LT 1 350 valve to piston clearance

Kdw1403 · 01-01-2017, 12:41 PM

What is minumun valve to piston clearance? i have .100 on intake and .60 on exhaust. I am a little nervous about exhaust side. Is it legal to cut the exhaust valve pocket on the piston just a little? nhra stocker

Bob Gullett · 01-01-2017, 01:14 PM

Is that checked with checker springs or the regular springs?

Kdw1403 · 01-02-2017, 01:44 AM

Quote:

Originally Posted by Bob Gullett

Is that checked with checker springs or the regular springs?

It was with checker spring. I have since used my regular spring and it reads .080 with everything just like i am going to run it in the motor.I am new to stock. I raced super gas for years. Just dont know how far you guys push the envelope in stock eliminator.

Bob Gullett · 01-02-2017, 10:30 AM

Quote:

Originally Posted by Kdw1403

It was with checker spring. I have since used my regular spring and it reads .080 with everything just like i am going to run it in the motor.I am new to stock. I raced super gas for years. Just dont know how far you guys push the envelope in stock eliminator.

I figured it would pick up some clearance with regular springs. .080 is quite adequate.

RichScaz · 01-02-2017, 05:25 PM

Check your PM.

Dan Fahey · 01-01-2017, 01:42 PM

Quote:

Originally Posted by Kdw1403

What is minumun valve to piston clearance? i have .100 on intake and .60 on exhaust. I am a little nervous about exhaust side. Is it legal to cut the exhaust valve pocket on the piston just a little? nhra stocker

I do not think so.
265 55 Chevys sure wish they can notch their flat pistons to get some valve tolerance.

D

Ed Wright · 01-01-2017, 02:10 PM

Quote:

Originally Posted by Dan Fahey

I do not think so.
265 55 Chevys sure wish they can notch their flat pistons to get some valve tolerance.

D

Having raced 265" '55 & '56 Chevies, we damn sure flycut our flat top pistons for valve-to-Piston clearance. Mine was down 4 times by NHRA, three national records & once was protested, passed every time.

MR DERBY CITY · 01-01-2017, 02:29 PM

Quote:

Originally Posted by Ed Wright

Having raced 265" '55 & '56 Chevies, we damn sure flycut our flat top pistons for valve-to-Piston clearance. Mine was down 4 times by NHRA, three national records & once was protested, passed every time.

Ed, we are talking STOCK eliminator.....Alan is correct. I might add just watch yourself in the water....

Ed Wright · 01-01-2017, 03:44 PM

Quote:

Originally Posted by MR DERBY CITY

Ed, we are talking STOCK eliminator.....Alan is correct. I might add just watch yourself in the water....

I apologize. The Stock rules are different enough from when I ran Stock with that '56, I should have kept quite. About all he can do legaly is move the cam.

I don't get the remark about water?

TOSTO RACING · 01-01-2017, 03:55 PM

I think he is referring to don't let it get away from you on a burnout. People tend to over rev a car in the water box.

As for vtp like Alan said above .060 .065 exh would be as tight as I've ever ran and it was okay for me. The intake is more forgiving. if I were you I'd advance the cam and get yourself some more exh clearance and less int in my opinion if you are worried about it .

Good luck with it.

01-01-2017, 12:41 PM	#1
Kdw1403 Member Join Date: Nov 2016 Posts: 205 Likes: 48 Liked 68 Times in 22 Posts	LT 1 350 valve to piston clearance What is minumun valve to piston clearance? i have .100 on intake and .60 on exhaust. I am a little nervous about exhaust side. Is it legal to cut the exhaust valve pocket on the piston just a little? nhra stocker

01-01-2017, 01:14 PM	#2
Bob Gullett VIP Member Join Date: Mar 2002 Posts: 1,104 Likes: 57 Liked 482 Times in 114 Posts	Re: LT 1 350 valve to piston clearance Is that checked with checker springs or the regular springs? __________________ 68 Chevy11 327 F/S

01-02-2017, 05:25 PM	#5
RichScaz Junior Member Join Date: Sep 2016 Posts: 4 Likes: 0 Liked 0 Times in 0 Posts	Re: LT 1 350 valve to piston clearance Check your PM.

01-01-2017, 03:55 PM	#10
TOSTO RACING Senior Member Join Date: May 2007 Location: DRAGSTRIP Posts: 884 Likes: 882 Liked 639 Times in 182 Posts	Re: LT 1 350 valve to piston clearance I think he is referring to don't let it get away from you on a burnout. People tend to over rev a car in the water box. As for vtp like Alan said above .060 .065 exh would be as tight as I've ever ran and it was okay for me. The intake is more forgiving. if I were you I'd advance the cam and get yourself some more exh clearance and less int in my opinion if you are worried about it . Good luck with it. __________________ 5664 GHI/SA 1985 CAMARO RED H/SA 1985 CAMARO BLUE I/SA