Stroke measurement

Paul Merolla · 10-11-2009, 09:08 AM

I have a feeling this is a stupid question, but I can't seem to figure it out on my own so here goes....how does NHRA measure stroke in teardown? I'm disassembling and measuring the "used but freshened" 327 I bought for my Nova and haven't seen a dial indicator that goes that far. Also, the spec sheets say .002 in the hole and .018 head gasket...sounds a little tight to me. I realize that's a minimum, but how close is too close?

Paul Merolla · 10-11-2009, 09:34 AM

Duh...just answered it for myself: http://www.jegs.com/i/Lunati/638/98900/10002/-1

Kinda pricey, though. Is there a way to do it without that tool?

BlueOval Ralph · 10-11-2009, 09:39 AM

That is used when crank is out of block, PMS make a tool to check from the deck with crank in block.
Ralph

Quote:

Originally Posted by Paul Merolla

Duh...just answered it for myself: http://www.jegs.com/i/Lunati/638/98900/10002/-1

Kinda pricey, though. Is there a way to do it without that tool?

Rory McNeil · 10-11-2009, 02:28 PM

Pretty sure when I tore down before that they just used a 6" caliper.

Tom Meyer · 10-12-2009, 12:02 AM

Been torn down about 20 times, they use a caliper in TDC indicater. Rock it on the bottom of the stroke set to zero then rotate it up you will then have your stroke. They check deck hieght plus gasket as long as you are more than the spec you are ok, I run about 35 on my 283 you may want a little more on the 327. Tom

RJ · 10-12-2009, 04:57 AM

6" caliper

Paul Merolla · 10-12-2009, 08:41 AM

Quote:

Originally Posted by Tom Meyer

Been torn down about 20 times, they use a caliper in TDC indicater. Rock it on the bottom of the stroke set to zero then rotate it up you will then have your stroke. They check deck hieght plus gasket as long as you are more than the spec you are ok, I run about 35 on my 283 you may want a little more on the 327. Tom

Thanks Tom - did you figure out why you kept blowing the tires off?

10-11-2009, 09:08 AM	#1
Paul Merolla Senior Member Join Date: Dec 2001 Location: Papillion, NE Posts: 596 Likes: 194 Liked 232 Times in 57 Posts	Stroke measurement I have a feeling this is a stupid question, but I can't seem to figure it out on my own so here goes....how does NHRA measure stroke in teardown? I'm disassembling and measuring the "used but freshened" 327 I bought for my Nova and haven't seen a dial indicator that goes that far. Also, the spec sheets say .002 in the hole and .018 head gasket...sounds a little tight to me. I realize that's a minimum, but how close is too close?

10-11-2009, 09:34 AM	#2
Paul Merolla Senior Member Join Date: Dec 2001 Location: Papillion, NE Posts: 596 Likes: 194 Liked 232 Times in 57 Posts	Re: Stroke measurement Duh...just answered it for myself: http://www.jegs.com/i/Lunati/638/98900/10002/-1 Kinda pricey, though. Is there a way to do it without that tool?

10-11-2009, 02:28 PM	#4
Rory McNeil VIP Member Join Date: Jun 2007 Location: from Vancouver BC Canada, now in Nova Scotia Posts: 1,257 Likes: 245 Liked 939 Times in 259 Posts	Re: Stroke measurement Pretty sure when I tore down before that they just used a 6" caliper. __________________ NHRA 6390 STK M/S 85 Mustang

10-12-2009, 12:02 AM	#5
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 900 Likes: 51 Liked 301 Times in 105 Posts	Re: Stroke measurement Been torn down about 20 times, they use a caliper in TDC indicater. Rock it on the bottom of the stroke set to zero then rotate it up you will then have your stroke. They check deck hieght plus gasket as long as you are more than the spec you are ok, I run about 35 on my 283 you may want a little more on the 327. Tom __________________ Tom Meyer 5240 SS Stock ???

10-12-2009, 04:57 AM	#6
RJ Member Join Date: Oct 2002 Posts: 248 Likes: 0 Liked 0 Times in 0 Posts	Re: Stroke measurement 6" caliper