Block casting numbers? What year
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Member
Joined: Jan 2013
Posts: 447
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From: Bryan, TX
Car: 91 Z28 camaro
Engine: L98 from 90-92 camaro
Transmission: 700r4
Block casting numbers? What year
Ok so i just finally got to a point at which i can see my casting number on the driver side rear of block and it said this gm 5.7L then it looked like it said a letter that looks like a G OR something similar, is the last letter to tell you the year it is, or what. Because i was told it is a 86 350 tpi from a iroc-z and then i looked it up and it said there were only 50 made and blah blah blah but i mainly would like to know which year i have, as i was told the 86 motors dont exsist anyways, thanx
Thread Starter
Member
Joined: Jan 2013
Posts: 447
Likes: 1
From: Bryan, TX
Car: 91 Z28 camaro
Engine: L98 from 90-92 camaro
Transmission: 700r4
Re: Block casting numbers? What year
No F-bodys ? Is that what you mean because I thought that there were a select few like maybe 50 that were used for testing but were never sold to the public rite? Anyways that doesnt help me find what im looking for so if anyone knows please help me
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Joined: Jan 2000
Posts: 20,981
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From: Mercedes Norte, Heredia, Costa Rica
Car: 1984 Z28 Hardtop
Engine: 383 Carb
Transmission: 4L60
Axle/Gears: 3.54 Dana 44
Re: Block casting numbers? What year
Yes, no 350s in any 1986 F-body that ever made it into public hands. Stories about test mules are largely irrelevant; car manufacturers do all kinds of things behind closed doors.
It doesn't answer the question of what year your block is, but there's nothing useful to be done with that information anyway. All you need to know is that it's a 1 piece RMS 350 block.
It doesn't answer the question of what year your block is, but there's nothing useful to be done with that information anyway. All you need to know is that it's a 1 piece RMS 350 block.
Thread Starter
Member
Joined: Jan 2013
Posts: 447
Likes: 1
From: Bryan, TX
Car: 91 Z28 camaro
Engine: L98 from 90-92 camaro
Transmission: 700r4
Re: Block casting numbers? What year
Yes, no 350s in any 1986 F-body that ever made it into public hands. Stories about test mules are largely irrelevant; car manufacturers do all kinds of things behind closed doors.
It doesn't answer the question of what year your block is, but there's nothing useful to be done with that information anyway. All you need to know is that it's a 1 piece RMS 350 block.
It doesn't answer the question of what year your block is, but there's nothing useful to be done with that information anyway. All you need to know is that it's a 1 piece RMS 350 block.
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Joined: Aug 2003
Posts: 1,644
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From: Long Island New York
Car: 89 Formula 350
Engine: Forged 385 H/C/I
Transmission: 700R4-4300 Stall-lockup
Axle/Gears: BW 9 Bolt 3:70
Re: Block casting numbers? What year
L98 HP ranged from 225-245 at the flywheel. The earlier L98s had slightly lower HP having 9.3:1 compression before moving up to 9.7:1 compression. 10 HP was just from the duel cats in the later cars so it looks like they only got a 10 HP gain from the added compression.
Thread Starter
Member
Joined: Jan 2013
Posts: 447
Likes: 1
From: Bryan, TX
Car: 91 Z28 camaro
Engine: L98 from 90-92 camaro
Transmission: 700r4
Re: Block casting numbers? What year
Oh well I guess its not that big of a deal wether its 30hp or 10hp i was just curious lol but im not going to keep waisting time asking about it lol unless it matters for anything like parts which i dont think it will, so thanx
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