydraulic cam doesn't effect the performance of the low hp 350 at the drags. Sam, If I had a 302 with a 3:73 gear and a 350/300 horse with a 4:10 gear both running good with headers,I think the 350 SS camaro may smoke the 02 camaro.

[SamLBInj]

[ QUOTE ]
I believe the LT-1 on the street is faster. Remember NHRA is horsepower to weight. So the LT-1 would have to be a little heavier. Believe it or not, I never see any 1970 Z/28's running with the LT-1 at the drags. The killer engine in my opinion is the 350/255hp. I think NHRA rates them at 274hp (I think) They rate the 02 at 305. The cast iron intake, Q-jet and hydraulic cam doesn't effect the performance of the low hp 350 at the drags. Sam, If I had a 302 with a 3:73 gear and a 350/300 horse with a 4:10 gear both running good with headers,I think the 350 SS camaro may smoke the 02 camaro.

[/ QUOTE ]
No way, that small of gearing will not make the difference in 50hp...

[Salvatore]

I don't know about that Sammy!

[SamLBInj]

Your telling me that an 69 SS 350 with 4.11 will whoop a 69 Z/28 with 3.73 I dont think so...

[Salvatore]

With me driving it will!

[Verne_Frantz]

Jeff,
The first MPH timer is 66' before the finish line, and the second is 66' after the line. (132' total, 1/10th of the 1320 quarter). The average MPH over that distance "hypothetically" occurs at the halfway point, or the finish line. Of course, depending on where the car is in it's rpm/horsepower band, the actual MPH at the finish line might be quite different than what the time slip says. After all, the car is accelerating.
Which, by the way, brings up a certain way to have a lower MPH on a quicker ET run. Just let off the gas as soon as you cross the finish line, a little before the final MPH light.

Verne