Identify Engine Help - SR84476

Asked by Sep 14, 2016 at 11:03 PM about the Pontiac Firebird

Question type: Shopping & Pricing

I am trying to identify the engine Horsepower/Torque of my newly acquired
1968 Firebird. Here is the information I have so far. 1. Has 3 Freeze plugs 2.
Has 350 casting 3. Has Service Replacement stamp of SR84476 4. Has
Transfer Lug by Distributor.

I can't get access to any date code without pulling parts off the car, so I
wanted to see if anyone can help me identify more information on my Bird.

Thanks!!

5 Answers

5,695

67-68 were transition years for GM V-8's. 326 to 350, 389 to 400. No other options unless you are running one of two in-line 6's. By your hood vent it is tagged as a 400 CID engine. However, previous owners could have changed the hood tag or the engine in the car is not the original. Sorry I could not assist anymore than this. Very nice 68 though!

Thanks Taver91.... yes, that car has been badged incorrectly by either the seller or the owner prior to that. The engine is a Service Replacement (see stamped number) and it is a 350. BUT there is a huge difference between a 1976 350 and a 1968 350 by about 150 horsepower! This is why I am looking for information on SR engines. How can you figure out how much HP and Torque I have without getting an expensive dyno or trying to find a date code that may or may not be on the block.

If it SETS you Slam Stuck in your seat its an Older Mobetta Motor " and if yet just Spinnin 1 wheels yet F+#:#"d

5,695

With so many variants of the 350 block out there, it will be almost impossible to determine what someone dropped into your car at some point in its life. Getting that info from a previous owner would be one way but without that, the dyno will be the best way to see what power you are generating. There are data codes on the rear side of the block though and maybe someone who knows their exact location could get to the stamping without pulling the engine. Good luck.

Taver91, I guess I am looking for someone who knows how to identify the casting numbers on a Service Replacement block though. Yes, there are multitudes of original Pontiac 350's but there are a limited number of SR engines, because they were just warranty replacements. That stamping should tell me something about the block, so are there any Pontiac experts on here that might know how to decode the SR numbers? Casey

Your Answer

Firebird

Looking for a Used Firebird in your area?

CarGurus has 692 nationwide Firebird listings starting at $3,911.

ZIP:
Get More Money for Your Car
Be seen by 20 million shoppers. Create Your Free Listing

Pontiac Firebird Experts

  • #1
    Samuel Moore
    Reputation
    1,010
  • #2
    dandyoun
    Reputation
    840
  • #3
    Tom Demyan
    Reputation
    760
View All

Related Models For Sale

Used Chevrolet Camaro
373 Great Deals out of 31,435 listings starting at $3,495
Used Chevrolet Corvette
114 Great Deals out of 16,225 listings starting at $3,995
Used Ford Mustang
344 Great Deals out of 41,949 listings starting at $1,488
Used Dodge Challenger
162 Great Deals out of 25,908 listings starting at $7,250
Used Pontiac GTO
3 Great Deals out of 392 listings starting at $3,950
Used Dodge Charger
326 Great Deals out of 36,250 listings starting at $1,999
Used Ford Mustang SVT Cobra
4 Great Deals out of 262 listings starting at $4,795
Used Pontiac G8
10 Great Deals out of 400 listings starting at $4,450
Used Dodge Viper
209 listings starting at $30,195
Used Chevrolet Silverado 1500
2,665 Great Deals out of 157,830 listings starting at $1,850
Used Ford F-150
2,997 Great Deals out of 230,656 listings starting at $1,300
Used Nissan 350Z
29 Great Deals out of 1,128 listings starting at $3,250
Used Jeep Wrangler
373 Great Deals out of 20,539 listings starting at $2,500
Used Cadillac CTS-V
3 Great Deals out of 567 listings starting at $9,950
Used GMC Sierra 1500
1,101 Great Deals out of 61,753 listings starting at $1,295

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.