280z4me2 Posted January 20, 2009 Share Posted January 20, 2009 I am building a 280z. I am a good while away from swapping in a v8 but I would curious about a few things. What would a 280z do in the 1/4 mile with a stock 350? Also, I was debating on a 302 swap. Mabey a 347 stroker kit for it. The 302 is almost 200lbs lighter then the SBC 350. Why did you guys go with the 350? Quote Link to comment Share on other sites More sharing options...
nine8transam Posted January 20, 2009 Share Posted January 20, 2009 most people go with a 350 because stock for stock it has more hp and i guess its cheaper to build a chevy to my understanding but my dad has a 280 with a basicly stock 350 and i wasnt impressed with the car but it depends on what you want to do with it he just drives it Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted January 20, 2009 Share Posted January 20, 2009 WHICH STOCK 350 SBC, what transmission, what rear gear, whats the car weigh,the 350 sbc was produced in many versions that run from about 170hp-375hp? Thats a bit like asking if the next girl off the next random bus, wearing a blue dress, is going to be over 5.6" tall? a few more bits of info would go along way towards getting a reasonable guess as to the answer. Many guys install a SBC because its got alot of tech SUPPORT and the bugs are mostly worked out for the swap, the results, depend a good deal on the power to weight ratio, the suspension and tires, and the drive train thats used. Quote Link to comment Share on other sites More sharing options...
280z4me2 Posted January 20, 2009 Author Share Posted January 20, 2009 So the 200lbs wouldnt be enough to make you go SBF? I have a friend that just ran a 13.8 on a stock 302 in a 3500lb car. With his 75 shot, he is at 12.4. One of these in a 2700lb car would probably break mid 12's on motor alone. Quote Link to comment Share on other sites More sharing options...
ZZZeee Posted January 20, 2009 Share Posted January 20, 2009 As others already alluded to it's easier and cheaper to go SBC. There are several bolt-on conversions on the market and basic SBC's are a dime a dozen plus performance parts abound for them in the used market. But to each his own. For a look at some nice Z-car porn check out blueovalz's 289 conversion. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted January 20, 2009 Share Posted January 20, 2009 So the 200lbs wouldnt be enough to make you go SBF? I have a friend that just ran a 13.8 on a stock 302 in a 3500lb car. With his 75 shot, he is at 12.4. One of these in a 2700lb car would probably break mid 12's on motor alone. Based on ET that 13.8 calculates to 263 rear wheel horsepower and the 12.4 calculates to 363 rear wheel horspower. I doubt that is stock 302 by any means as that would make that engine making about 300hp at the flywheel, which is almost 100hp over stock HO motor. Quote Link to comment Share on other sites More sharing options...
pparaska Posted January 20, 2009 Share Posted January 20, 2009 So the 200lbs wouldnt be enough to make you go SBF? I have a friend that just ran a 13.8 on a stock 302 in a 3500lb car. With his 75 shot, he is at 12.4. One of these in a 2700lb car would probably break mid 12's on motor alone. I didn't see where anyone mentioned 200lbs. It seems you're alluding to a 200lb difference between a 302 Ford SB and a SB Chevy engine. I'm saying I SERIOUSLY doubt such a number. Please cite some references. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted January 20, 2009 Share Posted January 20, 2009 http://www.team.net/sol/tech/engine.html http://www.jeepgod.net/enginewts.html http://www.performanceunlimited.com/documents/engineweights.html http://www.carnut.com/specs/engdim.html depending on WHICH config of each engine your refering too,the differance in weight can go from about 75 lbs to about 150 lbs Quote Link to comment Share on other sites More sharing options...
DavyZ Posted January 22, 2009 Share Posted January 22, 2009 So the 200lbs wouldnt be enough to make you go SBF? I have a friend that just ran a 13.8 on a stock 302 in a 3500lb car. With his 75 shot, he is at 12.4. One of these in a 2700lb car would probably break mid 12's on motor alone. I have driven both Ford 302 and Chevy 350 powered Z cars. The Ford was very well sorted out and beautiful, but no more impressive than the Chevys. Granted this is seat-of-the-pants testing, but I was happy I am going with the 350 Chevy as my power plant. I agree with Pete that 200 lbs is a bit of a stretch between the two engines. I'm unconvinced it's that much...it certainly doesn't feel like that in the handling area. Davy Quote Link to comment Share on other sites More sharing options...
