Over Heating 604 Crate Question

[rubbinsracin]

We run a 602 with our nose on the ground, notch in the valance, 27" double pass afco rad (only because when we put a rock through our old single pass the double was all they had on hand to replace it on saturday morning ), 1:1 pulleys (the belts we buy from our local auto store are always looser than we like but after reading what brad said its not such a bad thing), we run a racing thermostat only because up north half of our season it is 45* to help the car warm up. stewart stage 2 pump with a 17" GM style 4 blade fan when its hot and a plastic flex fan when it is cooler.

i would say the biggest thing you can do is a good shroud. makes a huge difference.

[7uptruckracer]

Yeah I run Double as well keeps it in the radiator longer for more heat exchange it gets hot here in VA sometimes. I just set my belt tension like you would any other car. I run Alternators on my stuff to so maybe I'm just weird. Good Pump, Good Pulleys, good shroud and some nose ducting in front on mine to direct air flow into the radiator, and a good valance notch with a good GM 4 blade fan, and you should be ok I'd even check your cap for good measure. I take mine out and clean them or soak them/ boil them ever few weeks they will get packed through out the season. I baby oil mine and run shaker screens as well to keep dirt off of them

[toyracer]

thanks for the responses

Figured out last weekend distributor was going bad and timing was jumping around. Glad we didn't melt it down.

Put in new distributor and it ran 195-200 all night long.

[dirtslinger71]

Maybe this has been answered and I over looked it... what is the standard set up for these 604s? I ran a steel head motor forever with a double pass radiator, Stewart pump, 30% reduction pulleys and a 3/4 restrictor and no shroud with 18 inch 4 blade fan. Ran 210 always! Same set up with 604 and runs 230 in dry slick and not hard on the throttle. Next track is big half mile that's always heavy and know my problem will b worse... any suggestions would help. Thanks.

[Egoracing]

Single pass radiator, no restrictor, good pump, 1:1 pulleys, GM fan and a good shroud. Ran all over the south east and never had a cooling issue, even with 100+ degree air temps.

[rubbinsracin]

x2 on what Ego said. We only run a double pass cause it was all they local speed shop had on hand when we needed an immediate replacement. i find that it made zero difference in cooling on these cars.

[dirtslinger71]

x2 on what Ego said. We only run a double pass cause it was all they local speed shop had on hand when we needed an immediate replacement. i find that it made zero difference in cooling on these cars.

Thanks guys I thought that was what I needed but wasn't sure on the pulleys.... and did research on the gm fan and no longer available so I called CV and they said they only sell the allstar fan now so that's what I'm stuck with...

[Mod77L]

Get the GM fan here:

http://www.amazon.com/gp/product/B000IZ26E0/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1

[brad hibbard]

I don't think that amazon add is for the GM fan that we have always used

the GM fan that pulls the most air of any fan we have ever tested is 405442 and it has NOT been discontinued by GM

they have become very proud of it in recent years and the price reflects that pride but they are the best cooling fan out there in my opinion-------they also rob the most HP---but you can't win if you can't finish

we have plenty in stock if you can't get them at your local dealer

Brad

[stockcar5]

I don't think that amazon add is for the GM fan that we have always used

the GM fan that pulls the most air of any fan we have ever tested is 405442 and it has NOT been discontinued by GM

they have become very proud of it in recent years and the price reflects that pride but they are the best cooling fan out there in my opinion-------they also rob the most HP---but you can't win if you can't finish

we have plenty in stock if you can't get them at your local dealer

Brad

Yes that is the same fan. I posted comparison pics of it a couple weeks ago. Same fan just in an ac delco box.

Cross-reference numbers: https://acdelcooutlet.com/index.php/15-80752.html

[brad hibbard]

WOW---that would be great to be able to buy that fan at an affordable price again

any chance you could repost those pics----not that I don't trust you --I just want to be sure before ordering

we sell 50 to 60 a year so I won't hold back when ordering

[powerslide]

http://www.4m.net/showthread.php?303...-vs-the-others

I bought the same fan and brought my temp down 30-40 over a smaller 4 blade. It didnt even have as much pitch as the other one pictured in his thread. It has the balance rivet on it as well.

[brad hibbard]

OK --we will see in 5 to 8 business days LOL

[powerslide]

they use to have a picture in the ad not sure why they took it down. Also if you scroll down it has the OEM number listed.

[dirtslinger71]

Thanks for the info guys! I did exactly what you said and car never went over 200*!