Rabbitt

Has anyone ever build a SBC 302 for thier Thirdgen? I've always wanted to do it, wanted to know if anyone has.

BTW, for those of you who dont know, the 302 was only offered in the 67-69 Z28 Camaro. Thats the ONLY car and those are the ONLY years, period (with the exception of 70-70 1/2 because of the overrun production year). The 302 had the standard 327 (and 350) bore and putting a 283 crank in it. VERY high RPM motor (7500 rpm was the common shiftpoint).

I get my info from here
http://www.musclecarclub.com/musclec...istory-1.shtml

mw66nova

iTrader: (13)

your going to open up a serious can of worms with this thread. i say if your going to road race the car, then go for it, for drag racing i think that a 350/383/400 would be better. it can all be done with the right amount of money and r&d. but it's not the easiest way.

i do believe that it has been done though, i mean, a 302 in a thirdgen.

camaro-mayhem

yeah, basically you can get a 350 to perform better and rev higher then the 302 with todays technology.

ede

this out to get good. always fun to read what people who never saw one when they were on the streets have to say

camaro-mayhem

thank *** i wasnt there

Stekman

IMO, between the 302 and 350, it's all about cost vs. output.

But that's just me.

Rabbitt

meh, i was just curious if anyone on here has done it. I have never met anyone with a 302 in any car besides a 67-69 z/28, just thought it would be neat if i found someone with one, thats all. I would like to have one just because of that fact.

ede

the WOW factor won't win you near as many races and cubic inches will

TP355Z

Personally, I think a 302 would be awesome. Buuuut - I'd do it with a motor that would give you a strong basis to start with. Like an LT1 - that way you'd have good heads and a good induction system in the first place, then you could just go with a nice cam and make sure it breathes. I love the 302 chevy tho, just think of the fun telling a guy you beat him with a 5.0 chevy, and having him bewildered thinking it was a 305. Mwuhahahahahahha


Ty

Drakar

If you wanted to do a 302 motor setup; you could do the following.

LT1 - 350ci
L99 crank (3.00") (baby LT1 found in caprices)

combine with proper parts and create a 302 LT1 (was done with an LS1 and made 435hp - see SEMA 2000 ZL1? camaro)

this would let you take advantage of newer technologies, you could add a blower or turbo setup to it.

84H.O.Trans Am

iTrader: (1)

i have a 327 block you could make a 302...

five7kid

iTrader: (14)

Well, we haven't exactly "met", and I don't have it anymore, but I had one made from a 327 block and 283 crank in the '57. 12.5:1 forged pistons, 2.02/1.60 angle plug heads, solid lifter cam (heads and cam were the factory LT1 parts), Torker intake. Thing had absolutely no guts below 2500 RPMs, and with a stock 1200 stall Powerglide converter, was a complete dog off the line. But, if you could hold off the start of the race until 2500 RPMs, it would really kick.

The mild 396 in there now will run circles around it.

Chuck!

302s can be pleanty quick. My dad went 12.5 with full exhaust, 5.13 gears and slicks in the 70's at norwalk in his 69 Z28. His shift point was 7250 rpm, *** damn that sbc musta sounded great sreaming at that rpm.

ghettosmurf

Tell me where you can find one of those motors...for a decent price, ill be happy to take it off your hands for you!!!

f-crazy

iTrader: (-1)

That 302 LT1 would be pretty sweet, or a "old" 302 would be cool for road racing or drag racing...but like 57 just said it will pimped off the line, unless you had a M22 or a 3,600 convertor...

Chuck what was the MPH on that run...

my grandpa has a 68 Z with the DZ and rockcrusher with 4.10's..2nd owner and has been for almost 30 years pretty sweet car...

the only mods hes done to the original motor was stiffer valve springs and ran 12.8's@109

kevinc

Only 302 Chevy I've seen was in a 1st gen Camaro, just caught a glance at it as I blew past it on the road course at Memphis...two years in a row...

ljnowell

SImply because it is a 302, doesnt mean it is gonna be capable of 7500 RPM runs. Any motor can make those RPMs when built properly, and make much more power than the 302 doing it. Its definately a cool way to go if you dont mind getting smoked by the 350's.

ede

i can remember a few when i was in high school and other than the z/28 deal most people wanted a BBC in ss cars. like my wife likes to say bigger really is better.

mw66nova

iTrader: (13)

i'm surprised no one has posted about Preston's "305" with a single turbo. TPI383 has a huge photo gallery with Preston's car in it.

masseyiroc

i know a guy with a 302 in a 79 z28 drag car 300hp heads stock .490 solid lift cam 12:1 compression 5000stall 5.13 gears 29.5 tall tires converter,runs 12.5s@105 1.7 60ft 3000 pound car.revs high but i like my 400sb toqure better

Air_Adam

The '70 (or '70.5 if you want) only had the 350. No 302s were carried over from the '69.

I like the 302 just for the reason that its unique. And they can be scary fast... just look at the ones in the fox body Mustangs.

But this is the way I see it... the '69 302 and '70 LT-1 were built with all the same parts except the crank. Same heads, rods, intake, carb, exhaust, pistons, cam, etc etc...

The LT-1 was rated at 360hp and the Z28 was rated at 290. Both are said to be under-rated, but still. A 70 HP difference? You can't argue with that!

Rabbitt

rumor has it that the 302, when put on the dyno, would give up closer to 400hp.

five7kid

iTrader: (14)

I think he was referring to the LT-1 parts on my hybrid 302.

LT-1 heads were new and different than the 67-69 Z28 302 - angle spark plugs, 2.02/1.60 valves. Pistons were different because of the longer LT-1 stroke (pin height). '67 302 was small journal so the rods were different. I believe the LT-1 rods were different, anyway (more attention paid to detail). The LT-1 cam was also a new grind.

Doesn't really matter. Factory ratings were often low (and still are) to make sure each engine delivered made at least that much power, and to be more impressive when raced (sanctioning bodies pick up on that pretty quick), and to try to slide one under the insurance company radar. I've heard numbers as high as 475 HP for an out-of-the-crate 302. Dyno numbers can also be affected by how the test is run.

Air_Adam

The angle plug heads were not stock on the LT1. They were a factory ugrade part, but the cars were never put together at the factory with them.

The 302 and LT-1 used the same heads. The pistons were also had the same dome design (shoulda worded it better before).

The LJ 302 and the LT-1 both used pink rods. Best factory rods at the time. The LT-1 cam was the optional cam on the 302. That cam in the 302 was a dealer upgrade part, but it came with the LT-1 from GM.

five7kid

iTrader: (14)

At least the first year all LT-1's had the angle plug heads, from what I recall. They smogged the poor thing after that, not sure what heads it got before they finally let it die with what little dignity was left.

edgarbaker

i have a 327 short block and a 283 short block the 283 has a hole in one of the cylenders but the crank could be turned email if intersted:lala: