1960 270 H P lifter adjustment

[Douglas C.]

I know there are old write ups for this, Duke Williams and John Z. Is there any updates or changes on this and where on this site can I print it out. Would like to set them cold. Tks. Doug

[Duke W.]

Re: 1960 270 H P lifter adjustment

Nothing has changed since the 9/08 revision. Make sure that's the one you have and use.

Duke

[Douglas C.]

Re: 1960 270 H P lifter adjustment

Nothing has changed since the 9/08 revision. Make sure that's the one you have and use.

Duke

Thanks Duke, I'll look for that version.

Doug

[Richard M.]

Re: 1960 270 H P lifter adjustment

In the Sticky above....

30-30 SB SOLID LIFTER CAM VALVE ADJUSTMENT.pdf

[Douglas C.]

Re: 1960 270 H P lifter adjustment

Thanks Duke, I'll look for that version.

Doug

I now have your revised write up. See as cam my friend had installed years ago slightly different than the 097. Would adjustment procedure still hold true to your every 90 degrees and .010 / .016 cold.

Tks. Doug 20220329_181716.jpg

[Douglas C.]

Re: 1960 270 H P lifter adjustment

I now have your revised write up. See as cam my friend had installed years ago slightly different than the 097. Would adjustment procedure still hold true to your every 90 degrees and .010 / .016 cold.

Tks. Doug [ATTACH=CONFIG]111028[/ATTACH]

Maybe I answered my own question by rereading Duke's paper. The 097 cam, and the TRW TP-113 I am working with can be adjusted at TDC compression for each cylinder's intake and exhaust. TDC #1 Intake & Exhaust, then 90 degrees turn to TDC # 8, etc.

Sound right and a safe easy method for the TRW TP113?

Tks. Doug

[Duke W.]

Re: 1960 270 H P lifter adjustment

The TRW TP-113 was manufactured IAW the GM 3736098/7 drawings. As I said in the paper you can adjust Duntov cam inlets at 90 ATC and exhaust at 90 BTC of the compression stroke, which is REQUIRED for the 30-30 and LT-1 cams to ensure that the lifter is on the base circle, or you can adjust both valves at TDC of the compression stroke of each cylinder.

The smaller recommended clearances are due to the fact that the lash point rocker ratio is LESS than 1.5:1 as explained in the paper.

Duke

[Douglas C.]

Re: 1960 270 H P lifter adjustment

The TRW TP-113 was manufactured IAW the GM 3736098/7 drawings. As I said in the paper you can adjust Duntov cam inlets at 90 ATC and exhaust at 90 BTC of the compression stroke, which is REQUIRED for the 30-30 and LT-1 cams to ensure that the lifter is on the base circle, or you can adjust both valves at TDC of the compression stroke of each cylinder.

The smaller recommended clearances are due to the fact that the lash point rocker ratio is LESS than 1.5:1 as explained in the paper.

Duke

Thanks Duke. I'll start by confirming TDC with my piston stop tool, then mark balancer with four dots, 90 degrees apart. Then adjust both valves at each cylinder TDC compression in firing order.

Appreciate your help and knowledge on these things.

Doug

[Douglas C.]

Re: 1960 270 H P lifter adjustment

The TRW TP-113 was manufactured IAW the GM 3736098/7 drawings. As I said in the paper you can adjust Duntov cam inlets at 90 ATC and exhaust at 90 BTC of the compression stroke, which is REQUIRED for the 30-30 and LT-1 cams to ensure that the lifter is on the base circle, or you can adjust both valves at TDC of the compression stroke of each cylinder.

The smaller recommended clearances are due to the fact that the lash point rocker ratio is LESS than 1.5:1 as explained in the paper.

Duke

Since the owner is concerned this car may have cam lobe damage, after valve adjustment I will try to check the cam lift. If using a dial gauge would it be best to check rocker tip at spring or push rod side. I should add the intake .387 should be the spring side and assume the 1.5 rocker ratio should show around .258 at push rod side. Although I don't doubt Duke's statement the ratio is really 1.37. Thoughts?

Tks. Doug 20220329_181716.jpg

[Duke W.]

Re: 1960 270 H P lifter adjustment

You should check lobe lift on the pushrod side of the rocker. You also might be able to check by loosening the rocker nut, rotating it to the side and placing the dial indicator directly on the pushrod. The rocker ratio starts at about 1.37:1 and peaks at 1.44:1 at max lift with about a 0.3" lobe.IIRC Duntov cam gross lobe lifts are .2625/.2665". Verify with a service manual or AMA specs.

Duke

[Douglas C.]

Re: 1960 270 H P lifter adjustment

You should check lobe lift on the pushrod side of the rocker. You also might be able to check by loosening the rocker nut, rotating it to the side and placing the dial indicator directly on the pushrod. The rocker ratio starts at about 1.37:1 and peaks at 1.44:1 at max lift with about a 0.3" lobe.IIRC Duntov cam gross lobe lifts are .2625/.2665". Verify with a service manual or AMA specs.

Duke

Thanks Duke.