318 compression test results
Is my compression numbers ok than or are we waiting for a leak down test to be performed
They look ok for the most part, but I think cylinder #3 has a valve issue... The other cylinders may have some blow-by on the rings since the wet test made them increase about 10 - 15 psi...
The cam I was thinking is .429/444 lift duration 268/276 overlap 44 centerline 114 if I'm correct that's the 340 cam. Or theres this cam .410/.425lift 248/256duration 32overlap 110 degree There both purple hyd cams which one would be best
I would go with the stock 340 cam... .429/444 lift duration 268/276 overlap 44 centerline 114...
Our rule of thumb in the 80's was do not upgrade the cam in an engine with over 100 k on it... We knew a few people that did and ended up throwing a rod/spinning a rod bearing...
If you're going to replace the cam, get the Mancini Racing cam kit B for it with new rings, rod and main bearings, and a complete gasket kit for $205.... Thea
Clevite 77 Engine Kit - 318
However, I'm not sure if their rod bearings have the oil squirt hole in them, so I would ask them to verify or go to summit and get a set of rod bearings with the squirt hole capability to keep the cylinders oiled...
Is my compression numbers ok than or are we waiting for a leak down test to be performed
They look ok for the most part, but I think cylinder #3 has a valve issue... The other cylinders may have some blow-by on the rings since the wet test made them increase about 10 - 15 psi...
The cam I was thinking is .429/444 lift duration 268/276 overlap 44 centerline 114 if I'm correct that's the 340 cam. Or theres this cam .410/.425lift 248/256duration 32overlap 110 degree There both purple hyd cams which one would be best
I would go with the stock 340 cam... .429/444 lift duration 268/276 overlap 44 centerline 114...
Refresh the heads and short block. Then forget it. If you dont you will always have a question mark in the back of your mind when you run the engine. Ask me how I know.
Our rule of thumb in the 80's was do not upgrade the cam in an engine with over 100 k on it... We knew a few people that did and ended up throwing a rod/spinning a rod bearing...
If you're going to replace the cam, get the Mancini Racing cam kit B for it with new rings, rod and main bearings, and a complete gasket kit....
Clevite 77 Engine Kit - 318
However, I'm not sure if their rod bearings have the oil squirt hole in them, so I would ask them to verify or go to summit and get a set of rod bearings with the squirt hole capability to keep the cylinders oiled...
DODGE Sealed Power 2130CP Sealed Power CP-Series Rod Bearings | Summit Racing
I used Oregon Cams grind #226 268/278 adv, 208/220 @.050, 423/441 lift, except I had it ground on 108 LSA instead of 114. Their copy of the 340 automatic cam.
I would keep the 114 lobe center line for the stock 318 compression... It will have less overlap and a little higher cylinder pressures than the 108 LSA...
