[schwiplarkin]

I'm curious, what king of power gains would you expect using the same cam grind for mechanical to roller?

 

[Lightners]

why would you use the same grind?? I know the question your trying to ask though. The rollers big advantage is the early and late lift #s (basicly how fast it can open and the spring close the valve). To throw out a hp # is not possible without knowing alot of info. Long story short the roller will be better.

 

[mrdragster1970]

.

I was told there was a test & it was ~50 HP. Don't remember the exact deal, but it was a Chevy.
The guy never found the magazine, so I can't vouch for it. I would bet they did plenty of those tests somewhere,
when trying to sell the more expensive piece?? I'm surprised we don't see them on a cam site??

.

 

[Slow 69 SS]

Alot of variables there. As already stated, a properly sized roller will get the valve open sooner and spend more time using the intake ports mid to high flow rates.

This will only see a gain if the cam compliments the flow of the curent head, compression ratio, and of course a upgraded valve train.

Last season I upgraded to an off the shelf roller cam, replacing a custom mechanical grind. I went .30 better in the 1/4. I am not sure if all that gain was the difference between roller VS Mechanical. I think some of it was the POS "Custom" cam.

 

[schwiplarkin]

thanks guys. i'm just trying to make the decision since my motor is back apart, again.

 

[desoto30]

the only time that I did a back to back test (F/T solid - solid roller) IE same engine cam change only on the very first run (from memory) the car ran 2/10th slower & ~ 6 to7 mph faster, but went faster eventually overall. The cams were not identical grinds though.

 

[MCEcomp]

On my dyno i pulled a well developed comp flat tappet cam and replaced it with a comp roller of very similar specs(roller slightly smaller) and engine picked up 25HP peak with 28HP in places and picked up 1.5MPH at the track

 

[schwiplarkin]

thanks again. i ordered the roller setup today.

 

[Lightners]

You will not regret it in the long run...Good luck man