Fr. Frank

In addition to the 250c.i. 165 hp, sterndrive, Mercruiser also made a 150 hp version, and a 180 hp version of that block.

But the cream was made from 1972 through 1974. Mercruiser made a 250 hp I-6 sterndrive called the "250/250", for 250 cubic inches and 250 horspower. It was a 250 c.i. 6 cylinder Chevy block, with a high-lift, long duration camshaft, polished intake, through-hull exhaust, and a 625 cfm Quadrajet carburetor.

I can't speak for the Cigarette and which setup it had installed, but I have seen these 250/250 motors mounted in three different boats: a 1973 24' Martini, a 1974 25' Wellcraft Nova, and a 1974 23' Formula Thunderbird, and I know of at least one '74 Slickcraft SS-245 Sport, although it had been repowered with Gil-brackets and 3.4L Mercury OBs by the time I saw it.

The only one I ever saw run was the Martini, whose owner claimed a top speed of 54 mph.

h2oboater

I think this was it.

tag1

speed with the in line 6's?--about 1mph for every hundred of rpm.they red line at i think 4600.i had one for 20 years a '72 model it is now in st louis still going strong.i had it in the bahamas many,many times it is a really unique boat the teak looks killer when varnished(i did this to mine)i thought about small blocks many times;... cigarette factory told me not to do it as don designed it to handle the in line 6's.what you can do though is hop up the 6's.may old stock car racers will tell you you can make them run with v8's.my problem was with the old original drives ;they had the mercury switch that killed the engines when shifting....this is the problem see,all the power you get from a 6 (when you hop them up,is in the valve work via cam,carb,,ect.and it will idle rough so the old fashioned drives would not work. for this; you would run into every dock trying to get you engine started when trying to reverse.with bravo's though you could probably get it to work i eventually went to alpha's;then sold the boat.the alphas would have been okay as well i imagine if i had hopped it up any.tip: i repowered with 292's (the old bread truck motors)they are a little bump in hp,and you can run 4bbl carbs on them ,and slightly taller .you were able to get target motors from chevrolet,maybe not any more but in the late 80's they were still available.mercury had a option for these motors as well and they came from the factory with a 4bbl carb if i remember right.these work too you just have to cut the motormount springs in half.another thing i did was have a company called marine manifold in long island make me up a pair of copper water jacketed maniflods for thru hull.with both engines running they sound like a v8.they worked great and are still on the boat i had them made in 1980,and they are still working fine.i just sent them an original manifold and they copied it. i would highly reccomend the company.i had them custom make a pair of old chrysler hemi manifolds as well for my 50's hemi's i had in a boat i lived on.if anyone is interested i can call the new owner of it and the city on long island is still on the name plate of the manifolds.definately go with thru hulls,it makes it alot more fun!!!i am about finished restoring a 28ss.i go get it in miami next weekend from the upholstery shop.do not feel embarrased with the 6's YOU CAN make them run and they are tough and a good torque motor.when i pulled a skiier i had to only use 1 motor and then slightly add throttle,otherwise it would pull the skiiers arm socket out of place.it will pull 2 skiiers up instantly with 1 engine--keep the six;s change your drives to modern drives and use the 6's they are SO EASY TO WORK ON. my 28ss with new 383 strokers in it are going to be a nightmare to repair anything.out with the engines to do about anything.i can see that already.good luck!!

tag1

one other thing the old original pictures of it when it belonged to the lady from new had the original seats in it.the ones now are definately not original.the originals seats had an aluminum rod sticking out each seat bottom to screw in/out to allow you to ajust the seat forwards or backwards as far as you wanted.then screw it clockwise back in to lock the seat base

BUIZILLA

the 180 was a 292 block 2bbl..

actually it was rated at 185,,, massive head cracking and head gasket problems though.. alum block and steel 460 head??

the basic 4bbl 292 was about 200-205 hp and GREAT torq, it would run right with ANY 302 Ford in the day, back in the late 70's a friend and I built a pair of 292's with Clifford intakes, Isky cams, and 390 Holley's, we balanced them carefully (mega importance here) about 240-250hp... and you could run them at 5000 rpm all day long and they didn't care...

activatorf1

What is a Toasty ?

MikeyFIN

all aluminum as the block only the head is all iron.
An 165-175hp depending if it was a 470 or 470 R

TOASTY

It was me when i was born and was given about 1 month to live. So the Doc said lets try mushed up burnt to a crisp toast to feed me. After a long battle and the nick name toasty i am here today.

ITs also the name of my sutphen

How you making out Larry? i bought a new phone and need to update #s

Bill88

From original sales/spec sheet 24 had two engine options
twin 165s rated at 52mph
twin 188s rated at 57mph
188's are 302 Fords

Bill88

From original sales/spec sheet 24 had two engine options
twin 165s rated at 52 mph
twin 188s rated at 57 mph
twin 188s are 302 Fords