350 small block chevy motor in 300zx?? - Nissan Forum
Z31 300ZX(T) 1984-1989 Zs - Engine and Chassis Discussion

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#1 Old Sep 20th, 2005, 04:17 PM
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350 small block chevy motor in 300zx??

Please note that I'm very much against this idea, but my boss and my co-worker keep trying to convince me that it would be cheaper and better(performance-wise) to throw a 350sbc into the 300zx that I have instead of refurbishing the turbo motor. As it is, I need to buy new lifters, new motor and transmission mounts, new gasket set, new brake lines(the rubber portions) new oil seals front and rear, new water pump, oil pump, and timing belts. I also need to pay for a valve job. What I need to know, is whether or not anyone has tried to put a small block into a 300zx before, and if so how much it would cost me, because I'm looking at an estimated $1,200 right now, and they keep telling me I could do the small block conversion for more like $1,000 and have twice the horsepower.

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#2 Old Sep 20th, 2005, 04:37 PM
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#3 Old Sep 20th, 2005, 04:51 PM
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If it was an NA Z31 I would say go for it, but if you already have a VG30ET I would just build it up.

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#4 Old Sep 20th, 2005, 06:04 PM
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The above car was a turbo before the motor blew. But the owner already had a SBC 240Z, so he also knew what he was doing. Note that he even kept the factory cruise control.

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#5 Old Sep 20th, 2005, 06:45 PM
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I have a 88 nissan pulsar that will have a 305 (not a type-o, i mean 305 cubic inch not 350ci) chevrolet engine, i will be installing my own transmission and drivetraign system, converting the entire are from a front wheel 5 spd system to a rear wheel 3 speed overdrive system. thankfully, i am not a new comer to chevrolets, i have owned a 79 camaro, a 65 impala sprt, a 88 chevrolet, and a cavalier beforehand (the cavy wasnt stock either )

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#6 Old Sep 20th, 2005, 07:11 PM
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Quote:
Originally Posted by LostLucian
I have a 88 nissan pulsar that will have a 305 (not a type-o, i mean 305 cubic inch not 350ci) chevrolet engine, i will be installing my own transmission and drivetraign system, converting the entire are from a front wheel 5 spd system to a rear wheel 3 speed overdrive system. thankfully, i am not a new comer to chevrolets, i have owned a 79 camaro, a 65 impala sprt, a 88 chevrolet, and a cavalier beforehand (the cavy wasnt stock either )

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for not being new to the chevy world, why in the world are you going with a 305 over a 350?? thats a total waste of money when you consider the 305 is such a weak contender compared to a 350. not only that, but what 3spd od system are YOU talking about? chevy's od tranny is a 4 spd, not a 3. im sorry, but you actually do sound kind of newbish to chevy's.
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#7 Old Sep 20th, 2005, 07:13 PM
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Originally Posted by ICP Sux0rZ!
i missed the day that this car was brought out to an az get-to-gether... i heard about it afterwards, would have been nice to see in person.
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#8 Old Sep 20th, 2005, 08:44 PM
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Quote:
Originally Posted by AsleepAltima
for not being new to the chevy world, why in the world are you going with a 305 over a 350?? thats a total waste of money when you consider the 305 is such a weak contender compared to a 350. not only that, but what 3spd od system are YOU talking about? chevy's od tranny is a 4 spd, not a 3. im sorry, but you actually do sound kind of newbish to chevy's.
Now I'm sure someone will correct me, but isn't the 305 the same size block as the 350?

From what I remember while studying engine options before I ended up not buying a K1500 a few years back, the 305 had the lower towing capacity of the V6 and worse fuel economy than the 350. It just didn't make any sense to choose the 305 over either.

And when was that car at an AZ show? Damnit. I would have loved to have seen it as well. All I know is he's from Houston.

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#9 Old Sep 20th, 2005, 09:54 PM
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Quote:
Originally Posted by AZ-ZBum
Now I'm sure someone will correct me, but isn't the 305 the same size block as the 350?

From what I remember while studying engine options before I ended up not buying a K1500 a few years back, the 305 had the lower towing capacity of the V6 and worse fuel economy than the 350. It just didn't make any sense to choose the 305 over either.

And when was that car at an AZ show? Damnit. I would have loved to have seen it as well. All I know is he's from Houston.
the 305 and the 350 externally are the same exact size. the 305 is less reliable, less economical and less powerful. for the extra 100 dollars or so, it doesnt make sense to go with the 305.
as for the z, if thats the same z my buddies told me about, it was at sco about a month ago. maybe its a different z, im not sure, but i know there was a vette powered z there.
funny seeing you here on nf, i thought you were primarily az240sx material.
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#10 Old Sep 20th, 2005, 10:53 PM
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ecternally they are not the same in some cases, and also,t he 350's belive it or not are just as reliable as the 305's the only differnce is that for more then 100bucks you pay to get a 4-bolt main block instead of a 2-bolt main block which are hard to come by anymore for original motors, and new ones cost a good mint. the 305 and 350 use differnt starters more often then not, the 350 version of the starter is more beefed up to turn the pistons, which measure 4 inchs as opposed to the 3.5 inch bores of the 305. i do own a 350 4-bolt main engine block, but i dont want to waste it on a nissan body, only for a real purpose built car, not a daily driver weekend car.
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#11 Old Sep 20th, 2005, 10:56 PM
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to skip to my bottem line, 305s are everywhere, and if wanted, the blocks can be heavily modified to fit the specs on the 350, and for those of you who dont know, the 305/350's share the same crank and what not, just the pistons differ, my 305 will inclue 350 heads, larger bores on the cylinders, lighter crank, and beefed up rods. why use the 305? quick frankly, i beat the shit out of my engines, and 305s are cheap to replace! lol (about $200 to $500 less for remanufactured block usually, and $50 less in a junkyard.)

