My car was a 305 from the factory, the guy i bought it from bought a 350 and put it in. How can i prove that it is a 350? What is the easiest way? Thanks I found a Jasper engine sticker on the bottom of the motor when i had it on a lift.

 

get the numbers of the pad on the block, in front of the right head and check it at www.mortec.com

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ICON Motorsports

1st & 3rd

 

So near the power steering pump?

 

no your other right, or the engines right, on the even numbered bank of cylinders. just find the joint where the head meets the block, on the fronf side of the engine, on the block is a little pad with numbers stamped on it, it most likely is painted over and covered in dirt.

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ICON Motorsports

1st & 3rd

 

look at the Balancer, If its hollow its prolly a 305, If its solid its prolly a 350


well, that is if noone monkied around w/ it



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60 Ranchero - Project ( Money Hole )
85 Sport Coupe LG4 - Daily Driver

Just another Hot Rod kid, or thats what they all tell me.
Livin' the Stereotype

 

I don't know about that balancer thing, because I am running a 350 balancer on my 305. And they both were the same.

But if it's carberated, there is a checker board, or like a grid type of a thing on the manifold. What I mean is that on the front left, (cars left) side of the manifold, there should be a grid in the casting.

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'82 Firebird, dead stock, 9 bolt disc rear, over 200,000 miles and still going strong, more to come...
http://www.spinfrenzy.com/stingerssx...easures.html#4

 

You can't use the balancer to check what the displacement is, all internally balanced SBC use the same balancer. An 8" balancer was used in Hi-Po SBCs. Some inexperinced people think that the balancer are different between 305 and 350, but that is not true at all. What they are seeing is a design change only. The intake webbing is also not a good way of checking for displacement. The webbing was added after a certain year (can't remember specific year) to all SBCs' intakes. The method ede mentioned is good, although it is used to find out what vehicle the engine was originally installed in (if it was even installed, aka crate engine). The only way to find out displacement is to pull the heads and oil pan and measure the crank throw and bore size. But if you want to know if it is a 4.00" bore block, look behind the driver's side head at the tranny mount flange area. There you will find a 7 digit number (which is the block part/casting number) which will tell you for sure if you have a 4.00" (or larger) block. Look it up at mortec or NastyZ28.com (which I prefer).

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George P. Lara
1984 "L69 A4"
Soon to be 357, T5, 3.70
1994 LT1 M6
SCCA, SCFB, SC3GFB

 

Do what George said... it's the most certain, unchangeable thing there is about a block. That number is the casting number, cast into the block when it is nothing but molten metal; the number on the right front contains more information, but can be changed by anyone with a number punch. You can't change a 305 casting into a 350, there isn;t enough metal, so if it's a 305 casting, it can't possibly be a 350. Bot sources George gave for casting # reference are very good.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Since any numbers or letters anywhere on the car can be changed, the only true way to tell is to pull your heads and measure the engine bore. If its 4.00" its a 350 (or a 327 or a 302), if its 3.76 its a 305. But I guess I would just trust the numbers, pulling the heads is a major chore.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

Can't change casting numbers... that is the one number that does not lie.

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"So many Mustangs, so little time..."
ICON Motorsports

 

i just bought a 350 block on the usa drivers side at the rear it says 5.7 ..presume that relates to 350 ..casting numbers never lie
one other test without ripping the heads off
is usually done at racetracks for class racing
is called a "bubble test" (in aus) is done by removing rockers and measuring displacement through the spark plug by turning motor over (have i lost you all yet ???????)

 

If you know somebody that can get your engine pumped at a track, they can tell you the displacement rather quickly.


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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

 

It'a a Jasper engine and they told me they put there own numbers on it. Near the power steering pump. I haven't had i chance to take it off and look but i know you can't see it without doing so.

 

Right.. those are the ones that anybody can change.

Look on the top of the bell housing flange, behind the driver's side head, and get the casting number. It's the only one that does not lie.

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"So many Mustangs, so little time..."
ICON Motorsports

 

Smash the gas and see how long it spins! If you really want to know isn't there a pump to measure this that the strips use to see if an engine is legal size for the class?

 

I have the same problem. I recently got my first car. It is an '83 Trans am. I know that it comes stock with a 305. The person that I bought it from said he replaced it with a 350. He did mention that it was a 350 4 bolt main, but im not sure if he was bull ****ting. I dont know how to check and see if it is truly a 350 4 bolt main. Isnt a 350 4 bolt main the same engine used in vettes? Please help me out, thanks.

 

Jim:

There's no way to tell which main caps the factory installed in the block. The same castings are used with both 2-bolt and 4-bolt caps.

First, find out if it's really a 350, by some one of the above mentioned methods; if it's still a 305, it sure as hell isn't a 4-bolt-main setup.

Next, put the V word out of your vocabulary as far as where the motor came from or anything else to do with whether it's superior in some way. A casting is a casting; no magical properties rub off or otherwise become imbued in it according to the curves of the sheet metal (or fiberglass) that it has been wrapped in at any given point in its life. In the case of the 350 4-bolt main block, it's also the same thing (same casting number, from the same mold, run through the same machines) that was used in dump trucks and school buses; who cares?

Knowing the claims people make when selling cars, I'd put the odds of that being sunshine pumped up your rectum as being around 90%. Any time someone invokes the magical mystical "V" word to romantically dazzle you into buying their used car, your BS alarm should jump directly to red alert.

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"So many Mustangs, so little time..."
ICON Motorsports

 

RB83L69:

Thanks. I dont really care if it came from a "vette" or not. Sorry that i used the "v" word again. It doesnt really matter to me. I was just wondering. Thanks for the help. I will let you know what type of engine it is, as soon as i find ou. Thanks.

 

That's OK, I'm just ragging on you because you obviously need it so bad! And of course, this is a Camaro/Bird board, not a Vette board, so some of us kind of get our inferiority complexes rubbed the wrong way by references to what the F*rd people call "the plastic pig".

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"So many Mustangs, so little time..."
ICON Motorsports

 

Well....im an f-body enthusiast. I would rather own an f-body over a vette any day. But i have to say that vettes have nice engines. I dont care what engine I have. But it would be nice to have a vette engine, and you cant deny you wouldnt mind having one either. My favorite car is a Firehawk, but i can admit the vettes are probably a lil faster.