Moving the 243 with this cam
03-07-2017, 11:03 AM
#1
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Moving the 243 with this cam [QUOTE=SHAREEF SALEH]I have ls1 5.7
243 heads
cam with these numbers
13045r/13047r
HR 113+2
W7065-11
which i belive will give me 231/235 .634
titanum double springs
Rockers 1.8 ratio
i am planning to use .04 gaskit
how much i can mill the heads
and what is the size of pushrods to use ??
i do appriate your valuable info
243 heads
cam with these numbers
13045r/13047r
HR 113+2
W7065-11
which i belive will give me 231/235 .634
titanum double springs
Rockers 1.8 ratio
i am planning to use .04 gaskit
how much i can mill the heads
and what is the size of pushrods to use ??
i do appriate your valuable info
03-08-2017, 08:44 AM
#2
Stock valves?
I'd test assemble it first and check PtV clearance. With the thinner gasket it'll reduce your clearance a bit. But a 231 intake on a 111 should still give you a little room. If you are at .060 or so intake and .100 or so exhaust, I'd just leave it alone. But if you have more room than that say .80 and .120, you could take .020 off and bump compression a good bit. That would bring the head down to 61cc and would be very close to 11.5:1 CR which would work well with that cam.
But again, I'd mock it up, torque down the head bolts around the piston you check clearance on and measure. I'd do it at least on one cylinder on both sides to account for any slop in the engine deck or head variance. If it comes out real close, you might want to check all 8 cylinders.
Should be a really nice combo.
I'd test assemble it first and check PtV clearance. With the thinner gasket it'll reduce your clearance a bit. But a 231 intake on a 111 should still give you a little room. If you are at .060 or so intake and .100 or so exhaust, I'd just leave it alone. But if you have more room than that say .80 and .120, you could take .020 off and bump compression a good bit. That would bring the head down to 61cc and would be very close to 11.5:1 CR which would work well with that cam.
But again, I'd mock it up, torque down the head bolts around the piston you check clearance on and measure. I'd do it at least on one cylinder on both sides to account for any slop in the engine deck or head variance. If it comes out real close, you might want to check all 8 cylinders.
Should be a really nice combo.