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  #16 (permalink)  
Old 01-21-2011, 09:55 AM
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Valve train

You can use the same set up that I have on my 1991 Chevy 4.3L V6 engine. I research the set up with my engine builder extensively and it works as I expected. My camshaft is a Comp Cams roller tappet with .500" valve lift.

VALVES:
Ferrea F5001, 1.94" intake (intake valve seats seldom erode)
Ferrea F5005, 1.60" exhaust (larger exhaust valves will have new seats)
www.daymotorsports.com ($8/$9 each) undercut stems, stainless steel, 4.910" long with .256" tip.
Note: I assembled one set of heads with 2.02" intake valves but did not use them. I decided the increased intake flow is not necessary below 5500 RPM. Larger intake valves require combustion chamber unshrouding to be effective.

VALVE SPRINGS:
Comp Cams 26981-16 beehive-ovate, 110# @ 1.700", 288# @ .511" lift
lower diameter: 2.400" OD, upper diameter:1.065" OD. Moderate spring rate such as these is for a high performance daily driver using no-lead gasoline.

RETAINERS:
Comp Cams 795-16, 10 degree, for beehive springs.

LOCKS:
Comp Cams 614-16, 10 degree, +.050", use with .060" spring seat locators

SPRING LOCATORS:
Comp Cams 4693-16, .060" thick

PUSHRODS:
Comp Cams 7949-16, 7.300", .080" wall, chromemoly, 5/16" OD, +.010" long. Hydraulic lifter preload adjustment will compensate for up to +/- .050" pushrod length. When using solid roller or solid flat tappet lifters the pushrods must be dead-nuts on.


NOTE: Comp Cams 503-16 valve seals, .530" OD guide, positive stop teflon along with K-line Bronze Bullet phosphor-bronze valve guide liners. Max. stem clearances: .0015" intake, .002" exhaust. Ferrea valve stems do not have groove for O-rings seals therefore it is necessary that positive stop teflon (or viton) seals be used. Virtually no oil gets past those seals. They are "self-lubricating".

Last edited by MouseFink; 01-21-2011 at 10:06 AM. Reason: typo
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Old 01-21-2011, 02:26 PM
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Quote:
Originally Posted by F-BIRD'88
What does it say on the cam card for installed/seat and open spring pressure?
Calls for 26981 Beehive.
Install Ht.= 110Lbs. @1.700", Open= 292Lbs @1.175", Rate= 347Lbs.

or 26918 Beehive springs.
Install Ht.= 125Lbs. @1.800", Open= 367Lbs. @1.150", Rate= 372Lbs.
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