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Author Topic:   newer style blocks
dode
Member
posted December 26, 2002 09:37 AM
We bought an engine that is I believe the newer style setup. I haven't checked the casting numbers yet, but I know there are threaded bosses in the lifter valley, and it is stamped 5.7L. The threaded bosses are for the factory roller cam setup I would guess. My question is this. Can we run just standard hydraulic lifters in this block? Other than that is there any differences to look for? I am guessing that this is a newer style 4 bolt main truck block, but I am not 100% on that. Anything thing else I should be aware of? Thanks.

John

sideways
Member
posted December 26, 2002 10:27 AM
Never thought about the fuel pump...hmmm...that could be a problem. I will check on that. At any rate, it is fresh from the machine shop with speedpro rings, keith black pistons, stock rods with milodon bolts, clevite bearings, etc. It seems to be a good motor from a very reputable shop. I got it for pretty cheap, so I am not too worried. We have to run a stock mechanical fuel pump, so that is an issue I hadn't thought of. I do know it takes a different flywheel. We need a new one anyway. If the spot for the fuel pump isn't machined, is there any way to go back and do this? Thanks!!

John

racer17j
Member
posted December 26, 2002 05:39 PM
as far as i know there is no way of putting on a manual pump other than doing alot of machine work to the block but i could be wrong i supose you could try to get away with a belt driven pump like the mod guys use also another thing you want to look at is if it has a 1 or 2 piece rear main seal it cost about twice as much for a 1 piece crank than the older style 2 piece do if you ever have any problems with it and your not going to be able to find them as ez in a junk yard as the old ones either still not enough of them to piece a motor out they always want to sell the whole thing complete


superdave
Member
posted December 27, 2002 02:37 PM
Not to mention your flywheel won't fit the newer crank.


dode
Member
posted December 27, 2002 02:45 PM
don't have a flywheel yet, so that isn't a problem. Thanks for mentioning it though.

John

rico 08
Member
posted December 27, 2002 04:34 PM
i think the lifters are taller and if you run the shorter regular style they may not line up right with the oil galley,i beleive gm did this to save money and cast only one type of block for roller type& flat tappet motors,you're block can be machined using a jig for around 90.00 i'm told,throttle body engines should have a blockoff plate for fuel pump,just remove that and bolt one up,but most vortec motors have to be machined(i beleive 96'year blocks have the plate and 97 on up are blank.


dode
Member
posted December 27, 2002 04:39 PM
hmmm...anyone have any insight into this? this could definitely be a problem. I would hate to have to machine more on this as it is already assembled. That would be bad. I have to run a hydraulic lifter cam, so that has to be taken into account.

John

dode
Member
posted December 28, 2002 12:51 PM
Ok...the block we have is casting number 14093638. Mortec says it is from 87-95. It DOES have the fuel pump provision, so there is no issue there. Mortec lists it as roller or flat tappet cams. I can run hydraulic lifters in this correct? I have located a lightweight flywheel and clutch for the new style, so life is good there. Thanks.

John

sideways
Member
posted December 28, 2002 07:56 PM
I took one and just pulled the cam and lifters and installed hydraulic never had a problem ran all season.


rico 08
Member
posted December 30, 2002 03:45 PM
the one i had was an 89' model and i threw away the original cam & lifters,should have kept it but i thought the lifters we're taller than normal,the roller lifters are really tall it seems logical the lifter bore area would be higher to compensate,anyone run into this?


One87Racing
Member
posted January 03, 2003 07:14 PM
We install a lot of the GM performance crate engines and most of them have the new style roller block with flat tappet cams. I have changed cams and lifters in these engines without any problems. You may check with your local GM dealer and see if the lifter is special, but i don't think it is.


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