jef602

I just tore down my 74 L82 for a rebuild, my vin is for a L82.My engine builder says everything looks all orignal I have correct matching numbers on block pad. The heads are 333882 and date code work, they have the 1.64 and 2.02 valves but no screw in studs and no guide plates. Has anyone seen this before ?

thegazman

The only information I can find on 333882 heads is that Chevy produced them from 1970-80 with 1.94/1.50 valves.

7T1vette

Your heads could have been reworked some time in the past.

Easy Mike

The 882 heads were also used on L-48s.

Mike Ward

True- but not with the large valve diameters that the OP has found. I'd say his heads are correct and original but am not sure if the '74s came with guide plates or not. I think not.

thegazman

Chevy made a 333881 head 1974-75 with screw in studs and valve guides with 2.02/1.60 valves. Wouldn't this be the heads they put on an L-82.

377

I think those heads r on my 73 L-82 [333881] r they good power making heads. i would like to make 400hp with my motor

scottyp99

L82 heads should have 2.02 intake and 1.60 exhaust valves, and screw-in rocker studs, shouldn't they?


Scott

jordan89

My '74 L82 Vette has the screw in studs, 2.02/1.6 Valves, and it's the original engine and everything.

LS4 PILOT

Al Colvin's CbtN identifies that some 74 L82 882 castings were built/machined as the early 881's , with the 2.02 valve and screw in studs/guides. I have bone stock 74 Z 14Kmiles, very late production car, 882 heads cast late june, with 2.02 valves and w/Hi speed valve train these also still had the good heavy castings the machine shop told me, I had them overhauled last year.. ,. Matter fact from my observations the 882 /big valves and high speed valve train show up most of the time on cars built after the first of the year more time than not. I keep a eye on the Z28 engines for 74. Generally I see 881 show up in 1974 cars built in the fall of 1973

I would say you heads are L48 that have been been reworked, never seen a HI PER set ( out of an original 73-74 L-82/Z28) of cast 882 HEADS without the high speed valve train. I believe as AL Covin points out , they went to 882 castings for both applications of L-48/L-82 for the better part of 1974 , no reason to cast more 881's as a seperate item with tons of 882 blanks on the shelf already.

I recently found a set of DEC 74 cast 882's with all the goodies .

Solid LT1

Original heads would have guide plates and screw in studs. Your heads could be reworked or if your not too particular about originality, pitched in favor of heads that will net you 30-50HP increase. The late open chamber heads flow well but don't have great combustion chambers. Even a set of Vortecs would give you a decent boost in HP.

Mr 74

My 74 L82 was built in December 73. Now I am curious what version of heads are on the motor as my car is very original.

Where is the 6 digit number stamped on the heads? Can it be seen with the heads mounted on the engine?

Thanks

Dave

LS4 PILOT

The casting number and its casting date are found on top the head under the valve cover , you can't miss em. They were cast into the head ( raised digits , not stamped)