67 427 oiling questions

[Keith B.]

hello on my fathers 67 427 with a may casting of the 351 block, the rear journal of the cam and the original cam barrings have the grove like the 65-66 BBs. the original distrbutor with the semi circle grove. it was my understanding only the 65-66 BBs had all this. there is a casting number or part number stamped into the cam of 3883044. this came out of a 427/390

[John H.]

Re: 67 427 oiling questions

hello on my fathers 67 427 with a may casting of the 351 block, the rear journal of the cam and the original cam barrings have the grove like the 65-66 BBs. the original distrbutor with the semi circle grove. it was my understanding only the 65-66 BBs had all this. there is a casting number or part number stamped into the cam of 3883044. this came out of a 427/390

Keith -

I think you'll find that the cam casting number is 3883944, which was the one-year-only '66 390hp cam with the groove in the rear journal. Can't imagine why a 351 block would have a 3-hole internally-grooved rear cam bearing in it - does the rear cam bearing bore in the block have a groove machined in it?

[Keith B.]

Re: 67 427 oiling questions

yes the rear cam bore in the block has a grove in it.

[Clem Z.]

Re: 67 427 oiling questions

i have seen later crate engines with grooved cam. GM must have wanted to draw down their grooved cam inventories

[Keith B.]

Re: 67 427 oiling questions

the cam barrings are dated feb of 1967 with the grove in it.

also the pistons have GM number of 386967 on them I can't find that number im my parts book

[John H.]

Re: 67 427 oiling questions

yes the rear cam bore in the block has a grove in it.

Keith -

Then the 351 block is machined as expected, for the '67-up one-hole non-grooved rear cam bearing; but it has the earlier 3-hole grooved bearing in it and the grooved '66 cam? Weird...

[Duke W.]

Re: 67 427 oiling questions

The number on the pistons may either be the casting number or the finish machined number.

Service pistons were only sold with pins, so the part number of the service assembly of piston and pin is what you buy OTC.

The same applies to camshafts. The molded part number is the finished part number of the camshaft, but service camshafts were only sold as an assembly of finished camshaft and indexing pin, which had a different part number, often sequential with the finished camshaft part number, but not always.

The Chevrolet drawings corresponding to the service camshaft part number is just a simple side view assembly drawing of the pin and front of the camshaft. All the detailed dimensions for the camshaft, including the as cast dimensions, are on the drawing number molded into the core.

Duke

[Keith B.]

Re: 67 427 oiling questions

Yes it's weired and I am confused. Hoping someone on here has seem something like this before

[Joe L.]

Re: 67 427 oiling questions

Yes it's weired and I am confused. Hoping someone on here has seem something like this before

Keith-----



Where are the numbers on the camshaft? Are they raised numbers between the lobes or are they stamped on the end of the cam?

[Clem Z.]

Re: 67 427 oiling questions

with a grooved cam and grooved block you should have had plenty of oil to the valve train plus a big internal oil leak around the rear cam bearing. like i posted before i have seen grooved cams come out of newer L-88 short blocks and over the counter engines bought for race cars. was this engine ever apart before you got it as some shop could have installed the wrong parts??

[Keith B.]

Re: 67 427 oiling questions

Joe the numbers were stamped on the end

[Joe L.]

Re: 67 427 oiling questions

Joe the numbers were stamped on the end

Keith-----


Generally, numbers stamped on the end indicate a SERVICE camshaft manufactured from a generic core. Are there any raised characters between the lobes?

[Keith B.]

Re: 67 427 oiling questions

Joe the only numbers I could find in between the lobes are 4364 and GM 27

[Wayne M.]

Re: 67 427 oiling questions

with a grooved cam and grooved block you should have had plenty of oil to the valve train plus a big internal oil leak around the rear cam bearing. like i posted before i have seen grooved cams come out of newer L-88 short blocks and over the counter engines bought for race cars. was this engine ever apart before you got it as some shop could have installed the wrong parts??

Clem -- here's an NOS eBay cam described as L88, with grooved rear journal, and part # 3994094. This number is way newer than the parts books I have -- must be post 1970. Listing also shows some good shots of stampings on the ends.

http://cgi.ebay.com/ebaymotors/1967-68-69-Corvette-Can-Am-L88-ZL1-427-Camaro-COPO-L72-NOS-GM-Camshaft-/330619326089?pt=Motors_Car_Truck_Parts_Accessories&hash=item4cfa728e89

[Clem Z.]

Re: 67 427 oiling questions

Clem -- here's an NOS eBay cam described as L88, with grooved rear journal, and part # 3994094. This number is way newer than the parts books I have -- must be post 1970. Listing also shows some good shots of stampings on the ends.

http://cgi.ebay.com/ebaymotors/1967-...item4cfa728e89

the 094 cam i believe was for FI and tunnel ram applications. i never saw a BBC cam without being stamped on the rear cam bearing journal.