Che70velle

iTrader: (6)

I did an LS2 with LS3 heads and intake. I used a Mast VVT camshaft that was 220/234 .570 .580 on a 116. #914-201. The engine was a hoot in my heavy 6 speed Chevelle. The beauty of VVT is that it widens or broadens the powerband, effectively making the camshaft act bigger than it actually is. I love the tech.

JKD

So here is a twist to this in the name of getting my Tahoe on the road on a budget. I reuse my AFR210 Mamofied heads 65cc chambers
CR would be in the 10.7 10.8 by my calc.
DCR 8.37
CamMotion 232/238 620/612 115+5
LSXR 102 Mamo matched to heads
2800stall
Some exhaust work to be done as well.
I know this departs from my original plan, but it should be a fairly docile idle with only 5* overlap on a 416.
46 IVC. 6 IVO
59 EVO. -1EVC

This should be a strong motor and have plenty of torque as well.

Thoughts.

Jimbo1367

This should be fun to drive. I like it

JKD

Thanks, I hope so.

DualQuadDave

iTrader: (6)

I would put a touch more converter in it with that 232 cam. Maybe 3200rpm. Just me, but unless I am building a 4x4, it's going to get a 3000+rpm converter even with a bone stock motor LS1/2/3.

JKD

Yeah, I have never been happy with this converter. Not sure if it's programming or what, but it never has stalled up past 1800-2000. Felt mostly like stock to me. I would definitely consider a 3200 if I stay with this cam. I am still researching a VVT cam.

Jimbo1367

IT might be worth the time to e/m Patrick G so get his input on your goals and willingness to try a VVT cam. You could also run the same questions by CamMotion techs too. I know both have experience in doing custom VVT cams

JKD

Jimbo, I spoke with Bob at CM and he supplied me the 224/232 cam spec I am contemplating. He also explained that the VVT motor was weak and couldn't support a spring strong enough for larger cams. This was on 6/30 or this year. I see all these larger cams from TSP and such in the 23x and wasn't sure why he would make that statement. I just figured I would have to go else where and then have CM grind it. As for Pat G., He spec'd the first VVT for my Tahoe 5.3 before I changed engine size. I will go there for a last resort. Not from a negative stand point, but I was looking for other's input before going back to where I had already been, if that makes sense. I like to collect data and see where others have been to make a better informed decision.

Darth_V8r

iTrader: (4)

personally I think that the smaller cam is a better bet for your goals. If you plan to tow, I don't know that I would push the stall too much. A lot of your decision, beyond the size of the truck, are determined by how you plan to use it.

Jimbo1367

I understand your reasoning and agree. How was experience with the PatG VVT cam he apex’s before? If it did what you want? I know everyone’s definition of the same performance will differ. I’m surprised CM gave u that advise. I originally planned on having PatG do a VVT cam for my LY6, But that’s on hold for now. I really like the results pat gets with his ls3 cams. I agree with Darth on not going too big being a truck.

best of luck
Jim

JKD

Thanks for the voice of reason Darth. I agree and this is my mind on the hamster wheel. I have that cam already which is what prompted the question, but would purchase a VVT cam and use my 210 heads if I go this route. Maybe have them opened up a little in the chambers to lower compression and maybe get a 2.05 or 2.08 valve to help feed the 416. Other than that I have applied the brakes on the merry-go-round. Lol.

Darth_V8r

iTrader: (4)

A good rule of thumb for most (>90%) applications is for the intake valve to be about 52% of the bore. So, opening up to a 2.08 would be a good move for sure. If you can get the valve to fit. Given cathedral geometry, it might be difficult, but even a 2.05 valve will be a good move over what is likely a 2.02 in there now.

64post

iTrader: (5)

With the addition of 40ci, why not go with a rec port head? For the amount of money laid out for MMS 235s you could easily buy a set of AFR 260s and have a good chunk left over for rockers or ?

JKD

With the heavy truck and my goals I feel the cathedrals will serve me better. I have looked at the Mast 240cc rec. port heads and will discuss with them later this week the options there. I need bigger chambers to keep the compression in check for now. I think those are 62cc and not sure if they can be adjusted any.

bortous

Stick with the cathedrals.
They make more low and mid range grunt than the square port heads.
The MMS heads will give you the best results possible in the range you want to prioritise.

JKD

I had a great experience with Pat. I will likely go back with him since I can't get much input from others. I do have a couple calls left to make before I'm done searching.

Jimbo1367

Have so seriously checked out TSPs VVT cams? They’re a few “running around here” with them. Try a a SEARCH for real world experience I know Clint aka Bandit has a VVT2 in his LY6.

anywho..... I am hoping you try PatG. Do you have a timetable when you want to have this ordered?

Jim

JKD

Well I dropped my equipment off yesterday and the short block will be ready in a few weeks, opening weekend and all. I really need to make a decision within the next 4-7 days. Needless to say my research is winding to an end.

JKD

As to the TSP stuff, I have looked at it. It looks to me like they are geared to more stock headed cam swap applications. Of course I'm no expert.

JKD

So I've been thinking, what would happen if a cam that looks good for a given rpm range was turned into a VVT camshaft? For instance, the cam I have spec'd for this build. 224/232 116+4
What happens if I just have that ground on a single bolt VVT core? Does it translate that easily? Are we all over thinking this?
Thoughts?