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#12 Old Sep 20th, 2005, 11:14 PM
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305 and 350 are the same block. The bore is slightly different, is all. You can bore the 305 out to accept the 350 pistons and it works perfectly.

1st number is bore, 2nd is stroke

305 = 3.740" x 3.48"

350 = 4.000" x 3.48"

I'd take the 305, personally, because it'll rev quicker. The only difference between the 305 and the 350, is the 305 is low on torque, for the obvious reason. The 305 was only a bit short on the Hp from a 350. This comparing the 2 motors via the 89 IROC-Z, which I have experience with. The 350 only had 15 more Hp than the 305, but torque was alot higher. Easily cured with a supercharger, and the 305 has better throttle response. If you're looking at an LT1 or an LS1, then all bets are off, but if your swapping in one of the older TPI units, my bet is on the 305.

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#13 Old Sep 20th, 2005, 11:45 PM
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your right, think about it as a air/fuel ratio, the 350 bores allow the normal aspirated air to fit more air to as much fuel as the less airid mix in the 305 engine, however the supercharger or whatever combo of forced induction your pick solves this by shoving more air in less area, in this case, a 305 disposable engine with a supercharged carb set-up will use little amount of gas, produce more power then a normal 350. carburated versions are preferred however because its basic fact that carbs atomize fuel better then fuel injection however fuel injection is better for gas mileage. the lack of horsepower is explained by this, and the loss of torque is given here because the less bang the cylinder makes results in less torque to the drivetrain.

Last edited by LostLucian; Sep 20th, 2005 at 11:48 PM.
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#14 Old Sep 21st, 2005, 12:45 AM
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when it comes to the 305 vs 350 debate - NO ONE in their right mind would pick a 305 over the 350. the slight revability of the 305 over the 350 is not worth the tq loss or the hp difference of the 350. its too easy to find high hp 350's than it is to find a high hp 305, especially if youre looking at carb'd applications. 350's are not all 4 bolt mains either. the 375hp 350 in my truck is a 2 bolt. when i was shopping for an engine to go into my s15, i thought about a 305 but it just doesnt make sense when i could spend about a 100 dollars more and get that much more out of it.
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#15 Old Sep 21st, 2005, 03:55 AM
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Quote:
Originally Posted by AsleepAltima
when it comes to the 305 vs 350 debate - NO ONE in their right mind would pick a 305 over the 350. the slight revability of the 305 over the 350 is not worth the tq loss or the hp difference of the 350. its too easy to find high hp 350's than it is to find a high hp 305, especially if youre looking at carb'd applications. 350's are not all 4 bolt mains either. the 375hp 350 in my truck is a 2 bolt. when i was shopping for an engine to go into my s15, i thought about a 305 but it just doesnt make sense when i could spend about a 100 dollars more and get that much more out of it.
There is no revability benefit to a 305 over a 350. Both have the same rods and crank; the only difference being that the counterweights are drilled differently ofr the weight variation of the pistons between the two. Most 350's and all 305's are 2 bolt main engines, the 4 bolts are mostly found in the RPO codes LT-1 ( 1970-73), L48 ( 1967-70 350 4 bbl engine rated at 290-300 hp depending on application), L82 ( late 70's Corvette and Z-28 IIRC) and most truck applications. The 4 bolt main block 350 was only used in 1 application in the "2G" engines produced from 1980 (?) to 1986 and that was the L98 in the Corvette. (2G engines are made with a left rather than right hand dipstick, and have double drilled exhaust flanges on the ends of the heads). The 3rd gen engines are made from 1987( some late 1986) until 2000 or so and had the one piece rear main seal, centerbolt valvecovers, most had roller cams and the accompanying valley spider and cam thrust plate, and the bolt angle of the center 2 intake manifold bolts is slightly different than earlier engines. The biggest redesign came in 1992 with the addition of the LT1 ( notice it is not an LT-1). This came with the opti-spark distributor on the crank, timing chain driven water pump and reverse flow cooling. The only variation of this generation to have 4 bolt mains is the Corvette version, all others are 2 bolt. These came only in 265 and 350 CI displacements.
Other interesting trivia: The SBC did not have a oil filter boss until 1957 and earlier versions had a optional canister filter that mounted to the intake manifold! The SBC was the world's 2nd fuel injected engine in 1957 ( the 1954 Mercedes Gullwing was first and the first car with EFI was a 1958 Chrysler); Chevy II blocks had different oil filter bosses than standard SBC's, and all SBC's have the same mounting ears, so a 1997 Camaro LT1 350 ( last passenger car variant) will bolt right in to a 1955. The SBC was produced in production US cars from 1955 through at least 2000 with the fullsize Express vans getting it last. Displacements of the production SBC are as follows: 262.5, 265,267,283, 302,305,307, 327, 350 and 400 CI. The 302,327, 350 and 400 were the only ones available with 4 bolt mains. Sorry if I am a little off on any of this, but I was doing it from memory.

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