i know it`s a bit of topic,but i got cheap mercruiser hydraulic roller cam and lifters.i mean real cheap.however,i don`t know anything about the cam except it cames from mark 5 engine.part numbers are 2296 and 6036 stamped in rear of the cam.does anyone know the lift,duration etc.or where i can find them out?any help would be greatly appreciated.planning to use the cam in my tow wehicle for my -66 ss hardtop chevelle tube chassis race car.

Don't marine engines run backwards? or one of them run backwards when used in tandem?

It depends on the application. In most boats it is the drive or gear box that counter rotates. It could be out of a 500 HP. Do you know anything about what it came out of?

Originally posted by dart468:
i know it`s a bit of topic,but i got cheap mercruiser hydraulic roller cam and lifters.i mean real cheap.however,i don`t know anything about the cam except it cames from mark 5 engine.part numbers are 2296 and 6036 stamped in rear of the cam.does anyone know the lift,duration etc.or where i can find them out?any help would be greatly appreciated.planning to use the cam in my tow wehicle for my -66 ss hardtop chevelle tube chassis race car. Yes....
Let me check my numbers, I can help you with this

Be careful. Some marine engines are reverse rotation.

i think it`s a single engine set-up where the cam comes from and all marine engines i`ve took apart had normal cams.my buddy runs a marine hyd.roller in his 509 bbc.at least the distributor spins the right direction.would be ever so grateful for specs!

Dart468,
That cam is a standard rotation piece from a 454 oval port Mercruiser Gen VI marine engine. Merc Part #431-580478, Chevrolet part #12552296. Chevrolet rates the cam as follows:
204*/209* @ .050 with
.480"/.483" lift valve
.282"/.284" lifter
The actual measured specs are as follows:
280*/299* @ .004
266*/284* @ .006
236*/244* @ .020
206*/211* @ .050
113*/114* @ .200
115.5* ICL
120.5* ECL
118* LSA
If you need any further information you can reach me at
MarineKinetics@aol.com
Bob

Dart468,
That same cam is used in the HT 502 Chevrolet engine and is ideal for towing. In that package it makes 512 lbs/ft torque @ 2800 rpm.
Bob

I remember way back in 1982 when Ford came out with their hot new Mustang GT, it had a marine cam. I remember specifically it was avertised as having a "hot marine cam". That little mustang ran good for it's day. I waited on the 83 model before buying because the 82 only had a little 2 barrel carb. The 83 had a 4 barrel and some other goodies but I don't know if it had a marine cam or not. I won a lot of races with that little stang. OK, that was off subject but couldn't resist sharing the memories!

That is probable the merc 454, 330HP cam

thank you to every one about very valuable information.the cam is exactly what i hoped for!!

I think you can still buy 454HO and 502HO hy-roller new, take-out cams from Competition Products for like $40 or so..

They are in the 220 to 224 degrees at .050" and .500" lift range if not mistaken..

May be two better, inexpensive, stock cams to consider if you want a schosh more power and I figure they will still make great midrange grunt, but just not so much RIGHT off idle as the Marine cam..

pdq67

you guys are great.this site is my "secret weapon"in racing and performance.very few here in finland know how much knowledge and experience you guys have.thanks again.when my 1966 ss malibu is raced in summer i will be representing team chevelle.