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Need help with camshaft choice!


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4 replies to this topic

#1 o_rod

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Posted 20 April 2018 - 04:27 PM

Hey guys,

I'd like to toss in a new camshaft/lifters/double roller chain as I feel my exisitng cam isn't taking advantage of my current mods and don't know the history of the timing chain.

Going to stay with a hydraulic flat tappet, engine is a 355, 10:1, 461 heads, 4.11 gears, 3500 stall, th350 and a 28" rear tire.

I'd like to shift the power band up a bit to take advantage of my gear and stall. I was looking at the lunati voodoo 60104 or the comp cams big mutha thumpr. These are big aggressive grinds, would it be too much for my double hump heads? any recommendations?

#2 zmanabba

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Posted 20 April 2018 - 11:56 PM

I have had good luck with the Voodoo grinds, albeit in big blocks. The Mutha Thumpr grinds are suited for more show than go. The 60104 is a great cam in the right combo. Unfortunately those heads will probably be holding you back. The engine would run great ( make sure you install the correct springs ) but with a good set of aftermarket heads would be a beast. Personally if you want to stay with the 461's I would run the 60103 grind. Good luck David   



#3 Dans '70 Z20

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Posted 17 May 2018 - 06:40 AM

All I can say is go hydraulic roller if at all possible. 

We have seen way to many cam failures here with flat tappets due to the removal of zinc in commercial oils.  Steve threw a rod through the side of his oil pan after very few miles. Close call on a numbers matching motor.

The zinc is what provides great lubrication on metal to metal contact.  You used to be able to get the diesel oils (still had zinc) but they have also removed the zinc now.  

Zinc was found to destroy catalytic converters, hence the removal.  Since all new cars are hydraulic rollers, no problem right.

 

Play it safe and spend a lil extra, or wait a lil longer, and go hydraulic roller.  You will avoid flat tappet failure and a short term forced rebuild.

Most engine builders still recommend using Racing Oils (that have Zinc, bc for racing/off road use only they can still have it) or to add zinc additive ...... even if your running a hydraulic roller.

 

I have a Crower dual duration cam in mine and very happy with it.  But mine is a big block.  I am sure they have similar available for a small block.

 

Just my two cents.

Dan


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#4 Monteman1971

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Posted 17 May 2018 - 02:11 PM

I agree with Dan...roller is the way to go but I didn't throw a rod..... A lifter literally came apart and the pieces fell into the rotating assembly and was shot out through the oil pan. Missed the block by less than an inch. In any case, stay away from Comp Cams in my opinion (others may disagree), the quality is sub par.

 

Steve


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#5 Leghome

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Posted 17 May 2018 - 04:30 PM

I had an Erson Roller cam and roller tip rockers installed in my 350 2 years ago along with a .0020 bore and flat top pistons. Very happy with my setup.


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