I agree that this kind of discussion is vital to build an engine that can sneak up on that competitive edge. Or even just an engine with a mixture of parts to merely survive. Any type of wedge head has to have the correct clearance between the piston and head squish pad. With gasket my preference is.045 to allow for growth. Very important subject to consider!
In printing presses there is flexible sensors available for checking roller clearances, they feed them into the press and roll them back and forth and the strip reports the clearance (often to a fraction of a thou), I wonder if something similar might be possible for testing piston->valve clearance. Though using a dial indicator on the retainer is still probably a better solution
For mildly blown engines with steel rods with = or LESS than .003 rod Bearing clearance .045 is typically the minimum quench gap to minimize quench induced detonation! ... for aluminum rods check with manufacturer.
Thank you for your awesome video content! You help so much. Should I be worried about (Summit stage 3 turbo cam with their spring set) piston to valve clearance on a 5.3l ls with 862 heads and stock dome pistons? As of now non milled heads. 232 intake/234 exhaust with 115 degree lsa.
On an open chamber head the distance doesn’t make the same difference. The 440 Mopar is open except for a couple years , up against a 427 Ford . The Ford must have a tight fit between the two surfaces vs the 440 where they don’t.
Would have to make a educated guess that no Pissing valve clearance not much different compression Ratio flatops always have The little Half Moon clearance for the Valve I've had clearance those before
.030-.050 I was thinking -I thought it was .100 but now I understand. I also begin to think about the cam head combo on my friends ls1 and the angles on the valves (am heads) have to allow some additional clearance and it probs has very little ptv way less than .030 guessing. We discussed it quickly last year and you said I just have to measure but he has been running the car for so long we just left it… ls1, ls9 mls hg, tick polluter 2 (nitrous cam), afr heads. Even seeing it work I wouldn’t recommend it. Something really small, a variation would be disastrous.
@@richardholdener1727 I don’t know how it would fit. I can see the heads so I can verify that. The engine was put together a while ago, So I dunno the cam but he sent me a link to a cam card that had those specs. I was like you had to notch the pistons or something he said no I cleaned the stock ls1 pistons and installed them. For the record it has stock gap as well but we only spray 200 at the drag strip pull 3-4 degrees.
I agree that this kind of discussion is vital to build an engine that can sneak up on that competitive edge. Or even just an engine with a mixture of parts to merely survive. Any type of wedge head has to have the correct clearance between the piston and head squish pad. With gasket my preference is.045 to allow for growth. Very important subject to consider!
The dial indicator method is the best, especially useful with compound angle splayed valves.
cool stuff
Richard what's your rule of thumb for valve to cylinder wall clearance
In printing presses there is flexible sensors available for checking roller clearances, they feed them into the press and roll them back and forth and the strip reports the clearance (often to a fraction of a thou), I wonder if something similar might be possible for testing piston->valve clearance.
Though using a dial indicator on the retainer is still probably a better solution
what about increasing head gasket thinkness to give you more clearance
that can be done-but lowers compression
I tried to tell Uncle Squirrel in thee chat that a slight angle mill can make a piston fit just as he says.
05 lq4 dished pistons 10:9:1 compression , 799 head milled .030 with a .048 thick HG- sloppy stage 3 and issues you think?
Happy Easter Lord Holdener
Richard does PTV clearance increase or decrease with going with a stroker or no change?
WHEN GO WITH A STROKER-YOU ALWASY RUN A PISTON WITH A VALVE RELIEF SO P-V IS FIXED
For mildly blown engines with steel rods with = or LESS than .003 rod Bearing clearance .045 is typically the minimum quench gap to minimize quench induced detonation! ... for aluminum rods check with manufacturer.
greater than .003 rod bearing clearance?
@@richardholdener1727 near stock clearance! I.E. .003 or less. Same engine - N/A can have tighter quench!
Thank you for your awesome video content! You help so much. Should I be worried about (Summit stage 3 turbo cam with their spring set) piston to valve clearance on a 5.3l ls with 862 heads and stock dome pistons? As of now non milled heads. 232 intake/234 exhaust with 115 degree lsa.
5.3 - 862 heads with stock valves - sloppy stage 2 - flat top pistons - anything to worry about?
you are good
408 stroker, AFR 230 heads, cam motion stroker king cam and -5.8 flat top pistons… clearance issues?
Valve Reliefs?...and you need to measure
Yes valve reliefs for 15 degree heads
cool
What about flow, closet or further from valve short turn radiis on slight dome piston?
unsure about question
what about vvt ?
What I want to know is will I have P to V clearance issues in a flat top (no valve reliefs) LS2 6.0 with a factory LS7 cam with L92 heads?
no-you are fine-that cam is very mild
On an open chamber head the distance doesn’t make the same difference. The 440 Mopar is open except for a couple years , up against a 427 Ford . The Ford must have a tight fit between the two surfaces vs the 440 where they don’t.
Would have to make a educated guess that no Pissing valve clearance not much different compression Ratio flatops always have The little Half Moon clearance for the Valve I've had clearance those before
2010 6.0 LZ1 stock flat top pistons 10.7 compression with stock 799 heads. Will sloppy stage 3 work?
yes
.030-.050 I was thinking -I thought it was .100 but now I understand. I also begin to think about the cam head combo on my friends ls1 and the angles on the valves (am heads) have to allow some additional clearance and it probs has very little ptv way less than .030 guessing. We discussed it quickly last year and you said I just have to measure but he has been running the car for so long we just left it… ls1, ls9 mls hg, tick polluter 2 (nitrous cam), afr heads. Even seeing it work I wouldn’t recommend it. Something really small, a variation would be disastrous.
Tick Performance Polluter V1 Classic Camshaft for LS1 & LS6 Engines
242/244 | .61x”/.61x” | LSA112. The heads are 205cc “mongoose” afr.
a 242 cam fit stock p-v? seems suspect
@@richardholdener1727 I don’t know how it would fit. I can see the heads so I can verify that. The engine was put together a while ago, So I dunno the cam but he sent me a link to a cam card that had those specs. I was like you had to notch the pistons or something he said no I cleaned the stock ls1 pistons and installed them. For the record it has stock gap as well but we only spray 200 at the drag strip pull 3-4 degrees.
I'm going to say no. Because it should but why would the dish be added if there was enough clearance already?
To lower static compression..
Yeah to lower compression
05 lq4 dished pistons 10:9:1 compression , 799 head milled .030 with a .048 thick HG- sloppy stage 3 and issues you think?
I would check