boggero Posted February 27, 2012 Share Posted February 27, 2012 (edited) Since i got tired of my stock 350, and a friend of mine sold me a cheap pair of vortec heads, so i wanted to ask about this combo i just bought . What do you guys think? Here are the stuff i bought, should arrive next week. The cam is a swap 4 - 7 from Comp cams, the specs are Valve Lift @ 1.5: .490 in. 490 exh Range from 1800 - 6000 rpm Duration adv In 274° adv ex 286° At. 50" in 230 ex. 236 http://www.ebay.com/itm/270728494333?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_3198wt_905 Also i bought two sets of self align rockers 1.5 and 1.6 , Does it makes any difference if i use the 1.6 with new valve springs? http://www.ebay.com/itm/370483993362?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_5104wt_1396 I bought these lifters also, i don't know if they make a difference but i'm going to try them DELPHI ANTI PUMP- UP LIFTERS anyone has used them? http://www.ebay.com/itm/370573479358?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649#ht_3320wt_1396 Edited February 28, 2012 by boggero Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted February 29, 2012 Share Posted February 29, 2012 (edited) as always you need to verify clearances, and valve train geometry, not just assemble parts youll generally find that 1.6:1 ratio rockers provide more power on the intakes that on the exhaust but you can of course use them on both. stock vortec heads usually limit lift to about .480, so check don,t guess at your engines clearances and valve train geometry read the linked info it will help a good deal http://forum.grumpysperformance.com/viewtopic.php?f=52&t=181 http://forum.grumpysperformance.com/viewtopic.php?f=52&t=401 http://forum.grumpysperformance.com/viewtopic.php?f=52&t=5931 http://forum.grumpysperformance.com/viewtopic.php?f=52&t=198&p=233&hilit=ratio+rockers+louis#p233 Edited February 29, 2012 by grumpyvette Quote Link to comment Share on other sites More sharing options...
boggero Posted February 29, 2012 Author Share Posted February 29, 2012 as always you need to verify clearances, and valve train geometry, not just assemble parts youll generally find that 1.6:1 ratio rockers provide more power on the intakes that on the exhaust but you can of course use them on both. stock vortec heads usually limit lift to about .480, so check don,t guess at your engines clearances and valve train geometry read the linked info it will help a good deal http://forum.grumpysperformance.com/viewtopic.php?f=52&t=181 http://forum.grumpysperformance.com/viewtopic.php?f=52&t=401 http://forum.grumpysperformance.com/viewtopic.php?f=52&t=5931 http://forum.grumpysperformance.com/viewtopic.php?f=52&t=198&p=233&hilit=ratio+rockers+louis#p233 Thanks grumpy! im going to read all the links, a shop is going to do the build , and he knows a lot about this, so i should keep the 1.6 and buy the stuff needed to do this? it makes a significant difference in the power of the engine? Quote Link to comment Share on other sites More sharing options...
boggero Posted March 12, 2012 Author Share Posted March 12, 2012 seems that the guy that sold me the heads had a similar combo, the geometry is perfect with 1.6 rockers its almost done! Quote Link to comment Share on other sites More sharing options...
Pyro Posted March 24, 2012 Share Posted March 24, 2012 1.6's are the "easy fix" for a cam with low lift. They especially make a difference on a stock cams. Otherwise, if the cam already is ground with a lot of lift, then adding 1.6's can lead to problems. More lift is not always a good thing as it can wear out springs and cam lobes much faster. Quote Link to comment Share on other sites More sharing options...
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