The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 47-59 VIN & Block Numbers

geezer#99 · 09-30-2022, 06:21 PM

A whistle only gets tdc in the general area of true tdc. You could be Like about 20 degrees off.
You need a piston stop to be accurate.
One like this.

https://www.summitracing.com/parts/s...SABEgLY_vD_BwE

09-30-2022, 06:21 PM	#11
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,787	Re: VIN & Block Numbers A whistle only gets tdc in the general area of true tdc. You could be Like about 20 degrees off. You need a piston stop to be accurate. One like this. https://www.summitracing.com/parts/s...SABEgLY_vD_BwE