Are these stock pistons?
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From: Chickamauga, GA
Car: 89 IROC-Z
Engine: 355ci SBC
Transmission: TH700R4 - 2500 stall
Axle/Gears: 3.70 9 bolt
Are these stock pistons?
I pulled my engine, 89 L98 350, along with the trans... In order to get my transmission rebuilt. So I decided to remove all the emissions hardware and install some headers. Well... as I removed the manifolds I snapped two bolts off into the head. Yay... so I pulled the heads so I could drill and extract the bolts at work.
Anyway I don't remember my other L98 having 4 valve reliefs like these pistons do. These are dished but they don't look familiar to me... are these stock? The head gaskets were Fel pro so that tells me this motor has been gone through at some point. It's really clean inside and everything looks great. So I'm going to toss in a LT4 hot cam, valve springs and new gaskets while leaving the rest the way it is....
Anyway I don't remember my other L98 having 4 valve reliefs like these pistons do. These are dished but they don't look familiar to me... are these stock? The head gaskets were Fel pro so that tells me this motor has been gone through at some point. It's really clean inside and everything looks great. So I'm going to toss in a LT4 hot cam, valve springs and new gaskets while leaving the rest the way it is....
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Joined: Jul 1999
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From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Re: Are these stock pistons?
The look like a stock piston or a stock replacement piston. Clean the tops off to see if there's an 030 stamped into them to suggest an overbore
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Joined: Mar 2013
Posts: 325
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From: gladstone
Car: 72 nova/ 90 camaro rs,04 suburban
Engine: blown 327/ 355/306/355/5.3
Transmission: muncie 4 speed/T5/powerglide,4l80e
Axle/Gears: 342/411/456/ moser axles
Re: Are these stock pistons?
you could also take a micrometer and measure the cylinder bore if it is 4.00" or somewhat close to that then its stock
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