The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - NEW set of 1.6 ratio roller tipped rocker arms.

**crossy** · 06-04-2003, 10:14 PM

1.5 was stock on all small blocks. the 1.6 makes your cam bigger.
it will add .030 lift to a .450 lift cam a few degrees of duration. has nothing to do with CID of engine or heads really. It's a multiplication factor. 1.5 times your LOBE lift or 1.6 try it with 300 lobe lift and you'll see the numbers i just posted . .450 vs. .480 .

then if you take the stock cam of appx. 266 lobe lift and multiply you get the added .025 of lift , stock is appx .400 lift and these will make it .425 with a few added degrees of duration.
on my 305's it added about 400 useable RPM. no bull. DAVE

06-04-2003, 10:14 PM	#3
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,042	1.5 was stock on all small blocks. the 1.6 makes your cam bigger. it will add .030 lift to a .450 lift cam a few degrees of duration. has nothing to do with CID of engine or heads really. It's a multiplication factor. 1.5 times your LOBE lift or 1.6 try it with 300 lobe lift and you'll see the numbers i just posted . .450 vs. .480 . then if you take the stock cam of appx. 266 lobe lift and multiply you get the added .025 of lift , stock is appx .400 lift and these will make it .425 with a few added degrees of duration. on my 305's it added about 400 useable RPM. no bull. DAVE __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww 84,C10 SWB-Yella,stock 86 K10 SWB-Red, hopped up 305,4/S LOTS of Cummins trucks.