416 head selection
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.
Thread Starter
On The Tree
Joined: Jan 2020
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From: Houston, Tx
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.
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.
Thread Starter
On The Tree
Joined: Jan 2020
Posts: 115
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From: Houston, Tx
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.
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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
Thread Starter
On The Tree
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From: Houston, Tx
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.
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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.
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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
best of luck
Jim
Thread Starter
On The Tree
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From: Houston, Tx
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.
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.
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 ?
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On The Tree
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From: Houston, Tx
Originally Posted by 64post
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 ?
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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.
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.
Thread Starter
On The Tree
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From: Houston, Tx
Originally Posted by 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
best of luck
Jim
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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
anywho..... I am hoping you try PatG. Do you have a timetable when you want to have this ordered?
Jim
Thread Starter
On The Tree
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From: Houston, Tx
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.
Thread Starter
On The Tree
Joined: Jan 2020
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From: Houston, Tx
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?
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?