750 hp hawk engines tech info[some,not all]
 

im finding out more info around every corner,first these are 588c.i,tall deck engines,built in 1990 by ''sonny leonard'' for hawk marine,they built 33 engines
1.,9.6 to 1 comp
2.,dart pro 1 heads 395's[yes they only make 345's,but these have been ported and polished] ,114 cc chambers,2.350in,1.90ex valves
3., crane cams mech roller, .735 lift,262/274 dur,on 107,.022 lash
4.,cola cranks
5.,carillo h-beam rods
6.,je pistons ?
7., sar/dart intakes[ported and polished,to match heads]
8., holley 1250cfm reworked by ''sonny leonard'' to 1350cfm
9., 32 degs of timing

this is all ive found,anybody have anymore info ?

Lot's of better ways to make power. The cylinder heads and carbs are too big for that combo.

im just passing on the info,its taking me a long time to find ,just the little info,for any other hawk owners

I understand... If you ever do any upgrades I can help. There is a easy 100 horsepower to be gained @ the same compression ration.:D

what do you recomend ?

I would like to know the same for a Hawk 525. I was told it was a 454, but saw online under a SEC filing for the company, they have it listed as 496.

If anyone has the specs i would appreciate it.

I use to do alot of machine work for Hawk if the cranks have a 3-4 digit number in the front of the snout they may have been machined by us for Hawk just before they closed. As far as I knew all engine assembly and dyno tune was done in house or that's what they claimed Bud that was the man in charge was a good friend of mine. Sincerely Laz Mesa
www.mesabalancing.com

If I remeber correctly the Hawk 525 was basically a MERC 420 (454) with a B&M 174 on top, I think the carb was a Holley 850. Higher comp than MERC 525SC. I built 2 out of my old 420´s reliable turnkey motors.

bl

my 588''-750's were built by ''sonny lenard'',,they built 33-588'' engines in 1991 for hawk marine

From what i know about mine, it has a B&M 240 & a single Dominator 1050. This weekend i will be back down at the boat & will take more pics. But have no clue on the internals.

Sonny built alot of the big cube stuff for Hawk. Alot of drag racing technology used. Mr. Horsepower is right on with the intake system being way wrong for the application. I've seen and run a few of the Hawk 1000's. 700 inch tunnel ram motors. They were all NHRA Pro Stock technology from the day.

what would you guys use on these and how would it help?

Exactly what I was going to say. Sonny built a boatload of drag race stuff and all quality pieces. But, as many on this board have learned (some of us learned the hard way:D) drag racing and marine engines are totally different creatures.

Like was said, its a Merc 420 with a B & M 174. Yours have been upgraded to 250 blower--thats a good thing:D

Here's an ad with what look to be 525hawks.

http://www.offshoreonlyclassifieds.c...o23315-en.html

so what is a merc 420? a 454 that has 420hp?

my top end looks beefier compared to the pic. the guy i bought it from said he had it dyno'd & it was putting out around 640hp (if i remember correctly).