HICKL Posted January 22, 2009 Share Posted January 22, 2009 To attempt to answer the original question, my original 350 was stock short of flat top pistons and a little bit of cam. 1/4 mile was high 13's with a 5 speed and street tires. Oh, and I went with Chevy because ford suck..... Just kidding, dollars per HP, chevy parts seem to be cheaper and more available. Jeff Quote Link to comment Share on other sites More sharing options...
ZZZeee Posted January 22, 2009 Share Posted January 22, 2009 Why buy a 347 stroker when you can have a 434 stroker at the same price or a 383 stroker for less? Or, to put it another way, why have a 302 when you can have a 400 at the same price or a 350 for less? Quote Link to comment Share on other sites More sharing options...
HICKL Posted January 22, 2009 Share Posted January 22, 2009 This is great...here comes the classic chevy vs ford debate. Quote Link to comment Share on other sites More sharing options...
ZZZeee Posted January 22, 2009 Share Posted January 22, 2009 Not "Ford vs. Chevy"... I LIKE Fords. It's a "CID vs. cost" thing. Heck, if cost was no object I might build a stroked 351... 400? Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted January 22, 2009 Share Posted January 22, 2009 I think mid to high 13's is about right on, which is pretty darn quick. There is no debate. It's all about preference. Quote Link to comment Share on other sites More sharing options...
Pyro Posted January 22, 2009 Share Posted January 22, 2009 stock 1978 350 with stock cam and exhaust manifolds (185hp/275 ftlbs) would run about a 14.5 at 95 mph in a Z. (as stated by the JTR V8 conversion manual). Add a mild cam and some block hugger headers and a better intake to run a high 13 at 100 mph. Run 10:1 cr, lopey cam, 750 holley, 3.90 gears, then expect high 12's at 110. Add some better heads and some full length headers and run low 12's or high 11's. Quote Link to comment Share on other sites More sharing options...
dr_hunt Posted January 22, 2009 Share Posted January 22, 2009 LOL, run 14:1's, roller cam, AFR 220 heads, run 9's. Quote Link to comment Share on other sites More sharing options...
280z4me2 Posted January 23, 2009 Author Share Posted January 23, 2009 How are the 350's carbureted? Im not very savy with wires so I may go with a carb setup if I go 350. a 302 would be EFI because I know someone to do the wiring. Quote Link to comment Share on other sites More sharing options...
GRUMPZ Posted January 24, 2009 Share Posted January 24, 2009 I ran a high 13 with a 1986 305 with a mild cam and carbed. Easy to work on and easy to swap;engine, trans,performance parts etc. 302,327,350,383,400,pg,th350,th400, t-5 etc.. so many easy combo's that traction should be your concern.Remember. KISS (keep it simple s....) Quote Link to comment Share on other sites More sharing options...
Corzette Posted January 24, 2009 Share Posted January 24, 2009 stock 1978 350 with stock cam and exhaust manifolds (185hp/275 ftlbs) would run about a 14.5 at 95 mph in a Z. (as stated by the JTR V8 conversion manual). Add a mild cam and some block hugger headers and a better intake to run a high 13 at 100 mph. Run 10:1 cr, lopey cam, 750 holley, 3.90 gears, then expect high 12's at 110. Add some better heads and some full length headers and run low 12's or high 11's. Pyro is about dead on. When I first bought my SBC Z it was almost stock..had an after market intake. It ran 14.3s at 97 I think. I changed the cam to pickup the torgue on the lower end and some block huggers and ran a 13.7 at about 99 or 100 MPH. Lastly I added AFR heads, changed cam and torque convertor, went from a 3310 holley to a 750 DP and ran 11.9/12.0s all day long at 110/112. Comp Cams 282 HR with AFR single plane intake. Huge difference. Heads and TRQ convertor made the biggest gains IMHO. T Quote Link to comment Share on other sites More sharing options...
deja Posted January 24, 2009 Share Posted January 24, 2009 I ran consistent 12.9s with a stock 120,000 mile LT1 in my 2905 pound 280Z. 4L60E automatic allowing the trans to shift itself. 3:54 open rear gear, only engine modes are cold air intake and shorty headers. Quote Link to comment Share on other sites More sharing options...
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