I need help on choosing cam kit

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I need help on choosing cam kit

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Blazer Forum >> Mechanical & Maintenance >> General Tech Help >> 2nd Gen (1995-2005) Tech >> I need help on choosing cam kit

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I need help on choosing cam kit - 9/18/2008 9:16:15 AM

95blazer4wd

Posts: 4
Joined: 9/16/2008
Status: offline

I have a 95 4.3L vin "W" and was looking to rebuild. Since Im doing a rebuild, I thought a cam kit might not be a bad idea. I dont really want to have to mess with anything else such as the computor but want to get as much bang for my buck as possible.
Any ideas???

Post #: 1

RE: I need help on choosing cam kit - 9/18/2008 8:38:08 PM

Duntov

Posts: 194
Joined: 2/29/2008
Status: offline

Use a GM replacement cam and GM roller lifters to make power up to 5000 RPM. Low end torque will be hurt very little.
Camshaft: GM-10051147 (hyd. roller )
Spec.: 222 deg. @ .050" lifter rise, .447" valve lift, 114 deg. LCA
Valve springs: GM-10134358  ( 1.273" O.D. - need 12 )
Spec.: Seat pressure: 110 lb. @ 1.700", coil bind: 1.160", open pressure at .447" valve lift: 269 lb.
Retainers: GM-14003974 ( need 12 )
Pushrods: GM-10134309 ( hardened for guide plates -.075" wall, need 12)
Save some money and clean and reuse your old lifters.
You should machine the stud boss and tap the heads for 3/8"-24 screw-in rocker studs to use with that cam and valve springs.
Rocker stud: GM-12495497 ( 3/8"-24 adjustment threads - 7/16"-14 lower threads )
Guide plates: GM-14011051 ( need 4 - use on cyl. 1, 2, 5, and 6 )
Distributor gear: GM-10456413 ( .491" dia. dist. shaft )
Just for comparison a regular production cam has .351" (I) and .386" (E) valve lift and is a torquing cam and will lay down about 4000 RPM.

After market cam grinders have not spent much time developing high performance and racing camshafts for the 4.3L V6 engine for obvious reasons.

The GM cam I suggest will preserve what little torque the 4.3L V6 has and it needs all it can get, especially in a heavy vehicle like a Blazer. With that cam, you can use your old GM roller lifters. You will not have to add headers or change to a 3.73 or 4.10 rear end gear ratio in order to get back lost torque by final drive multiplication. Your little GOV-LOC locking differential cannot tolerate much more horsepower that a stock 4.3L V6 engine can develop. A 10-bolt GOV-LOC (G80) locking differential is good up to 280 - 300 HP and any more could break it.

< Message edited by Duntov -- 9/18/2008 8:54:17 PM >

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1991 S10 Blazer 4-dr, auto., 4x4, 4.3L TBI
Competely original. My Blazer even has 1991 air in the spare.

Restored 1963 Pontiac Catalina Sport Coupe, Richmond ST-10 4-speed, 421 H.O., 370 HP tri-power, 3.64:1 Saf-T-Track, HD Police Option

(in reply to 95blazer4wd)

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