Who's got them 454??

[sick69]

These trucks did come with big blocks in them so if your going to order or buy a shroud,,, Just use 396 or 402 as an engine ,,,they have the same outside dimensions as a 454. You will need to know what other stuff you have though,,,ie, long/short water pump early or late mounting set up(looks like the right one for the truck) what fan you have and if your going to need spacers or not, if your engine is mounted in the forward or rear mounting position?



Frank

[chirt]

Originally Posted by sick69

These trucks did come with big blocks in them so if your going to order or buy a shroud,,, Just use 396 or 402 as an engine ,,,they have the same outside dimensions as a 454. You will need to know what other stuff you have though,,,ie, long/short water pump early or late mounting set up(looks like the right one for the truck) what fan you have and if your going to need spacers or not, if your engine is mounted in the forward or rear mounting position?



Frank

How will I know if the engine mounted in the forward or rear mounting position?
Sorry for the stupid questions but it was somebody else who installed this engine so i don't know.

[sick69]

I'll try to get pics of the two mounting positions tonight. My front wrap is off so it should be easy.


Frank

[Longhorn Man]

your fan is close enough that you won't find a shroud that'll fit, and in reality, its close enough it won't do a whole lot.
If you want it bad enough, it'll have to be custom made.

[chirt]

Originally Posted by Longhorn Man

your fan is close enough that you won't find a shroud that'll fit, and in reality, its close enough it won't do a whole lot.
If you want it bad enough, it'll have to be custom made.

what if I installed a short pump do you think i would have room then?
and has anyone used electric?

[chirt]

Originally Posted by sick69

I'll try to get pics of the two mounting positions tonight. My front wrap is off so it should be easy.


Frank

Thanks! I appreciate it!

[tecky11]

my 2 cents. i dont drive a chevy yet, how ever i do drive a big block Intl truck. i will only run clutch driven better cooling and i have nver overheated even with holes in my radiator!

[mikey531]

What I would do is do what I did on my race truck, I bought a shroud from here,

http://cmwraceparts.com/grp6B.php

Just trim it to fit, you may need to cut a lot off to get it to fit or you could also go with an electric fan. Some of the electric ones have a shroud built in.

[petey-pablo]

I am using Stock Dual Cooling Fans from LT1 Firebird Trans Am/Camaro PO had them installed when I bought the truck it cooled fine when I would drive it and he didn't seem to have any problems with it. you can get them on Ebay all day long real cheap..........

[chirt]

Originally Posted by petey-pablo

I am using Stock Dual Cooling Fans from LT1 Firebird Trans Am/Camaro PO had them installed when I bought the truck it cooled fine when I would drive it and he didn't seem to have any problems with it. you can get them on Ebay all day long real cheap..........

Do you have pics of it installed on your truck? I'm afraid that will hit the alternator and the power steering pump on mine.
and i have only 3 inches of clearance between the WP and RAD.

[mclairmo]

With only 3 inches of clearance, very little is going to fit in there.

[SOON2BLAZE]

this should do the trick. Mine will be here this week. http://www.summitracing.com/parts/FLX-410/

[mclairmo]

Originally Posted by SOON2BLAZE

this should do the trick. Mine will be here this week. http://www.summitracing.com/parts/FLX-410/

Is 2,500 cfm enough airflow for a big block? I have read on manufacturers' websites, like Permacool, that big blocks need more than that. I have the Black Magic M150 that flows more than 2,500 cfm and it barely does the job on my 396.

[chirt]

Originally Posted by SOON2BLAZE

this should do the trick. Mine will be here this week. http://www.summitracing.com/parts/FLX-410/

I really hope it works buddy! If it does I'll sure get one of those too so far I've tried one 16 inches 2500 cfm with a 12 inch on the side flowing 1300 cfm 3600 all together but, no shroud then I tried two 16'' 5000 cfm together but of course that one of them was kind of 4 inches out of the radiator fins and that was no good, and another thing is that the two 16 inches fan were bought cheap from e bay so I'm praying your setup works.

[chirt]

Originally Posted by mclairmo

Is 2,500 cfm enough airflow for a big block? I have read on manufacturers' websites, like Permacool, that big blocks need more than that. I have the Black Magic M150 that flows more than 2,500 cfm and it barely does the job on my 396.

maybe It's 2500 each

[mclairmo]

Originally Posted by chirt

maybe It's 2500 each

Not from what I read and not based on looking at it.

[chirt]

Originally Posted by mclairmo

Not from what I read and not based on looking at it.

You're right 1250 cfm each

[SOON2BLAZE]

just curious, does any one know how many cfm a stock fan and shroud pull? Is it more the two duals pulling the 2500? The variable speed control running till cool down has to help vs a stock fan stopping when you kill the engine.

[Longhorn Man]

there is absolutly no point in running your fan after the engine is shut down. (talkin street, not drag) Electric fan, mechanical fan, they all shut off when you twist the ignition to off on a factory application becouse the engineers already know this. Every time I say this, I get all kinds of ppl on here saying electric fans stay on, however I think only one odd ball car does that, the rest, shut off with the ignition.
think about it for a second... the fan cools the coolant that is in the radiator, then that coolant goes and cools the engine. So if there is no water pump to push the coolant, then why put such a big load on the battery to cool off coolant, when it can't cool the engine?
Engineers may make things hard forr mechanics, but they generally know what they are doing. (with the exception of the ones who did the early 80's escort engine!)

[mplex2000]

I agree Longhorn man, there is no reason to keep cooling the coolant after the engine is shut off, but I know at least all of the cars I've owned newer than 2000 will keep the fan running. My current car runs HOT and likes to run those fans all the time, even when I'm walking away.

[Rreemo]

I've got a 454 in mine...running a factory style 4-core radiator, original GM big block fan shroud, and a stock 5-blade fan on a thermal fan clutch. In the heat of the summer here in Texas (it gets plenty hot here) running the AC it typically runs around 190-195....if I sit at idle for extended periods it will creep up in the 200-205 range...of course turning the AC off helps.

[Old Red]

Hi there I am a new guy long time listener first time poster.

FLEX FANS are dagerous I had one blow I was passing a car and bang a nice dent in my hood sweet

Also I have a 454 with 10.2:1 compression and never really had problem I am using every thing that would have come on a stock 396/402. For a couple years I never a fan shroud It was never really a problem. If I would sit traffic on a super hot it mite creep up a bit.

My dad also has 402 in his with about 9.5:1 no problem either the cooling system is also stock.

Could you be running lean or to much timing.?

The stock shroud at the top mounting holes 28 3/4 and I measured my big block 78 burb and it was about 26 you mite be able to make one fit with some fabing I took a picture of my stock shroud and the burbs shroud. I see if I can get the pictures on.

[FRENCHBLUE72]

HEY M PLEX CAN i SEE A BIGGER PIC OF UR AVATAR?

[Old Red]

Here is some pictures to compare stock shrouds