What is the Max HP on a sealed GM 604

late model 88 · Post by **late model 88** » Mon Jan 30, 2012 4:33 pm

I see how GM want's you to adjust the valves, any ideas to help it run better. They also want you to run Mobil 1, will it be as good as Joe Gibbs $15.00 a qt. and how many races or laps on an oil change. Is there a better place to get Crate motor info then here?

Thanks,

Lockwire · Post by **Lockwire** » Mon Jan 30, 2012 5:30 pm

[quote="late model 88"]I see how GM want's you to adjust the valves, any ideas to help it run better. They also want you to run Mobil 1, will it be as good as Joe Gibbs $15.00 a qt. and how many races or laps on an oil change. Is there a better place to get Crate motor info then here?

Those two oils are probably about 5 in the pecking order.

levisnteeshirt · Post by **levisnteeshirt** » Mon Jan 30, 2012 5:40 pm

saw 430 hp on one ,, that was with a great set of headers on a tight dyno ,,, i would zero lash the valves with it hot ,, or maybe give it 1/8 of a turn ,, but thats me

robert1 · Post by **robert1** » Mon Jan 30, 2012 5:48 pm

I can't wait for a guy that hangs out on here sometimes to come on and tell about the power he gets form crates!!!

ZIGGY · Post by **ZIGGY** » Mon Jan 30, 2012 6:20 pm

Go to the 4m.net board. Steve Hendren is a knowledgeable and helpful pro & certified crate rebuilder.

levisnteeshirt · Post by **levisnteeshirt** » Mon Jan 30, 2012 7:19 pm

i wouldn't buy a new one ,, the clearences are tight factory ,,, got a friend thats a cert rebuilder ,,, the longer they've been ran , the better they seem to do on a dyno ,, a person has to figure its because those tight clearences have opened up somewhat ,,,, these are engines that have been maintained of course ,,, but ran hard ,,, my buddy dynos all of them when they come in and leave ,, the one i mentioned that pulled 430 , had already been rebuilt once , and ran another 2 years before this ,,,, it looked great inside ,,

ProPower engines · Post by **ProPower engines** » Tue Jan 31, 2012 5:37 pm

430 is not unbelieveable. Had one up here that was the same although it was original with 1 season on it well maintained and used the right oil for the application. No I can't say but it was worth 5HP over the moble 1 but he did run a cooler.
I bet there is a bigger improvement possible by using a stress plate when they get freshened.

MaxFlow · Post by **MaxFlow** » Tue Jan 31, 2012 6:30 pm

They are great engines for what they are. 400 +/- 2 or 3 % is normal. If you want to trick them up with late model money sure more is possible.

rookie · Post by **rookie** » Tue Jan 31, 2012 6:46 pm

Depends on where you get it and how good you are at cheating.
http://www.nesmithracing.com/news11/news051111.html

sjvalleydave · Post by **sjvalleydave** » Tue Jan 31, 2012 7:13 pm

There is a guy on the 4m board, Dynoman14, who claims with his coated springs and tricked out carb, he sees BIG number for the 604...turning them 7200..He might be the guy that robert1 was talking about...

levisnteeshirt · Post by **levisnteeshirt** » Tue Jan 31, 2012 7:53 pm

they usually blow up over 6800 ran steady over that ,,,, there just isn't much there to get power out of 'em legal ,, my buddy keeps his legal ,,, yeah they respond great to changes ,, that are illegal ,,lol ,,, 15 hp just by going to a 110 LSA ,,, but ,, you can hear it and if the right guy checks it , your busted

robert1 · Post by **robert1** » Tue Jan 31, 2012 7:59 pm

sjvalleydave wrote:There is a guy on the 4m board, Dynoman14, who claims with his coated springs and tricked out carb, he sees BIG number for the 604...turning them 7200..He might be the guy that robert1 was talking about...

If I remember correctly he was saying he could make 625HP.

sanfordandson · Post by **sanfordandson** » Tue Jan 31, 2012 8:02 pm

he's known as "raceman14" on here

levisnteeshirt · Post by **levisnteeshirt** » Tue Jan 31, 2012 8:42 pm

i wonder how much nitro he uses to get a 604 to 625 hp legal

MaxFlow · Post by **MaxFlow** » Tue Jan 31, 2012 10:54 pm

You couldn't change the 604 to a 406 and get 625hp from the thing. lol

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What is the Max HP on a sealed GM 604

What is the Max HP on a sealed GM 604

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