FIrst off, If you have a hold down plate then you have to have roller rockers. If you where to use the retaning plate with the lifter holder, the flat tapet lifters could not spin, and this would wear a cam out very fast. the only perpus for the plate is to keep the lifters straight so the roller would not twist and get off couse with the cam lobe.
NOw if the engine had the plate, but not the lifter holders, then some one has replaced the cam already and just put an older model cam in.
They do not make a flat tapet lifter with the narrowed sides for the lifter holders the plate holds down on the lifter.
What are you talking about ??? I am not concerned with the lifters or the flat vertical lifter guides that were used on hydraulic roller cam lifters in engines the were produced with a factory roller cam . And GM did not make a production truck engine that used "roller rockers" back then. I am concerned with the FACT that GM machined these engines ALL for retainer plates at the front of the block to "retain" the camshaft behind the cam gear of the timing chain gears.
This engine appears to have ( according to the vin engine code "K" ) a flat tappet cam installed BUT it also has the camshaft retainer plate on the front of the block as I have changed the timing chain and gears in it before.
SOoooo it either has a factory roller cam ,for which they were machined with the retainer plate for the camshaft and the vin engine code "K" is wrong OR it has benn machined to accept a factory roller cam with the retainer plate BUT had a flat tappet cam designed to fit in place of the factory roller cam ........which is it???
Here is a diagram of its location.
I need the casting number if you can get it for me. Thank you.
The block casting number is XXXXX which fits because this is a 350 number "from 1986 and up, 1 piece rear seal, some made in canada". Since I live in canada that makes sense. I need to know exactly what kind of camshaft is in this thing -the kind of timing chain and gears (for verification of the application ) .
I am not sure this is correct but the GM dealership says the factory cam PN# XXXXX But they couldn't tell me what kind of cam it was (flat tappet or roller) or any of the grind specs , all they said the listing in the computer said was "camshaft" and that was it. So that wasn't much help.
whats a tine?
well thanks for the tip . BUT I think the bigger question is why do you keep misreading my replies, go back and reread what I said . IT is NOT an 86 block The list "SAYS" that casting number is XXXXX blocks cast fro 1986 AND "UP" ( so 86-87-88-89-90-91-92-etc,etc) My block is a 1992 block and this casting number series covers my year.
Are you sure You have been a tech for 20+ years and own your own shop ? Or are you some punk teenager just f**king around with me.
I know you aren't here THAT IS WHY I HAVE GIVEN YOU THE CORRECT INFORMATION, YOU JUST SEEM TO MISS IT. Go back a couple of replies and you will see I was very specific and DID include the necessary information.
Look I DID NOT SAY IT WAS A FLAT TAPPET CAMMED ENGINE. Also I have stated this is a TRUCK and GM "DID" continue to use flat tappet cams in these engines up until 1995 that is what the VIN code "K" indicates -look it up.
THE PROBLEM IS THE APPLICATION "OVERLAP" THEY USED FLAT TAPPET CAMS & ROLLER CAMS BOTH IN THE YEARS 1988 TO 1995 IN BLOCKS MACHINED FOR THE CAMSHAFT RETAINER PLATE.
What I am trying to find out is WHICH IS IT.