1968-1982 Specifications Guide Question

[Chuck R.]

In looking for casting numbers for a big block cast iron intake manifold, #3955287 I noticed that for 1970 this number was dedicated to an aluminum intake, and for 1971 this same casting number was used for a cast iron intake.

Is the 1970 casting code in error or was there actually an aluminum intake with the same casting number?

Just curious.

Chuck

[Robert C.]

Re: 1968-1982 Specifications Guide Question

287s are both Cast iron. The only alum. intake for big blocks was on the 71 LS-6.,& small block LT-1s

[Chuck R.]

Re: That's What I Figured

It's the ole typo deal.

Thanks Bob,

Chuck

[John H.]

Re: That's What I Figured

Same type of error exists in the '53-'62 Spec Guide for '62 intake manifolds - it shows the 3799349 as aluminum for '62 (incorrect) and as iron for '63 and '64 (correct). I passed the info on to Gary and Eric to note for the next printing.

[Joe L.]

Re: 1968-1982 Specifications Guide Question

Bob-----

Yes, the GM #3955287 was the cast iron big block manifold used for both 1970 and 1971 Corvettes with LS-5, as well as most other Chevrolet big block applications during that period.

As far as the 1970 and later period goes, the only aluminum manifold used on a big block was for the LS-6. However, 4 barrel manifolds used on all 68-69 Corvette big blocks were aluminum.

[Chuck R.]

Re: It must be aftermarket

Thanks for all the good info folk, too bad this master cylinder doesn't fit the mold so to speak.

Thanks again.

Chuck 32205

[Chuck R.]

Re: Thanks for clearing this up for me folks! *NM*