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#44663 10/30/2003 7:57 AM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | I snagged a 3/4 race cam for a decent price to slap in my garaged spare 235. I'm using it to build up a performance platform (cam, 3 small deuce progressive intake, headers) to put in my truck and then get the 261 built even wilder and swap back. Anyway, here are the cam specs:
Chevrolet, 6 cylinder, 235-261ci, racing cam, Wolverine cams, cam box labeled #G-968, also stamped on face of front journal 968 A93M. Mfg catalog states 3/4 race, solid lifters. Specs intake duration 291, exhaust 275, intake lift .279, exhaust .273, intake valve lift .405, exhaust .387, intake clearance .006 hot, exhaust clearance .016 hot.
Obviously I should run solids, but what/where kind of lifters should I get? It's a '58 235 truck block that already has solids.
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#44664 10/30/2003 10:53 AM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | If this is a new or fresh cam, I would definitely run fresh lifters. not much of a difference if they are solid. Rhodes lifters or Isky,, not sure who else makes them now for the 235/261
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#44665 10/30/2003 3:57 PM | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | Get a set of solids from NAPA or Patrick's. Whats strange about this cam is that the intake #s are bigger than the exhaust. Usually the exhaust has bigger lift and dur numbers to help the scavaging effect. And if you hang the intake open longer, you decrease dynamic compression.
hmmm wonder how it'll run?
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#44666 10/30/2003 5:45 PM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | Four, if the cam is steel, you are supposed to use chilled iron lifters, if the cam is cast iron then you can run the typical replacement lifters.At any rate you should run new lifters on the cam.I heard the wrong lifters can chew up a cam quickly.If you have any doubts, contact the cam maker for info, I think Crane bought out Wolverine, check their website. the Howard M4F has about .421 lift at valve and 206 degrees duration at .050 lift. M4F advertised duration is 236 degrees. The advertised lift includes lifter take up clearance ramps and is not a good judge of cam performance.The following is the specs for a stock 261 cam, advertised duration,290 degrees, duration at .050 lift,190,valve lift at intake,.416,valve lift at exhaust,.408 Your cam sounds milder than the stock one, but lobe centers and valve opening rates are probably different. | | |
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