Need engine specs for 89' 350.
Feb 11, 2012 | 04:23 PM
#1
Need engine specs for 89' 350.
I need any information I can get on the 350's that came in 89' Chevy trucks. Some questions I have.
Is it a O.E. roller?
Is it a one piece rear main?
Can I re-use the stock pistons?
What is the stock compression?
What is the stock Head gasket thickness?
Really just what ever I can get to do a rebuild.
Thanks.
Is it a O.E. roller?
Is it a one piece rear main?
Can I re-use the stock pistons?
What is the stock compression?
What is the stock Head gasket thickness?
Really just what ever I can get to do a rebuild.
Thanks.
Feb 11, 2012 | 06:11 PM
#2
I need any information I can get on the 350's that came in 89' Chevy trucks. Some questions I have.
Is it a O.E. roller? No. But the block may be provisioned for roller use. Pop the intake and see if the stand offs for the spider are in the lifter valley. Or even just look in the hole for the distributor.
Is it a one piece rear main? Yes
Can I re-use the stock pistons? I guess, depends how much cylinder work it needs for one.
What is the stock compression? 9.3:1 if it's from a light duty application ( 1/2 ton or light duty 3/4 ton.) If it has 193 casting heads probably the above compression is correct. 8600+ GVW trucks were lower, around 8.75:1.
What is the stock Head gasket thickness?
Not sure, I think around 0.039" but could be wrong.
Really just what ever I can get to do a rebuild.
Thanks.
Is it a O.E. roller? No. But the block may be provisioned for roller use. Pop the intake and see if the stand offs for the spider are in the lifter valley. Or even just look in the hole for the distributor.
Is it a one piece rear main? Yes
Can I re-use the stock pistons? I guess, depends how much cylinder work it needs for one.
What is the stock compression? 9.3:1 if it's from a light duty application ( 1/2 ton or light duty 3/4 ton.) If it has 193 casting heads probably the above compression is correct. 8600+ GVW trucks were lower, around 8.75:1.
What is the stock Head gasket thickness?
Not sure, I think around 0.039" but could be wrong.
Really just what ever I can get to do a rebuild.
Thanks.
Apr 9, 2012 | 05:24 AM
#3
Registered User
Joined: Apr 2012
Posts: 5
Likes: 0
Sounds really that you assemble your stuffs by yourself in your garage. I am highly impressed. Right now I don't have any answers regarding your queries but some tips may help you out. Firstly there are various communities of the vehicle enthusiast through which you may know about your solution. Secondly several motor corporations still run a part of their office as a backup office for the old vehicles. Some solutions can be gathered from there on. Thirdly you can try out various search engines for your problems. Hoping you get your solution soon.
Apr 15, 2012 | 08:12 AM
#5
Unless it's a 1 ton with 191 casting heads on it, compression ratio is 9.3:1.
No worse than any other 350 to start from, lol. In fact read the quote as it is accurate proven by the myriads of TBI boat anchors I have seen torn down....... Just like the OP of the quote below I had a 92 truck that I got new so yes the engine was original. It had zero provision for roller cam period, so then I started searching out as to why......
One thing- not ALL the '87-up blocks are provisioned for roller cams. I have a '92 truck 5.7L engine w/swirl port TBI heads and NO bosses for the spider, no machined lifter bosses, no cam retainer bosses, etc. Not just untapped- un-there! lol
The breakdown goes like this (be aware there are ALWAYS exceptions):
For 350 flat tappet blocks look for casting number 10054727, 14079287, 14088548, and 14101148.
For 350 roller tappet blocks look for casting numbers 10243880, 14011148, 14088526, and 14093638.
There are '87-up blocks that have the full provisions for a mechanical fuel pump, but they're relatively rare. Most often they're the earlier blocks and blocks that are equipped w/flat tappet cams.
Something to watch out for: There's a flat tappet block AND a roller block that both end with the numbers 148. 14101148 is a flat tappet block, 14011148 is a roller block.
About the quickest way to tell if you are looking at a roller engine in the junk yard, is to pull a valve cover and remove a push rod. Flat tappet p-rods are about 7.8”, roller p-rods are much shorter at 7.2” long.
AFAIK, there's no 'good' and 'not as good' blocks, other than 2- and 4-bolt mains.
Hope this helps!
The breakdown goes like this (be aware there are ALWAYS exceptions):
For 350 flat tappet blocks look for casting number 10054727, 14079287, 14088548, and 14101148.
For 350 roller tappet blocks look for casting numbers 10243880, 14011148, 14088526, and 14093638.
There are '87-up blocks that have the full provisions for a mechanical fuel pump, but they're relatively rare. Most often they're the earlier blocks and blocks that are equipped w/flat tappet cams.
Something to watch out for: There's a flat tappet block AND a roller block that both end with the numbers 148. 14101148 is a flat tappet block, 14011148 is a roller block.
About the quickest way to tell if you are looking at a roller engine in the junk yard, is to pull a valve cover and remove a push rod. Flat tappet p-rods are about 7.8”, roller p-rods are much shorter at 7.2” long.
AFAIK, there's no 'good' and 'not as good' blocks, other than 2- and 4-bolt mains.
Hope this helps!
Look this stuff up before you come back to try and tell me I am wrong........
Last edited by 1994Vmax; Apr 15, 2012 at 08:20 AM.
Apr 16, 2012 | 09:59 AM
#6
Staging Lane
Joined: Sep 2011
Posts: 71
Likes: 0
From: nj
im just going by past builds and what ive seen at the junkyard,no need to get all out of line.Ive never seen tbi350 in a truck from factory come ready for a roller cam.ive built up about 5 tbi motor 2 305's and 3 350's all where from years 88-93.they are out there just your real lucky to find them.
Apr 16, 2012 | 11:16 AM
#7
im just going by past builds and what ive seen at the junkyard,no need to get all out of line.Ive never seen tbi350 in a truck from factory come ready for a roller cam.ive built up about 5 tbi motor 2 305's and 3 350's all where from years 88-93.they are out there just your real lucky to find them.
As a core they are worth the price of scrap metal, nothing more.
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Apr 17, 2012 | 05:28 AM
#9
Staging Lane
Joined: Sep 2011
Posts: 71
Likes: 0
From: nj
well i never ran into a 638 casting block IIRC they used those blocks with TPI,TPI's were all roller blocks.in jersey i see alot of 727's,287's and 148's.638's and 880's are roller blocks because the zz3 crate engine uses the same block.
Apr 17, 2012 | 10:01 AM
#10
My 94 which had it's original engine as an example and was a 638 casting block. My 92 was the flat tappet only 148 block. No rhyme reason or otherwise, lol.
880 is all GM still uses now for 1 piece rear crates. ZZ4's, ZZ383's, HT383's, 350HO ( flat tappet cammed but still) and whatever else are all 880 blocks. Even some 1995 trucks had the 880 casting block with a flat tappet cam, 193 Heads and of course were TBI.......
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