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I have a big M and want to bore the cam tunnel out for a 55mm cam and use babbitt bearings. 9.8" deck, 4.250" Lunati crank, GRP 5300 series rods, Cam specs 286 int. 308 [email protected] .050", lobe lift .520" with 1.8 rockers. 114 lsa, .903" lifters with .812" bearing. My question is will the rods clear these lobes with a 55mm cam? I know they clear with a standard BBC core. Any advice is appreciated, thanks.
 

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You should not have any problem with that. We have a BIG M block tall deck with 55mm cam and with some minor clearancing on the rods it clears a 4.75" stroke with steel rods. Our cam has over 0.570" lobe lift.
 

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Have a 10.2 deck big M, with a .540 lobe and a 55mm core, and steel rods with a 4.75 stroke. Had to clearance pan rails for rods, and had to take a decent bit of meat of the rod to clear cam. Good luck
 

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Have a 10.2 deck big M, with a .540 lobe and a 55mm core, and steel rods with a 4.75 stroke. Had to clearance pan rails for rods, and had to take a decent bit of meat of the rod to clear cam. Good luck
Which block and rods are you using?? On our DART block we did not have to grind anything at all and the Oliver rods only needed a light grinding.
 

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Have one with .597 lobe lift and MGP alum rod with 2.200 bearing,no problems.Bill C
you have .597" LOBE lift on a 55mm cam core?
 

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You should be fine. We use a short deck big m. MGP s dedicated nitrous rod with a 1/2 inch 12 point head, 4.250 stroke. The MGP is bigger than the GRP. We use 535 lobe intake 530 exhaust on a 116, 4/7, 5/3 swap
 

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sam, i did one 6 month back with .580 lobes on a 55mm 1.044lift
 

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You should be fine. We use a short deck big m. MGP s dedicated nitrous rod with a 1/2 inch 12 point head, 4.250 stroke. The MGP is bigger than the GRP. We use 535 lobe intake 530 exhaust on a 116, 4/7, 5/3 swap
Thanks for all the feedback guys. This combo looks really close to what I want to do, Is the cam 55mm ?
 

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.580-.600 lobes on 55mm cores? Interesting.... Never heard of that. Definitely isn't a core off anyones shelf.
me either.

IMO a .540-.550 lobe on a 55mm woud be realy big, .580" lobe lift on 55mm core is HUGE.

I mean if it was a 60mm core, not a bi gdeal, but .570-.590 lobes on a 55mm never seen that
 
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