Rebuilding 4.3l

[Bergerson]

Ok guys, I need some advice on cam selection for this motor, I have a 90' 19' chaparral I/O with a 4.3l in it, last summer i did a vortec head swap,4bbl carb and elberbrock intake that woke this little motor up tremendiously, well this winter the block cracked from the -15* weather.. Yes i winterized it per instructions from here and have been doing it the same way for 10 years without ever having any problems..

Anyways I picked up a 93 vortec engine out of a 4wd Blazer as it was supossed to have the hot cam and larger valves in it, well as it turns out after i tore it down for inspection i am going to have it rebuilt, bored .30 over and all new internials, I dont want to do this again any time soon. so I would like some advice on the cam, should i go with the factory spec cam for that year blazer which is *
'92-'95, Vin W, w/ balance shaft
- Lift (I/E) - .432/.440
- Dur @ .050 (I/E) - .208/.208
or should i go with something a little hotter? without the risk of inversion?

I am after performance as i use this boat to pull skiers,wakeboarders, and tubers all summer long, sometimes with 6-8 adults on board and need all i can get without doing a v-8 swap. thanks in advance for all the help!

Bryan

 

[HT32BSX115]

Re: Rebuilding 4.3l

well this winter the block cracked from the -15* weather

They don't crack from -15* weather.....Blocks only crack if there's water in there and it freezes......I am not sure that anyone here suggests leaving any water in the block. Sorry to hear that....




8 adults in a 19ft boat? AND pulling skiers?



Your best bet for a cam is to speak to COMP, ISKY or other cam builder for the best choice cam.

If it were me and I wanted to pull skiers with 8 people in the boat..... I would put a 350 V-8 in it.....that's loaded up pretty good.....


Cheers,


Rick

 

[Bergerson]

Re: Rebuilding 4.3l

I agree with everything you said, yes, obviously there was some water left in the block somewhere.. yes sometimes i will have 7 or 8 people on board, usually its 4-5 people. yes a v-8 would be nice but i will buy another boat with a v-8 in it before i spend 5-6k on a new outdrive and a motor swap. I was contimplating the v-8 swap but it is just not doable right now. thanks for the advice.

They don't crack from -15* weather.....Blocks only crack if there's water in there and it freezes......I am not sure that anyone here suggests leaving any water in the block. Sorry to hear that....




8 adults in a 19ft boat? AND pulling skiers?



Your best bet for a cam is to speak to COMP, ISKY or other cam builder for the best choice cam.

If it were me and I wanted to pull skiers with 8 people in the boat..... I would put a 350 V-8 in it.....that's loaded up pretty good.....


Cheers,


Rick

 

[Bergerson]

Re: Rebuilding 4.3l

understood but i need to know what cam to go with, any advice would be greatly appreciated, thanks. I am going to have this motor rebuilt, so a new roller cam is going to be put in. I want to make sure its the right one.

 

[Don S]

Re: Rebuilding 4.3l

I am going to have this motor rebuilt, so a new roller cam is going to be put in. I want to make sure its the right one

OEM comes to mind, anything after that is under the "Try this, it worked for me" category.

 

[fossill]

Re: Rebuilding 4.3l

I'd use an OEM marine cam for that engine