Bought my car (71`GS 350) from the second owner after it had been standing in a garage for the last 13 years, put some new Cooper Cobra 235/70/14 on it, and raced it on a highway a few times when there was no traffic (nearly no option for drag racing on a strip on a regular base, maybe 2-3times a year around here). As far as known no tweaks whatsoever at all, no air, Posi 3.08, automatic. Warmed up the tires and hand-clocked it by myself: 15.4 to 15.6 sec. Clocked by my buddy (with a little torch as starting signal on the end of the track at night) 16.00 flat. 0-100km/h in about 7.4-7.6 sec.
I think you guys should bear in mind that the 17 second timeslip was done with the shifter in Drive, and on the street tires. They state in the article that shifting manually seemed to shave at least 1/2 a second off that time. Add some sticky tires, and the usual tricks, and that car should go high 14's, low 15's easy I would think. It weighed 3795 without driver.
ok I have no clue what my car would run but since i have what I was told a 1970 gs 350 that is suppose to be stock. It is a SP code motor and I haven't been in the hobby since i was like 19 until I bought this car last July. Could someone tell me what the "usual tricks" are? With the 4 speed in it I think it runs pretty strong after I got the air/fuel and timing close.
Full tune up. Power Time it http://www.v8buick.com/showthread.php?t=63475 Use Mickey Thompson ET Street Drag Radials at 18-20 psi. With a 4 speed, figure out your launch RPM so that it doesn't spin or bog.
It was not RWHP. In the United States, the term bhp fell into disuse in 1971-72, as automakers began to quote power in terms of SAE net horsepower in accord with SAE standard J1349. Like SAE gross and other brake horsepower protocols, SAE Net hp is measured at the engine's crankshaft, and so does not account for transmission losses. However, the SAE net hp testing protocol calls for standard production-type belt-driven accessories, air cleaner, emission controls, exhaust system, and other power-consuming accessories. This produces ratings in closer alignment with the power produced by the engine as it is actually configured and sold. With that said the 190 HP was closer to 150 at the tires. The 315 HP 1970 SBB was probably no more then 200 RWHP.
I ran high 15s with a stock 71 350/350 combo and 2.56 gears. Headers, MT radials only, and timing were the only mods.:laugh:
John, I understand the difference between gross & net HP, But if you look at Jeff's post he lists the car as having a measured 251 rear wheel hp. ("3800lbs 251RWHP"). I was wondering if that was accurate or a typo.
To go from 315 SAE grsss to todays SAE net rear wheel hp one would need to dedduct 20% roughly twice to get into the ball park. As stated above one would expect about 200 rwhp SAE net from a 1970 Buick 350 SP.
The car that Jeff Mann is refering to is a '72 350 which would be factory rated in NET hp. He also states that it dynoed at 251 RWHP which seems awfully high. I was just wondering if the 251 rwhp is a typo or if the car was not as stock as it was portrayed or ???. I assume, Jim, what you mean is that SAE net is ~20% less than SAE Gross & that Rear wheel HP is a further~ 20% less than SAE Net HP. I agree that these would be a rough "rule of thumb".
In my 70 GS's owners manual I remember seeing something like taxable hp (or something like that). I think the number was 48 hp. If my math is right that would make 268 hp. I'm assuming this was the more accurate number. I'll go through it later to refresh.
This is most likely true Rear Wheel HP, however not from a factory spec engine but rather a blueprinted rebuild using stock parts and a almost stock cam. There are 11 second Buick 350s with mostly stock parts: They even pull the front wheels, yes even the Q jet is used on these
Yea, Sean, thats what I'm thinking. This was not a "from the factory" engine, but a well massaged "stock engine". Jeff do you have any more details? Joe, how do you arrive at 268 hp, from 48 taxable hp?
