454 Mechanical or hydraulic camshaft?

[Markus 38206]

[Clem Z.]

Re: 454 Mechanical or hydraulic camshaft?

i would say the cam is a 3863143 because of the lift and duration matches that cam and the casting number being 1 number off is typical.

[Duke W.]

Re: 454 Mechanical or hydraulic camshaft?

An easy way to confirm is to measure the height of the clearance ramps. They should have a height of about .014" off the base circle and be linear with a velocity of about .0002" per degree of crankshaft rotation, so they should consume about 70 degrees of crank rotation, or about 35 degees at the cam.

Duke

[John H.]

Re: 454 Mechanical or hydraulic camshaft?

My references show that all camshafts with the 4366 casting number were solid-lifter cams with .520" lift (P/N 3904362 for '67-'68 427/435 and '71 454/425), and the 3144 casting number used for a solid-lifter cam with .520" lift for '66 427/425 (P/N 3863143). Both castings should also have an "OMO" symbol cast-in adjacent to the casting number.

[Clem Z.]

cam part # vs cam casting #

go to http://www.camaro1stgeneration.com/c.../camcodes.html

[Markus 38206]

Re: 454 Mechanical or hydraulic camshaft?

Is it right that the 3863143 is a mechanical cam and has a duration of 242 for
both intake and exhaust? Where do you have the information from?

[Clem Z.]

Re: 454 Mechanical or hydraulic camshaft?

see my post below

[Markus 38206]

Re: 454 Mechanical or hydraulic camshaft?

I have seen that but there is the duration not the same at intake and exhaust as my cam has. Isn't it strange?

[Markus 38206]

[Clem Z.]

Re: 454 Mechanical or hydraulic camshaft?

those durations posted by chevy never make any sense but the 143 cam is 242 at .050 on both intake and exhaust.

[Craig S.]

Re: 454 Mechanical or hydraulic camshaft?

John- what is different in the 4362 and 3143 cams....everything I have ever seen shows the timing and lift the same, which is the case in Clems's website below. There must have been a reason they altered the casting and part numbers...both have the rear groove in the journal...thx!...Craig