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2- bolt main cap

  
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2- bolt main cap

 
dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/12/13
10:10 AM

i just visited the mortec .com site, tried to help the lady trying to decode her ML prefix engine... no luck, but never been there before, so i take a look around. a guy is trying to decode the THH suffix, a fellow replies and uses reference to the block casting, its # is 3914678, and his response is the block casting is particular to... 1968 350, 2-bolt main, 1968 327, 2-bolt main, 1968 Z/28 302, 2-bolt main, RED FLAG, put on the brakes! 1967 Z-28 302, small journal 2-bolt main .... yes! 1968-1969 302 Z-28, large journal 4-BOLT MAIN BLOCK!!! period!  

joe- joe-
User | Posts: 133 | Joined: 11/11
Posted: 12/12/13
11:05 AM

Code Year CID Vehicle HP RPO Trans Carb Comments
THH 71 307 Truck 200 L-14 Manual 2-Brl C-20 & C-30, Motor home
THH 82 350 Truck 160 LT-9 Manual 4-Brl C-20 & C-30


chevymania is also a good site for info.
http://www.chevymania.com/  
joe-

joe- joe-
User | Posts: 133 | Joined: 11/11
Posted: 12/12/13
11:08 AM

3914678 302/327/350 68-79 210-350 car & Truck 2-bolt  
joe-

dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/12/13
12:03 PM

302 displacement is not a correct usage! non correct information... wanna buy my 2-bolt main L-88?, LS6? LT-1? oh let me guess no one misprinted info that says those engines used a 2-bolt block! looks like im screwed on my get rich quick scam, darn!!  

dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/12/13
12:28 PM

wink wink, hey joe, ya think that 350 horse 327 from 1968 is a 2-bolt main?  

76Skylark 76Skylark
Guru | Posts: 853 | Joined: 12/11
Posted: 12/12/13
01:13 PM

From what I remember 68 350hp 327 is a 4bolt but the 67 302 is a 2 bolt. I thought the 307 was GM dumping the Sm journal 327 crank in the 283 block to eleminate stock piles.1969 302 was 4 bolt.  

dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/12/13
01:36 PM

dude you said it all!! makes sense why a 68 302 has 2-bolt mains, right, wink wink.  

joe- joe-
User | Posts: 133 | Joined: 11/11
Posted: 12/12/13
01:36 PM

i honestly had only heard the 302 refferd to as the "DZ" block before. Confused


Code Year CID Vehicle HP RPO Trans Carb Comments
DZ 69 302 Camaro 290 Z-28 4-spd 4-Brl Holley, HP solid cam, A.I.R.  
joe-

76Skylark 76Skylark
Guru | Posts: 853 | Joined: 12/11
Posted: 12/12/13
02:07 PM

I think the DZ moniker is the RPO designation, it wasn't a special block, the small journal had the Green dot rods and the Large journal had the Pink dot,the Hi performance engines did get a Forged crank.and like tuff said all 283's were forged.  

dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/12/13
02:44 PM

nope nope nope.. late 283 crank is cast, as is 307. 1968 Z-28 engine code is MQ in cali with A.I.R. pump, the other states motor is the MO job. my pappy bought a 1968 Z-28 in 1970 off a used car lot for 1,500 bucks, blew the motor, bought a CTB code 1970 LT-1 from jacks corvette wrecking yard in norwalk cal. in 1971, cost 1,000 bucks had like 5,000 miles. pop wanted the L-88 he sold the day before!! yup 1 day late!! pop should have went 2-days earlier when he made the phone call! some ya win, some ya lose!!  now that im over 50 and think about it, that would have been a crazy super rare combo, 1968 Z-28 filled with 1968 L-88 rat! my youngest brother still has dads car. lives in MO... thats misouri!!... NO BULL CRAP  

dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/12/13
03:39 PM

guess what i set you up with a lie, so maybe NOW you'll accept the truth! dad paid $2,000 for the car, and the LT-1 had 10,000 miles... really really!! by the way one of the first things my old man did was throw the oem muncie shifter in the scrap pile, it would hang up/bind under high load and wouldnt shift into second or third gear, and no rev limiter!! guess why the engine blew? really really!! a hurst competition plus shifter worked real good behind that LT-1 though!! really really!! p.s. the car only has 48,000 miles on it today [a lot of HARD ones at that]....really  

tuffnuff tuffnuff
Moderator | Posts: 7827 | Joined: 12/09
Posted: 12/12/13
05:48 PM

Icon Quotedond1965:
nope nope nope.. late 283 crank is cast, as is 307. 1968 Z-28 engine code is MQ in cali with A.I.R. pump, the other states motor is the MO job. my pappy bought a 1968 Z-28 in 1970 off a used car lot for 1,500 bucks, blew the motor, bought a CTB code 1970 LT-1 from jacks corvette wrecking yard in norwalk cal. in 1971, cost 1,000 bucks had like 5,000 miles. pop wanted the L-88 he sold the day before!! yup 1 day late!! pop should have went 2-days earlier when he made the phone call! some ya win, some ya lose!!  now that im over 50 and think about it, that would have been a crazy super rare combo, 1968 Z-28 filled with 1968 L-88 rat! my youngest brother still has dads car. lives in MO... thats misouri!!... NO BULL CRAP



I had a crazy fast 67 Camaro with an L-88, Muncie M-22 and 4.88's in the rear.
I ran 10.90 and 129 in the 1/4 with slicks.,. this was in 1968 and I was in A/MP and A/FX class.
At the time I lived 3500 feet above sea level.

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/12/13
08:08 PM

did ya ever play grab the twenty off the dash? fun fun fun...hahaha!!!... p.s. NOW i know why they call you tough enough! THAT is a TUFF car bubba!!!  

tuffnuff tuffnuff
Moderator | Posts: 7827 | Joined: 12/09
Posted: 12/13/13
10:26 AM

I never thought about a 20 on the dash.,. but my bud was adjusting the radio once, while a 440 came along side,,,,, Gord ended up in the back seat muttering WTF, when we launched.
It was all over by the time he got the words out.
I usually played leap frog with these guys.,. teasing them along.
The closest street race for me was a 63 Nova with a SB 327, he had a 4 gear and 513's out back.,. he was screaming hot.
He was shifting well over 9 grand while I kept my BB at 8200.
I got him by 1/2 car length.,. after 3 gears.
I could almost drain a tank every time we went street racing.,. but at 35 cents a gallon for premium, who cared.,. "those were the days my friend.,. we thought they'd never end",,,, a song playing at the time.

Smile  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

dond1965 dond1965
Enthusiast | Posts: 294 | Joined: 12/13
Posted: 12/13/13
10:49 AM

mary ann faithful? those days of soda and pretzels and beer? for we were young, and sure to have our way!  

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