this specs is what buick gave nhra for 1972. i know for 73 buicks, buick fibbed to nhra about certain specs. NHRA Technical Specifications For 1972 Buick Motors ROD BORE STROKE DISPLACEMENT CYLINDERS LENGTH 3.800 3.850 350 8 6.387 4.313 3.900 455 8 6.607 5/1/2008 Issued: Feb 25, 1972 Revised: 1-1-96, 2-24-96, 10-02-01,2-21-03 H.P. Disp. C.R. Ind. Make Model/Transmission Manifold R.R. Lifter Head cc Notes 155 350 10.50 1-2 Roch 2GV-7042143/SM 7042142/AUTO 1238643 1.55 H 50.0 1,5,8 195 350 10.50 1-4 Roch 4MV-7042244/SM 7042244/AUTO 1238647 1.55 H 50.0 2,6,9 225 455 10.50 1-4 Roch 4MV-7042240,940 AUTO ONLY 1239925 1.55 H 59.0 7,10 250 455 10.50 1-4 Roch 4MV-7042243/SM 7042240/AUTO 1239925 1.55 H 59.0 3,7,10 260 455 10.50 1-4 Roch 4MV-7042240,940/AUTO ONLY 1239925 1.55 H 59.0 7,10 270 455 10.50 1-4 Roch 4MV-7042243/SM 7042242/AUTO 1239925 1.55 H 59.0 4,7,10 Notes: 1 Alt carb - 7042842/Auto 2 Alt carb - 7042245/SM, 7042944/Auto 3 Alt carb - 7042940/Auto 4 Alt carb - 7042942/Auto Stage 1 engine 5 Alt manifold - 1238578 6 Alt manifold - 1238586 7 Alt manifold - 1238323 8 Carb sizes - 1686/1250 9 Carb sizes - 1375x2250/1093xAV 10 Carb sizes - 1375x2250/1218xAV Deck Piston Type H.P. Disp. Cl Dish/Dome Ht/Vol Valves Cam Lift Springs Notes 155 350 .010 Dished .075" 17.3cc 1880/1505 392/408 Outer w Damper A 195 350 .010 Dished .075" 17.3cc 1880/1505 392/408 Outer w Damper 225 455 .010 Dished .140” 28.7cc 2005/ 1630 397/466 Outer w Damper 250 455 .010 Dished .140" 28.7cc 2005/1630 397/466 Outer w Damper 260 455 .010 Dished .140" 28.7cc 2130/1755 430/468 Outer w Damper 270 455 .010 Dished .140" 28.7cc 2130/1755 490/490 Outer w Damper A = If TRW L2343 or Sealed Power 2232P piston is used the legal dish spec will change from .075" to .070". Head H.P. Disp. Gasket Cast 155 350 .041 1238145,1242145,1242556 195 350 .041 1238145,1242145,1242556 225 455 .041 1238148,1242445 250 455 .041 1238148,1242445 260 455 .041 1238148,1242445 270 455 .041 1238148,1242445,1242455
I was thinking something like 189* IN/198* EX @.050", something less than .400" lift. Then did the E-Bay search and came up with all this info. Probably not exact but it gives an idea that it sure wasn't much and the 76-81 goes off the deep end(assuming it is for a Buick 350). Also found the early GM cam for sale, no specs but interesting. https://www.ebay.com/itm/Buick-350-...843035&hash=item2ea3872363:g:MhYAAOSwFSxZ8kkq https://www.ebay.com/itm/Buick-350-...798833&hash=item2cdf1d250d:g:MhYAAOSwFSxZ8kkq https://www.ebay.com/itm/76-81-Buick-350-5-7L-Hydraulic-Cam-CAMSHAFT-LIFTERS/272281709976?_trkparms=ispr=1&hash=item3f65412d98:g:nCYAAOSwEeFVHsiD&enc=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&checksum=2722817099762a6f763cae06466f81c42089d9eaa5c0 https://www.ebay.com/itm/NOS-REAL-GM-1968-72-BUICK-OLDS-350-ORG-CAMSHAFT-1237736-SKYLARK-GS-CUTLASS-W31/17415107547epid=2286169042&hash=item288c368696:g:E5IAAOSw9MFeF64O
