SBC Gen 1 parts compatibility

Discussion in 'Blocks' started by Hap, May 15, 2017.

  1. Hap

    Hap New Member

    Have some questions regarding SBC Gen 1 parts compatibility.

    The short block is a 1988 350CID (5.7L) non-corvette with factory roller cam and center bolt valve covers; one piece main seal.
    The block ID number verifies it is a 350CID, cast between 1987-1995. Unfortunately the VIN tag on the head deck has been shaved off probably from decking the block.

    Apparently during these years, 350 engines for Corvette and maybe some model Camaro is completely different? Heads and intake from a 1988 Corvette engine will not work on the block I have because of the reverse water flow design.

    Also will earlier SBC model heads made for the 2 piece rear main style SBC block fit on this 1988 block?
     
  2. Grumpy

    Grumpy The Grumpy Grease Monkey Staff Member

    if you have a REVERSE FLOW BLOCK
    your very likely looking at an LT1/lt4 style engine

    pictures difference between lt1 and gen1 chevy block
    by Aron213 ยป Wed Apr 13, 2005 5:44 pm

    Ok, maybe some of you will now understand what angles and spacing I am talking about when I say you can and can not do somethings. I didnt have a set of Vortec 350 heads laying around so I used a set of 305 heads which doesnt use the same intake design(actually they are still swirl port junkers) but does use the same bolt pattern.

    Pic one, is a Lt1 head, notice that the bolt angle is not flush with the intake face.
    [​IMG]


    Now here is the same head next to a standard SBC head, notice the bolt angle as compared to the SBC gen 1 head, also notice the spacing is different between the two heads. LT1 head is on the left, SBC GEN1 head is on the right. Also notice there is no water jacket on the intake face of the LT1
    [​IMG]


    Here is a SBC GEN1 head next to the LT1 head..This is the deck surface, notice all the water jacket openings are different..SBC Gen1 head is on the left, LT1 on the right
    [​IMG]


    Now there two are for the vortec head, notice that the bolts are even more of an angle than the LT1, when you bolt this intake on, the bolts are facing straight down, also notice there are only 4 bolts per head on the intake, there isnt any bolt holes in the middle
    [​IMG]


    [​IMG]

    http://www.corvetteactioncenter.com/specs/c4/1996/lt1lt4.html


    [​IMG]


    [​IMG]

    [​IMG]

    [​IMG]

    the later GEN2 LT!/LT4 reverse coolant flow block (ABOVE) differs from the first gen SBC
    the LT1/LT4 second gen SBC engine was standard in the 1992-1996 corvette

    [​IMG]

    look carefully at the first gen SBC block below
    [​IMG]

    http://garage.grumpysperformance.co...ts-differences-useful-links.13141/#post-68540
     
    Last edited: May 16, 2017
  3. Hap

    Hap New Member

    Thanks Grumpy.
    Very useful information and links.
    Sorry I know very little about SBC Gen 1 engines made past 1975...

    My buddy sent this picture of the short block he DOES have. Block casting number 14093638 notes it is a 350CID from 1987-1995.
    The front block water passage holes looks like a regular Gen1 SBC with standard cooling, NOT reverse flow.
    (Ignore the double timing chain crank gear)

    Will heads like Edelbrock RPM 60999 or Dart Iron Eagle 10111112 work with this block?
    These heads are for Gen 1 SBC with standard water cooling.

    Thanks again for the advice! 1988 SBC Block.jpg
     
  4. Grumpy

    Grumpy The Grumpy Grease Monkey Staff Member

    yes the first gen sbc heads, will work on that block, but of course you'll want to match the heads you select,
    to the intended rpm/power range and application and match the cam timing, compression ratio, and drive train gearing, etc.
    so lets discus the current car/truck weight, transmission, tire size, rear gear ratio and what your intended goals and budget limitations are, as a start point.
    the last thing you'll want to do is select parts that may cripple or restrict the engine performance by mis-matching components or selecting parts on price alone, we all work on limited budgets,
    but its will pay big dividends in power produced too carefully select matched components
    and generally the biggest mistake is mis-matching heads, intake and cam combos or scrimping on the quality of the components used,
    a couple extra hours or even days spent in detailed of research may prove critical, in fact anything less than buying and reading through several books and reading a couple dozen links and all the sub-links is very likely to leave you missing valuable and critical info youll need later, and thats usually going to cost you wasted time and cash.
    the big mistake's most people make is in not selecting the correct cam, to match the displacement and compression and drive train gearing or selecting a restrictive cylinder head or intake that does not match the intended power range

    yes allthe linked info below looks over whelming but ,
    youll be amazed at the detailed info and,
    the mistakes you can avoid by reading carefully and asking detailed questions, thus saving money and time

    http://garage.grumpysperformance.com/index.php?threads/sellecting-cylinder-heads.796/

    http://garage.grumpysperformance.com/index.php?threads/semi-fool-proof-cam-sellection.82/

    http://garage.grumpysperformance.com/index.php?threads/first-hotrod-build.12902/#post-67005

    http://garage.grumpysperformance.co...ing-a-383-sbc-combo-planing.12168/#post-58778

    http://garage.grumpysperformance.com/index.php?threads/bare-minimum-tools.11026/#post-48785

    http://garage.grumpysperformance.com/index.php?threads/matching-parts-and-a-logical-plan.7722/

    http://garage.grumpysperformance.com/index.php?threads/what-to-look-for-in-a-good-engine-combo.9930/

    http://garage.grumpysperformance.com/index.php?threads/another-383-build.12786/

    http://garage.grumpysperformance.com/index.php?threads/383-information-overload.11137/

    http://garage.grumpysperformance.com/index.php?threads/a-383-build.10991/

    http://garage.grumpysperformance.com/index.php?threads/impersonator.9600/

    http://garage.grumpysperformance.co...e-springs-and-setting-up-the-valve-train.181/

    http://garage.grumpysperformance.com/index.php?threads/port-speeds-and-area.333/

    http://garage.grumpysperformance.com/index.php?threads/valve-seat-angles-and-air-flow.8460/

    http://garage.grumpysperformance.com/index.php?threads/tbucket-engine-project-dart-shp.3814/
     
    Last edited: May 16, 2017

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