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earntaz
12-10-2013, 06:05 PM
Need some help with identification of some Big Block Chevy parts I have. Eons ago I did some swapping of Chevy parts and I wound up with a 4.250 stroker crank along with a set of 6.405 rods. The crank is forged and has a cast mark of 3521 and stamped M525. 3521 cranks were produced in the late 60s and early 70s from what I can tell. The rods have the name “Kiekhaefer” cast on the side with the number 621-3404 cast on the opposite side of the rod. The rods have been “worked” (polished, rough edges removed) with full float pin bushings and have an “A” beam shape similar to an FE 427 Ford connecting rod. The only reference I have come up with is in H.P. Books ... How to HOTROD Big-Block Chevys by Bill Fisher and Bob Waar. To quote them: “Chevy developed the 482 Chevrolet Turbo-Marine engines”. They go one to say that “Chev made 25 of these motors for Kiekhaefer and were destined for off-shore long distance racing and a few rods, cranks, and pistons were available for a short period of time”. This is a long shot, but is there any way of telling if these parts are part of that batch? The TAZ

earntaz
12-11-2013, 09:00 PM
I knew this was going to be a tough nut to crack ...

earntaz
12-14-2013, 06:58 PM
Over 130 have scoped this out an no comment? Must be much rarer then I thought...

bofus
06-16-2017, 02:13 AM
I have 7 rods and looking for an 8th. Any ideas?

earntaz
06-16-2017, 02:57 AM
Try Marine Kinetics back east ... TAZ

http://www.marinekineticsonline.com/index.html

Lee Stewart
06-16-2017, 02:58 AM
The parting line on the forging is hand ground smooth the full length of the rod. Areas around the bolt seats are given a generous radius to reduce the potential for stress risers. GM had a design sheet for race preparation of the dimple rod. The Kiekhaefer rods are prepped in identical fashion.
There were 25 of these engines assembled at GM in cooperation with Kiekhaefer. At that time all production Chevy big block packages were designated “Turbo Jet” engines. These development engines were designated 482 Chevrolet “Turbo-Marine” engines even though none were ever turbocharged.

The architecture of packaging a 4.25” stroke into a Std. deck block was much more challenging in the late 60’s, early 70’s than today. There were no aftermarket 4.250” cranks or shelf stock piston pin heights raised .125” or 6.385” connecting rods available at that time. That left two choices for an engine builder. Sourcing a costly custom crank from Moldex or Hank the Crank, or welding and offset grinding a OEM crankshaft, using a Std, piston pin height, a long rod, and a raised deck block. Kiekhaefer , had semi finished rod forgings made that would accommodate the necessary 6.405” c to c length of the rod to package the assembly. The packaging of the assembly is why a tall deck block had to be utilized, in spite of its inherent design disadvantage.
What is a routine 482/489/496 build today, utilizing parts sourced from the aftermarket, was considerably more difficult in 1969.

Block deck dimension Std Deck (454)____ 9.800”
½ stroke/stroke radius_______2.00”
Rod C to C________________6.135”
Piston Compression Ht._____1.645”
Piston to Deck_____________.020”
Total_____________________9.800”


Block deck dimension Tall Deck (482)____ 10.200”
½ stroke/stroke radius_______2.125”
Rod C to C________________6.405”
Piston Compression Ht.______1.645”
Piston to Deck_____________.025”
Total_____________________10.200”

https://s11.postimg.org/j1yak5l9v/download.jpg (https://postimg.org/image/mybmg569b/)

https://s14.postimg.org/bk4aal72p/2uyrqmf.jpg (https://postimg.org/image/wtrwlfnd9/)

http://www.offshoreonly.com/forums/general-q/323016-shim-not-shim-valve-springs-4.html

Lee Stewart
06-16-2017, 03:26 AM
https://s13.postimg.org/x1t85q1bb/brochure2a.jpg (https://postimg.org/image/bs5luvl0j/)

olredalert
06-16-2017, 01:08 PM
----I was just about to suggest going on the Off Shore Only website and ask those guys because some of them pretty much know everything about Mercruiser Racing (Kiekhaefer) stuff, but Lee beat me to the punch......Bill S

Verne_Frantz
06-16-2017, 02:39 PM
I don't have specific information on the engines in question, but Chevy made quite a few marine engines for different companies. My Tonawanda production totals showing engines shipped to Kiekhaefer as of 7/17/69 are:
3951055 normal rotation: 1200
3951056 opposite rotation: 176

It also lists:
3962652 Hi-Perf normal rotation: 1

I have no idea what these engines consisted of. Maybe someone can find references by part numbers.

