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
1960 270 H P lifter adjustment
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Re: 1960 270 H P lifter adjustment
In the Sticky above....
30-30 SB SOLID LIFTER CAM VALVE ADJUSTMENT.pdf- Top
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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 20220329_181716.jpg- Top
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Re: 1960 270 H P lifter adjustment
Sound right and a safe easy method for the TRW TP113?
Tks. Doug- Top
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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- Top
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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
Appreciate your help and knowledge on these things.
Doug- Top
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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
Tks. Doug 20220329_181716.jpgLast edited by Douglas C.; April 1, 2022, 04:13 PM.- Top
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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- Top
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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- Top
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