Cam ID

[conn84gn]

I have a roller cam I would like to know it's spec's
It is a 3.8 cam
Original markings 819506 and 97D
Now Dremel marked C3105,C3105, HR107,E7219
I called Comp a while back and they thought it might be equal to 201/201

 

[SCOOBY DOO]

Poston, Erson and Lunati went nowhere. HR 107 goes to Comp cams...link below. You need to talk to Bison or TA Performance or Mike at FT.

https://www.summitracing.com/int/search/part-type/camshaft-kits/make/buick/cam-style/hydraulic-roller-tappet/camshaft-gear-attachment/3-bolt/engine-type/v6?N=engine-type%3Av6

 

[hensleyt]

Comp cam High Energy lobe3105 = 256 duration 200@ .050 lobe lift .310 .480 with 1.55 rocker (stock) found in comp cams lobe book page 18
I would say the HR is Hydraulic roller LS 107
E7219 I think is the customer ID#

 

[hensleyt]

I got more for you
Ex open 27*BBDC close 7* BTDC
In open 7* ATDC. close 27* ABDC
over lap -14*

 

[conn84gn]

So pretty close to a 206/206?

 

[conn84gn]

Looks like a custom grind that will work for my 84 Hot air motor I'm refreshing
Thanks for the information.

 

[hensleyt]

It would work good , often we use more cam than we really need. It looks more like a stock grind slow valve speed should be vary quiet and easy on valve training

 

[conn84gn]

Yea except for the comp sewing machine lifters I have

 

[conn84gn]

I do have the 885 for this build

 

[hensleyt]

Most cams for our cars have fast ramp speeds and high lift this cams lobe looks to be on the conservative side.
I have my own theory about the idle upper end noise. These Buick make 10-20 lb oil pressure at idle along with high spring pressure on the valves. I thing it a case of high bleeding on the lifters.
Ever owned a set of Rhoads lifters ?