piston to valve clearance

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Jan 9, 2002 | 06:17 AM

PaveTim

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Joined: Jun 2001

Posts: 296

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From: Hurlburt Field, Florida

Car: 1991 Z-28

Engine: 350 SBC

Transmission: Probuilt 700R-4

piston to valve clearance

I am running a ZZ4 short block with trick flow heads. Now I only have a .015 inch head gasket and was gonna run a cam with maximum .503 lift. I think it will be ok, but you guys think my piston to valve clearance is fine?

Jan 9, 2002 | 09:59 AM

jcb999

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Joined: Aug 1999

Posts: 1,443

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From: College Station, Tex USA

Car: 89rs

Engine: 400Sb

Transmission: Tremec 3550

duration normally plays a larger role than lift

I think car craft did a test on the ZZ4 motor with Comp cam solid roller. It had like 242 degrees duration at .050" and .560 lift... i think it was still using the stock ZZ4 pistons but valve clearance was near the lower limit.

Jan 9, 2002 | 12:00 PM

a73camaro

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Joined: Jan 2001

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From: Denver, CO

Best to measure it. Do this when your degreeing in your cam.

Jan 9, 2002 | 05:50 PM

Matt87GTA

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Joined: Mar 2001

Posts: 2,047

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From: The State of Hockey

Car: 1987 Trans Am GTA

Engine: Miniram'd 383, 24X LS1 PCM

Transmission: TH700R4, 4200 stall

Axle/Gears: 9", 4.33:1

Best to measure for piece of mind, but you are going to be fine, IMO.

Jan 9, 2002 | 06:55 PM

ede

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Joined: Aug 1999

Posts: 14,811

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From: Jackson County

be best to measure it, i do it without the gasket in place. from what i've saw you won't have a problem with flat tops untill you get over .600 lift, maybe even closer to .650.