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Piston to valve clearance

5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

Piston to valve clearance

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Old 07-20-2006, 10:25 AM
  #1  
85bruiser
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Default Piston to valve clearance

with 2.02 intake valves, what's around the maximum lift i could go with the stock pistons? and If i'd have to get aftermarkets, what's a good brand for keeping the stock compression and clearing the valves?
Thanks
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Old 07-20-2006, 01:20 PM
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hellas85stang
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Default RE: Piston to valve clearance

if u have stock pistons 202 is usually to big unless u fly cut them..(notch) for valves....aftermarket is good to size up compression...match to cc...u can do piston to valve clearence test with play doh...easy////measure with feeler gaugeu need as a rule of thumb..100th thousand an inch clearence///pm or email me and i can tell u better..
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Old 07-20-2006, 01:33 PM
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aode08
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Default RE: Piston to valve clearance

its alot better to just do this, and trust me on this.




Take the engine out the car.

Tear down to the block, take all pieces including flywheel assembly to the machine shop with some new aftermarket notched pistons that are .30 over with reliefs for 2.02 valves.

Have the machine shop bore and hone finish block .30 over, polish crankshaft, and instal the pistons, rings and bearings you bought and balance. $400 labor. $180 FOR PISTONS and bearings. Take that beuatiful shortblock back home and play



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Old 07-20-2006, 01:40 PM
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mrbigshot
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Default RE: Piston to valve clearance

is your motor a 85? if so your screwed. the 85's didnt have any valve reliefs so you need to change pistons if you want to go with bigger valves with the stock cam or stock heads with a bigger cam.
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Old 07-20-2006, 02:17 PM
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WLingle92lx
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Default RE: Piston to valve clearance

trickflow is the head with a 2.02 valve that you don't need to notch your pistons. Anyother head and you will need to do so.

BTW: you can run up to .550 lift with the stock pistons before you need to notch them.
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Old 07-20-2006, 03:25 PM
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85bruiser
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Default RE: Piston to valve clearance

Thanks for the help guys.
One Problem.....
I'm in Aghanistan as an army contractor, and my buddy back home is rebuilding the engine. It's out of the car and he just got the parts in yesterday. I ordered the Windsor Sr. Heads because of their higher RPM range and because the World Products Home Page states that they "operate with stock pistons" yeah i've got the 85 engine, and crap i'll probably have to order new pistons. My friend "Dan" is doing the clearance test with the playdoh right now. Can the stock pistons be notched enough to clear the valves?
i ordered a lunati cam with .500 intake and .512 exhaust with 1.6 promagnum roller rockers. Now i'm a bit worried. Oh well it might be time to break open the credit card again.....
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Old 07-20-2006, 03:44 PM
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ZachW04Stang
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Default RE: Piston to valve clearance


ORIGINAL: mrbigshot

is your motor a 85? if so your screwed. the 85's didnt have any valve reliefs so you need to change pistons if you want to go with bigger valves with the stock cam or stock heads with a bigger cam.
85 mustangs have notched pistons. Only the non ho v8's and the 86 302 don't have valve reliefs.
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Old 07-20-2006, 03:51 PM
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mrbigshot
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Default RE: Piston to valve clearance

thank you, i thought it was 85 they did it in when they used the added compression to go from the 177hp 84 5.0 to the 205hp 5.0 in the 1985 models.

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Old 07-20-2006, 03:56 PM
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mrbigshot
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Default RE: Piston to valve clearance

ok i found somthing at world for you. according to there tests the world heads will with stock pistons with a maximum cam spec of .530 lift 290 duration a long as the heads are 61cc and not the 58cc.
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Old 07-20-2006, 04:00 PM
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hellas85stang
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Default RE: Piston to valve clearance

srs are good with 302 strokers or 351w n windsor strokers ..they have 200c runners and i have had and freinds have had 200s on 302s and there a lil slucish off line...with a moded 302 id put jrs/// freind runs 11s with jrs/// and as far as the topic.. its cheaper to check like i said b4 u fork over $ use a lil knowledge and u can get by cheaper..its not allwasy cheaper to have som1 else doit..and may be unessasary...i can check piston to valve clearenc with 3$ and can be done with motor in car///and if its a 85 there are no valve reliefs///so 202 wont work... usually... if u check first ucan see what clearence u have b4 u but things u dont need//
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