Posted By: gregsdart
Value of larger cam core? - 12/30/21 12:02 PM
From what I hear, read , and experience it looks like I am at the limit of how much can be done with a stock cam core cam.
My combo will be 550 cu inch, 572/13 385cnc heads, 14.5 or higher compression, Jesel 1.7 rockers, methanol injection, ported 3X intake, aluminum BMP Block. Since I will be waiting for pistons and heads, I should find out what benefits a new bigger cam core will provide.
My current cam core has a . 920 base circle and .510 lobe on the intake. Crankshaft is 2.2 rod bearings with 4.315 stroke.
I see . 005 or . 006 lash change around the base circle due to high spring loads when I measured lash all the way around the lobe.
Since I may need ( almost gaurantee'd) longer pushrods I am thinking a larger cam core might change that, allowing re use of what I have.
My block will grow . 011, deck height is . 025 higher, plus the 572/13 heads will be roughly . 060 thicker and the 572 valve gear may also add some length. Tally all that up and I see a need of at least . 100 longer pushrods is quite possible.
M y old combo had iron block 10.695 deck,. 920 cam base circle, 440-1 heads cut over . 060 more than the new heads will be cut. That combo needs 9.80 intake pushrods.
So back to the original question.
What advantage is there to a bigger cam core, and cost? Also is there a special part required to go with the Jesel belt drive?
My combo will be 550 cu inch, 572/13 385cnc heads, 14.5 or higher compression, Jesel 1.7 rockers, methanol injection, ported 3X intake, aluminum BMP Block. Since I will be waiting for pistons and heads, I should find out what benefits a new bigger cam core will provide.
My current cam core has a . 920 base circle and .510 lobe on the intake. Crankshaft is 2.2 rod bearings with 4.315 stroke.
I see . 005 or . 006 lash change around the base circle due to high spring loads when I measured lash all the way around the lobe.
Since I may need ( almost gaurantee'd) longer pushrods I am thinking a larger cam core might change that, allowing re use of what I have.
My block will grow . 011, deck height is . 025 higher, plus the 572/13 heads will be roughly . 060 thicker and the 572 valve gear may also add some length. Tally all that up and I see a need of at least . 100 longer pushrods is quite possible.
M y old combo had iron block 10.695 deck,. 920 cam base circle, 440-1 heads cut over . 060 more than the new heads will be cut. That combo needs 9.80 intake pushrods.
So back to the original question.
What advantage is there to a bigger cam core, and cost? Also is there a special part required to go with the Jesel belt drive?