is there any difference between a pontiac 455 sd and a 455?

Asked by Nov 14, 2013 at 09:41 PM about the 1973 Pontiac Firebird

Question type: General

what's the difference between engines? 455 sd verses 455

2 Answers

104,275

http://en.wikipedia.org/wiki/Pontiac_V8_engine -- check out the 455 portion of this link it should give you some insite into the differences.

104,275

In 1973, a further refined and even stronger version, the Super Duty (SD) engine was introduced with "only" 310 hp (231 kW)/231 kW (SAE Net) using a similar camshaft specifications to the Ram Air IV 400. The 455 SD used round-port cylinder-heads similar to those used on the 1971 and 1972 455 HO, with specific "LS2" intake and cast-iron exhaust header-manifolds. Still, it was the strongest American engine offered that year. Its power was achieved through bending of EPA emissions-testing procedures, which led engineers to de-tune the engine to 290 hp (220 kW) via a camshaft change to the same profile used in the early RA III 400 engines for mid-1973 and 1974, after which point it was discontinued. While an evolution of the RA IV and H.O. engine designs, the 455 SD was a much improved engine. In addition to the more refined cylinder heads, block casting reinforcements in the lifter galley and main bearing oil pan rail area along with the addition of forged connecting rods with larger 7⁄16-inch-diameter (11 mm) bolts, the SD was made with a provision for dry sump oiling from the factory. This truly was a racing engine, detuned for use in passenger cars.

Your Answer

Add photo

Related Questions

  • i WOULD LIKE TO KNOW IF THIS 71 PONTIAC IS EQUIPPED WITH A 455 ENGINE AND A 4 SPEED,THE V IN # IS 224871L109913. 2 answers

    1971 Pontiac Firebird

    -

    General

  • 1969 firebird 2 answers

    There are 3 different hoods for the 69 Firebird. The one I see the least has intake scoops close to the nose. This seems to be on a white 69 Firebird with blue stripes only. Is this a special mode...

    1969 Pontiac Firebird Coupe

    -

    General

  • location porblems 1 answer

    i have a 1972 firebird and i know i have a 455 but i cant tell if its from the factory or if its custom.

    1972 Pontiac Firebird

    -

    General

  • Storage Shed Find 36 answers

    Well I took over a storage shed, and found a prize waiting inside. Will post more pictures later when I can find my good camera. Wish I knew what engine this was. Have to go out with a flashlight a...

    1980 Pontiac Firebird

    -

    General

  • 68 Firebird engine space? 2 answers

    I have a 79TA that had an Olds 403 in it. Then came across 4 455 Olds motors that I couldn't pass up. Put the 455 in TA with no problem. I also have a 68 and I am just wondering if there is enough e...

    1968 Pontiac Firebird

    -

    Car Customization

Search Pontiac Firebird Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Pontiac Firebird Experts

#1 Samuel Moore
Samuel Moore
Reputation 920
#2 dandyoun
dandyoun
Reputation 780
#3 Justin Hatfield
Justin Hatfield
Reputation 730
View All

Related Models For Sale

Used Chevrolet Camaro
445 Great Deals out of 40,684 listings starting at $3,500
Used Ford Mustang
576 Great Deals out of 42,796 listings starting at $1,699
Used Chevrolet Corvette
288 Great Deals out of 20,545 listings starting at $3,688
Used Pontiac GTO
7 Great Deals out of 477 listings starting at $5,500
Used Dodge Charger
498 Great Deals out of 30,244 listings starting at $2,275
Used Dodge Challenger
341 Great Deals out of 25,161 listings starting at $7,988
Used Chevrolet Impala
936 Great Deals out of 35,377 listings starting at $1,700
Used Chevrolet Monte Carlo
19 Great Deals out of 1,684 listings starting at $2,900
Used Pontiac Grand Prix
25 Great Deals out of 3,701 listings starting at $879
Used Pontiac Grand Am
1,646 listings starting at $1,298

Used Cars For Sale

2002 Pontiac Firebird For Sale
8 Great Deals out of 131 listings starting at $5,888
2001 Pontiac Firebird For Sale
65 listings starting at $2,495
2000 Pontiac Firebird For Sale
4 Great Deals out of 77 listings starting at $5,995
1999 Pontiac Firebird For Sale
57 listings starting at $6,995
1998 Pontiac Firebird For Sale
51 listings starting at $4,500