Omarsvette

is there a difference between bbc and sbc air cleaner?

Tom73

Not in the snorkel part of the air cleaner, but the ring with the air seal is different since the carb is in a slightly different location.

gbvette62

The same air cleaner base is used for both small and big blocks, in 73 and 74. The adapter rings for the hood seal, are different for the two engines though. The base and ring used on 75's, is different than the 73-74's.

mardyn

I have an extra dual snorkel base if anybody needs one... make me an offer.

mardyn

Omarsvette

Can you tell if this is the correct bbc seal? Or would I have to get a new seal but use the same base

Omarsvette

I think the seal is the same just that a sbc needs a adapter ring since the motor sits lower.

LS4 PILOT

Has nothing to do with height ....it's the front to back alignment .....the rubber seal makes up for the height.....the RING alignes EACH engine to the correct center position on the bottom of the hood.

Well I can't get your pics to play . The only pic I see is facing the wrong way for me to tell ya.

There are three parts for BOTH engines....base , ring , and rubber seal .

The base and the rubber seal part are the same SB and BB.

Difference is in the RINGs . The INSIDE edge is where the diff is between the two rings .....the BB lip ring is offset on the inside , but still round on top.....this allows the 454 which sits different from the 350 to mate up with the air induction hood .....so there is just one hood for all cars. Cheaper to make two separate rings than two separate hoods.

You have to see the inside of the ring to see the difference. Look down on both .....and it's easy to see ....I can t tell from that one front view you show....the other five don't play

The BB ring is OFFSET inside ....the front is like 1 -2 inch wider at the inside flat edge facing toward the front of engine. The back inside lip is very narrow with maybe 3/8 " lip for the BB ring.

The SB inside ring lip surface is uniform 360 degrees . Inside and out
It's stupidity easy to tell once you see the BB ring. Not so easy to describe how to tell

LS4 BB ring is kinda rare . ......you might find somebody on eBay selling a BB ring with a base and they don't know what they got .....and get it cheap . But if a dealer gets one .....know what he has......then he'll sell it with a nice base and want 350-500 for the setup.

Omarsvette

I don't mean to doubt you. But I can't find any bbc ring part number in any catalog I.e. Dr rebuild or Ecklers. It seams only sbc had a ring. Again according to catalogs.

USA-OSC

They are yet to be repopped.

DonnieP73

If you look on page 269 of the 73 AIM, you will see that the
metal flange for the L48/L82 is part #330525;
LS4 is part #330527.

Donnie

Omarsvette

Ok I see it. Retailers don't make it. Ecklers says they sell the sbc in place of the BBC. Bout the only place is ebay and some guy want $800 which is ridiculous. That's just greedy. Zips says the replacement ring, which is sbc will do the job just as good. Which explains why it has not been reproduced. According to zip.

LS4 PILOT

Yup......that's because so few LS4 were made .........I was telling him .....the only way to get it reasonable is by seller not knowing the part on eBay.

I doubt they will tool up to make this part ......cost too much to sell a few .

Otherwise the dealers want big money for the ring .....and generally make you buy the whole deal

LS4 PILOT

Did you look in the assembly manual. Both part numbers are in there .

Many of the BB parts are not reproduced and when they are , they are wrong and of poor quality.

Omarsvette

i did look in the manual. the part number for a bbc ring has a replacement part that fits sbc on ecklers website.

its so hard being a pilot to an LS4

i guess ill have to use a sbc ring for a while.