440 rb block number advice please

charger01 · Post by **charger01** » Sun May 29, 05 8:54 pm

Can anyone tell me exactly what these letters on the block stand for?
It reads...

H440
HC 10729
526 HP

Any help or advice welcome

Dave-R · Post by **Dave-R** » Sun May 29, 05 10:27 pm

http://www.yearone.com/updatedsinglepag ... einfo1.asp

Cannonball · Post by **Cannonball** » Mon May 30, 05 12:02 am

think that means 68 440 high compression/high performance you need to run good fuel in that and some octane booster. the mtr did get a check over before it was fitted, think it also has highway gears in the rear about 2.94 ratio good top end

Dave-R · Post by **Dave-R** » Mon May 30, 05 9:11 am

If you go through the pages I posted a link to you will see that the letter H in front of the 440 means it is a 1972 engine.

This is a more direct link to the correct page.
http://www.yearone.com/updatedsinglepag ... mbers3.asp

charger01 · Post by **charger01** » Mon May 30, 05 7:12 pm

Thanks for the info,looks like i have an engine built on 7th october 1972 & it was number 29 built that day,H.P checks out as high performance,havnt managed to find out what the 526 in front of the Hp is for yet,2.94 ratio gears would add up Dunc, it will cruise happily @ 80-90 on the motorway.
Thanks to both of you for the info

Adrian.

Cannonball · Post by **Cannonball** » Mon May 30, 05 11:08 pm

is the 526 in bigger style stamping????????? if so it could be a x jensen engine that would be there stamp marks

charger01 · Post by **charger01** » Tue May 31, 05 11:01 am

Hello Dunc ,the numbers are no different in size to the others,
but are spaced out like this,

5 26HP
If that makes any sense

Adrian

Jim · Post by **Jim** » Tue May 31, 05 11:44 am

I reckon 5 26 looks suspiciously like a date code for the 26th May.

The October date if cast on the side of the block will be the casting date.

If you have an October build date on a H440 stamped block, - that would be 1971 not 1972.

charger01 · Post by **charger01** » Tue May 31, 05 12:59 pm

numbers are all at the top front of engine Jim like this,

H 440
HC 10729
5 26 HP

Adrian

charger01 · Post by **charger01** » Tue May 31, 05 1:03 pm

Just been looking at pics of your car Jim, stunning!

Dave-R · Post by **Dave-R** » Tue May 31, 05 1:31 pm

I think he was correct initially in that he read the correct numbers as the date and daily sequence number. Although Jim is correct (of course!) that it would be October 1971 for a 1972 model year.

You can confirm this by looking at the date cast into the side of the block. It was probably cast in August or September 1971.

What those other numbers are though has me stumped.

Jim · Post by **Jim** » Tue May 31, 05 1:41 pm

I'm on shakey ground here, but i am quite sure you have some things wrong.

I am sure the build date is 26 May 1972. Check the casting date on the left side of the block near the starter motor, - this will be some months before the build date.

Otherwise I am quite sure the build date would be in 10,000 day calendar displayed in an eight figure format, but this is rarely seen on an engine as late as 1972.

For example a 440 engine produced for the 1972 model year may have the 10,000 day code as follows: PT44037230029 this would indicate the 29th 440 engine assembled at the Trenton engine plant on 7th October 1971. - But i don't think this is the case with your engine.

At this moment i don't know what HC 10729 means. HC might mean high compression i suppose (probably does), - but 10729? To break it down as the 29th engine built on the 7th October is certainly not correct. For one thing Mopar never used that format as a date code, and anyway 107 would be January 7th, not October. (A three figure code for October 7th would be A07.) Other date codes were used by Chrysler, for example 417 could also be October 7th (day 7 of week 41) but this was not used on engines.

Do you have a VIN number stamped on the pan rail on the right side of the engine?

Dave-R · Post by **Dave-R** » Tue May 31, 05 1:45 pm

Jim wrote:107 would be January 7th, not October. (A three figure code for October 7th would be A07.)

You have a point there Jim!

Dave-R · Post by **Dave-R** » Tue May 31, 05 1:47 pm

Jim wrote:Otherwise I am quite sure the build date would be in 10,000 day calendar displayed in an eight figure format,

I thought of that Jim but couldn't make that work out either no matter how I joined up the numbers.

charger01 · Post by **charger01** » Tue May 31, 05 6:56 pm

ok been getting dirty from starter motor to front of car number is

0888969 from what i can see through the orange paint

Adrian