are all 1969 350 engines coded HV 2 bolt mains?i have looked this motor up and it only shows the displacement,horsepower,and 4 barrel carb.
thanks in advance

If its a 010 casting number it can be either 2 or 4 bolt.....

if its 3932386 or 3932388 block they also can be either 2 or 4 bolt mains. :D

i have a HV coded motor thats a 2388 casting dated Nov. 68'
and it's a 2 bolt out of a 69' Caprice.
the block in ? is a 010 HV coded motor out of a 69' Impala,casting date june 69'.i was just wondering if they(HV coded blocks)were all 2 bolt mains.........i hope not.
seems like the big bodied cars would all come with 4 bolt mains.
i thought maybe someone knew off hand.
i found the block at a wrecking yard.i guess i will buy it and cross my fingers.

Billy the blocks were made in both 2 and 4 bolt styel. Large cars like Impala and Caprice and the Camaro and Nova all had the same engines, without regard to 2 or 4 bolt mains. Seems it was random as to which car got which block as they were stamped with the VIN on the block or the oil filter pad at the time the cars were built in the factory. A large car, Impala, didnt necessarily get a 4 bolt main engine. CRG (http://www.camaros.org/drivetrain.shtml) has more info. on the blocks as does Al Colvin's book "chev by the numbers" which is good reading but some older versions have some outdated info. in them yet too.

in case i confused anyone(or maybe confusing myself,it's late),i was talking about just the HV coded 350 blocks and not 350 blocks in general.
so the motor i am thinking of buying,V1118HV 69' 350 255 horse motor, could have either a 2 or 4 bolt mains?
with a DZ you always know your getting 4 bolt mains......

thanks for the responses and putting up with me.

That's an LM1. Probably a 2 bolt. Chance it could be a 4 bolt, but not a sure thing.

The timing cover is worth a buck or two.....

it also came from the factory with a 772 fan,and 8 inch harmonic balancer etc.

wouldnt most if not all the bolts(markings) be the same as on a 69' Camaro motor?

Exactly the same.

thanks guys

That's an LM1. Probably a 2 bolt. Chance it could be a 4 bolt, but not a sure thing.

The timing cover is worth a buck or two.....

I've seen both 2 and 4 bolt 388 Camaro LM1's. Casey's Camaro LM1 is a 388 4 bolt. The 3 speed Camaro LM1 I had was a 388 2 bolt.

I wonder if the impala / chevelle (nova?) LM1 engine cars got any additional goodlies like the camaro did?

Yes, like I said, an LM1 could be a 4 bolt. But most are 2 bolts.
Chevy treated all pass car applications the same - depended only on HP. It was the same shortblock, just different exhaust manifolds.

Kurt:
Not to hijack the thread, but, the camaro got some/many HiPo goodies when the LM1 was ordered. How about the Nova, Chevelle? ie, did they get 12 bolts instead of 10 bolts. Don't know much about them, but in 70 did the Heavy Chevy's get 12 bolts?

Just wondering what it was about the Camaro LM1 block, that pushed the order into the HiPo status (12 bolt, Muncie vs Saginaw). As has been stated, the HP was not that special, and did the "other" sporty cars get the same treatment with their LM1 optioned engines?

Finally, on the other engine RPO's (L65 and L78 etc) when did they get the heavier HiPo stuff, and was it consistent with the same Camaro RPO engine types?

Thanks,
Rich

the 69' Impala with the HV motor in question came with a turbo 350 and a 12 bolt rear end.
i wonder how much those 12 bolts are worth,and how much demand there is for them?
were the HV coded motors only used in the Caprice and Impalas?
i thought i read somewhere that the HV motors were also used in Corvettes also.

Chevrolet was not always consistent, but the L30/M20 upgraded the drivetrain in other cars. From what I've seen, the same with the LM1.


HV had the wrong pulleys to fit into a Corvette.

i thought i read somewhere that the HV motors were also used in Corvettes also.

The only "HV" code engine ever used in a Corvette was a '65 327/350 with transistor ignition, and that was a 3782870 block. :thumbsup:

Hey John,
i was cleaning(scraping)the HV block and noticed under the factory orange paint the suffix letters HV written in yellow upside down on the driver and i think passenger side between ths freeze plugs. Was this a common practice on all blocks back then at the Flint and other foundries? I can try to get a picture if you would like.

thanks

Hey John,
i was cleaning(scraping)the HV block and noticed under the factory orange paint the suffix letters HV written in yellow upside down on the driver and i think passenger side between ths freeze plugs. Was this a common practice on all blocks back then at the Flint and other foundries? I can try to get a picture if you would like.

thanks

Yes - every block was marked on both sides in grease pencil with the suffix it was to be built to, while the block was upside-down in the bore air-gaging station at the head of the line. It stayed upside-down for about eighteen stations (cam, main bearings, crank, main caps, rod/piston stuffing, oil pump, timing set, timing cover, oil pan, balancer, etc.), then was rotated up to install the heads, lifters, pushrods, intake, valve covers, distributor and water pump, then the front pad was stamped with the same suffix that was grease-penciled on the side of the block. The engine was painted after hot-test.

:beers:

Thanks-I love finding out what went on at the factories back when these 1st gens were being built.

Here's a photo taken during piston-stuffing (which was done at 170 engines per hour) that shows the suffix code grease-penciled on the side of the block. :thumbsup:

John I now this is straying a little but @170/hr approx. how many engine lines were running to build that many? just curious? thanks, Kevin

What are the other letters/numbers etc. toward the front of the block in the picture as my block has that also.

Thanks John,I wish there was a way to download all of your knowledge from working at GM.