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View Full Version : are these the rockers were looking for?



cutlassburnin
09-11-2008, 12:42 AM
http://www.jegs.com/i/Comp%20Cams/249/1417-12/10002/-1

Let it first be said I dont know much about stud sizes and all that...but would these work?

bubblebob88
09-11-2008, 04:33 AM
http://www.eautoworks.com/product-Competition-Cams-281238/Oldsmobile-CUTLASS.htm

I put in 1993 Cutlass, hows these compare...

skalor
09-11-2008, 11:43 AM
Both of those are a 1.52 ratio so I would guess not. Here are the 1.8 ratio rockers for the 3800 SI...

http://www.zzperformance.com/grand_prix/products1.php?id=606&catid=104

cutlassburnin
09-11-2008, 11:44 AM
Which engine did the cutlass have? Those look about right for my car.

Jr's3800
09-11-2008, 07:15 PM
You still need to know weather or not you have the 3/8 Stud for the rockers.. Mine on the 3800 are 5/16" as I have a 95 3800 TPI... The 90-92 L27, 88-91 LN3 3800 and the 3300 should all be 3/8.... But make sure...

Also keep in mind the Australians are the ones that were racing the old 3800 engines... So they have the mods for them.. And the Yella Terra rockers were made for the L27 and LN3..

But as I have said before, the question is do you have enough room between the piston and the valve to run a 1.8 rocker making the valve lift about .460.... I believe you will, but I would like you to be sure of this.. These rockers should fit and work..

Its amazing the Love the older 3800's and 3300's didn't get as compared to the Series II and Series III Buick engines...

If I had a 3300 sitting here I would have already checked it for you guys..

SCREECH
09-12-2008, 07:47 AM
Neat - I just learned something. I read your post in the other thread, Jr, stating that you have the "small studs" in your 3800 because it's a '95 (or was it that I'd have the "large studs" because I had a '92, I forget - it's been minutes since I read it now) but I'm half asleep and didn't really know that there was such a change in the 3800 between '92 and '93. I know in around '93/'94 they added the EGR which isn't present on my engine, and went to the black ABS intake rather than the aluminum one that I've got. I didn't know there were other differences, internal differences, that were made. Are the rocker studs removable, thereby being interchangeable?

Jr's3800
09-12-2008, 05:37 PM
Neat - I just learned something. I read your post in the other thread, Jr, stating that you have the "small studs" in your 3800 because it's a '95 (or was it that I'd have the "large studs" because I had a '92, I forget - it's been minutes since I read it now) but I'm half asleep and didn't really know that there was such a change in the 3800 between '92 and '93. I know in around '93/'94 they added the EGR which isn't present on my engine, and went to the black ABS intake rather than the aluminum one that I've got. I didn't know there were other differences, internal differences, that were made. Are the rocker studs removable, thereby being interchangeable?

Screech, you have the Larger Threads in the heads for the rocker bolts, I have the Smaller Threads in the heads..

That change was made for the 1993 Models, all of them used the Smaller threaded bosses and studs... But only the L27 for 93 Used the Roller Pivot, the L67 used the regular pivot... On the upper intake that was also a change for the 1993 Model year, as well as GM adding the EGR to it..

Not sure about the stud interchangeability...

Zaloryan
10-28-2009, 08:21 PM
Sorry to ressurrect this old thread, but I've been doing some more research. All 3300s from 1989 to 1992 have a 3/8 inch stud. All 1993 3300s have a 5/16 inch stud.

Question: If the 3300 originally came with a 1.6 ratio solid rocker, would a 1.52 ratio roller rocker reduce performance? What would different ratios do?

Buick_powa
10-28-2009, 11:09 PM
Sorry to ressurrect this old thread, but I've been doing some more research. All 3300s from 1989 to 1992 have a 3/8 inch stud. All 1993 3300s have a 5/16 inch stud.

Question: If the 3300 originally came with a 1.6 ratio solid rocker, would a 1.52 ratio roller rocker reduce performance? What would different ratios do?

reduce performance, The higher the ratio is the higher the valve lift is gonna be. For example:

On the Series II L67, The highest rocker ratio i 1.95, stock is 1.7 i think. The increase can reach 25 hp.

Jr's3800
10-29-2009, 02:48 AM
The highest ratio rocker I know of for any 3800 is 1.9... Stock they are 1.6..

Yes you can use the 3/8 stud rockers..

Like stated 1.52 will effectively reduce you valve lift... 1.8 will raise it..

Zaloryan
10-29-2009, 03:35 AM
Are there any years that the 3800 Series I engines used a 3/8 inch stud? And, are there any particular brands of rockers that any prefers over another?

Jr's3800
10-29-2009, 04:07 AM
the 3/8 stud was used on the 88-92 3800 V6.. 93-95 3800 series I used the 5/16 stud...

we generally use the Yella Terra 1.8 roller rockers for a Series I 3800..
Not 100% sure but ZZP may have some for the 3/8 stud... you may want to contact them on that...

Intense-Racing may be able to get them as well..

Zaloryan
10-29-2009, 03:41 PM
Well, considering how the 1993 3300 used the exact same cylinder heads as the 1993 "C" 3800s (except the 3300 did NOT have a smog hole for an EGR), I can safely assume that the rockers from an 88-92 3800 will work for my 90 3300...right?

Jr's3800
10-29-2009, 07:48 PM
Yes

Buick_powa
10-29-2009, 10:59 PM
Well, considering how the 1993 3300 used the exact same cylinder heads as the 1993 "C" 3800s (except the 3300 did NOT have a smog hole for an EGR), I can safely assume that the rockers from an 88-92 3800 will work for my 90 3300...right?

OMG really?

http://intense-racing.com/Merchant2/merchant.mvc?Screen=PROD&Store_Code=IR&Product_Code=3800-YTRR-6659&Category_Code=HCV

so these nice thing will work on a '93 3300, what about the other years? not the same heads and all? Damn i'm looking at options to give a little more "boost" to my engine for the next season...

Jr's3800
10-29-2009, 11:04 PM
Those rockers will only fir the 93 3300, no other years...

Only 3800 Vin L engines they fit are 93-95 3800 Tuned Port Injection

They will fit no other Buick engines