water heads

i have dart 345 pro 1 water heads on my 540. i have had the heads and havent had the money to change them out from the motor it is a 540 that is 12.5 to 1 in a new century solid block. msd 20 mag with a ssi f rotor 14.71. im at 35 over on the blower and would like to no what will happen if i turn the blower more? we run mud drags that are around 2.5 sec long. has a buzzard on it also.

 

Be careful, the Pro 1 heads are a thinner casting than the 320/360 race series.

 

I've got 25 lbs of boost on the 345's and have no problems at all ! We run them at 8300 rpm.

 

Brian;

Keep in mind, you're not running a SSI F-Rotor at 35% over on a 12.5:1 motor either.

 

Hard to say how much he has ? I'm gonna run that screw on them and see if they take it !

 

Heads

I would think?That you are about at the Limit???
But,theres 2 things that you could do?
1-Fill the Heads?
2-Sell them and put a Solid Casting on!That is while there still Selleble?Cause,once you go to far.....................?
Later
Greg

 

Now, I like that idea.

And yeah, once you fill them, it's pretty limited on application. There's been a set of filled heads on Racing Junk now for over 6 months. Guy can't hardly give them away.

 

yeah i would love to sell them and get a set of solids but at this point i cant afford to do that. just bought a truck and got everything up and running. i get 35 to 38lbs with the setup i have. i would like to spin the blower faster to see if it would help.what do you fill them with? and if you hurt one after filling them can you still fix them

 

Heads

You would Fill them with Hard-Block Compound.This is what you Fill a Block with.I know Years ago there were some Guys filling them with Devcon?
Not problem fixing them,once they have been filled!
But,if you fill them?Then the Market Closes in on the Value!!This is what you want to think about?As of now you could sell these to almost anyone,because they could have Water ran thru them for cooling purposes.Once they are Full,ALKY or FUEL ONLY!!!
There are Good Deals on Solid heads out there?Like these Bob Morgan Billets that i have?Another Good Choice is a Old set of Dart 360's.Which is a Very Versital Cyl.Head!
Just Something to Keep in MIND>?
Later
G

 

solid heads

I must say I never gave it any thought I have a jet boat and this year we changed huffers and are making 25-27 psi depending on the air we are still testing only turning 75-7800 spinning 26 od 1471 hh mini retro but it only makes sense now I am worrying I had plans on making 30 psi now I may whip out the paddle and go back up stream any input would be great thanks Craig

 

I had a set of 427 pontiac heads and was told 45 lbs of boost was about all they would take.I ran them for 4 years mud racing with no problems.I saw an add on here for a set of billet BAC-MAN heads and bought them and turned around and sold the pontiac heads for the same money I paid for the Billet heads. I had to buy a set of pistons but I now have piece of mind. So you can make the change pretty economicaly. Another friend of mine has a set of the 360 heads and has had no problems with 45lbs of boost either.