Verne

For added interest, here's a twin turbo version shipped to Daytona Marine.
95609

SuperNovaSS
06-19-2017, 04:10 AM
The 3521 crank was produced as a standard 454 crank with a 4 inch stroke. Are you sure it's a 4.25 stroke?


Jason

njsteve
06-19-2017, 10:40 AM
The original owner of my SD455, Enrico "Rick" Stein was a powerboat racer of note, back in the day. He ran all sorts of Chevy engines in his boats - 409s, L88s, etc. I'll drop him an email and see if he can answer your question.

L_e_e
06-19-2017, 09:29 PM
Sounds like the parts are from a KAM (Kiekhaefer Aeromarine) Champion Maker 600 or 625S
Walker Forge of Racine Wisconsin supplied the rods with the Kiekhaefer logo.

njsteve
06-25-2017, 08:48 PM
This is what Rick (Enrico) had to say:

I'm sorry it's taken so long to get back to you on the above subject buy my recent eye surgery has slowed me down a bit, at least for the moment.

Back in the day, for me in the fiftys and sixtys, Carl Kieckhaefer who created Mercury Outboards and ultimately Mercury Marine kept a company called Kieckhaefer Aeromarine strictly to build racing engines. His stuff was usually built around Chevy Parts many of which were created by GM just for him. Although Mercury utilized mostly Chevy engines to marinize they did utilize some Ford engines for their stock outdives.

After being out here in Arizona for forty years I had almost lost all contact with the marine / boating industry. Then, out of the blue, I started receiving email from an organization called National Powerboat Association. Purely out of curiosity, I contacted them and as a result struck uo a friendship with their head honcho. Hi name is Billy Frenz and his organization promotes all kinds of fast boat competition. When I say fast I mean FAST!!!!! Many of these rigs will hit 150 MPH and they run as large as 52 feet.

The power it takes to drive a rig to these velocities is awesome. In addition to Mercury Racing, a whole industry of race engine builders has sprung up. Some of these engines are built by Mercury and others by a plethora of other builders. Many of these rigs are hybrids, assembled from parts of many specialty manufacturers. Only someone intimately associated with today's high performance market might be able to help your friend identify what he's got.. For this reason I suggest your friend contact Billy Frenz and use the name Rick Stein as a referral as that's the name he knows me by.

To define fast a little further, let me tell you about a friend of mine. He owned a 48' Catamaran powered with a pair of 1,300 HP Mercury Racing Engines. In an attempt to set a new Around Long Island record which he already owned he, in a fog bank, hit a 10 Ton buoy at 138 MPH.
I've seen the video, taken in real time from a camera mounted in the boat. He and two crew members survived but the boat was damaged beyond repair. Since the "accident" he has commissioned a new boat. This one's 52' long and packs a pair of 1,800 HP engines. She ought to be able, under ideal water conditions, to reach 175 MPH. The rooster tail at full chat will hang nearly 10 tons of water in the air.

Lest you think you can compete on the cheap, my friend owns two Ferrari / Maserati Dealerships. Today's racing in this league is so far removed from my day it defies description. That's why Billy has had me write multiple short stories about what Offshore Powerboat Racing was like in my day. He says he will be publishing some of my scribblings..

At the risk of breaking my arm patting myself on the back I believe we still own the record for circumnavigating Long Island in a single 90 Cu. In. Outboard. We set it all the way back in 1964 using a 16' Glastron Thunderjet. At 6'8" and 260 pounds with my co-driver at 6'3" and 225 pounds the New York Paper (The World Telegram & Sun). Described us as the two biggest guys in the smallest boat. Our top speed with 100 gallons of fuel aboard was 50 MPH with co-driver literally sitting on top of the engine for the whole length of Long Island Sound. The true definition of an Iron Butt.

Here's the dope you need to contact Billy and pick his brains.

NATIONAL POWERBOAT ASSOCIATION
Website: www.nationalpowerboat.com
Mailing Address: Billy Frenz
30 Morgan Avenue
Greenwich, Connecticut 06831-4940
Tel/Fax: 203-532-1312
E-mail: [email protected]
Or
[email protected]