datsun327 Posted September 2, 2004 Share Posted September 2, 2004 ive done many search and cant seem to kind a anwser. a friend was telling me that it is better to do 1.7 roller rockers on the exhuast and 1.6 on the intake. now me personally have never heard of this b/c. has anyone heard of this or even tried it. the reason i didnt think it would work is b/c ive never seen a 1.7 rocker for a sbc? Quote Link to comment Share on other sites More sharing options...
Zoldman Posted September 2, 2004 Share Posted September 2, 2004 Very common to go with different ratios to make up for a head/cam flow issue on one side or the other, so this would not be out of the question. Problems come in with extended lift rockers when you lift too much and smack a valve into the piston. You've gotta know what clearances you've got. Over ratio rockers give more lift and because of this, a slightly longer opening/closing time. So, you also gain a very slight increase in duration. IF the motor is getting new heads and such, you're better off sizing your cam to give the lift and duration you want, rather than using rockers to beef up a weak cam. What is your situation with the motor? What is the car used for? Bill Quote Link to comment Share on other sites More sharing options...
datsun327 Posted September 3, 2004 Author Share Posted September 3, 2004 the car is goin to be a street car. i have the motor together, i have to differant cams i can go with. the cam that is is in there now is 220 @.050 i also have a cam that is a COMP XTREME ENERGY CAM 274/286 DUR. 487/490 LIFT ***sorry for caps it was copy/pasted*** im using an older set of heads that are 76cc . the piston have big relives in them so the vaulves can go a little deeper. here is some extra in for you so you can get an idea of what im working with. to see if it will be worth me doin this on a street car Quote Link to comment Share on other sites More sharing options...
Sleeper-Z Posted September 3, 2004 Share Posted September 3, 2004 sent you a pm is that comp cam xe rated at .050? you can 'over-cam' a motor if the heads aren 't up to duty... not just springs, but flow as well... Quote Link to comment Share on other sites More sharing options...
datsun327 Posted September 3, 2004 Author Share Posted September 3, 2004 ya i just goin to be running some stock lae model corvette heads. i have the smaller cam in the motor noe. sence the heads are stock would doing the lrocker combo help or hurt me. also with my set you would i be BETTER goin with some STOCK non roller rockers? Quote Link to comment Share on other sites More sharing options...
datsun327 Posted September 3, 2004 Author Share Posted September 3, 2004 i didnt get your pm sleeper-z Quote Link to comment Share on other sites More sharing options...
Sleeper-Z Posted September 3, 2004 Share Posted September 3, 2004 http://home.houston.rr.com/tbserv link for pics of the ported heads... you can't run lt1/ls1 heads on a 'normal' sbc. because of reverse flow cooling. well you can, but extensive modifications will need to be done (not worth it). Quote Link to comment Share on other sites More sharing options...
datsun327 Posted September 4, 2004 Author Share Posted September 4, 2004 so i can do the 1.7 and 1.6 combo on the set of head thati i have. or are you saying that the set of heads that you have are ls1/ls1? Quote Link to comment Share on other sites More sharing options...
Sleeper-Z Posted September 4, 2004 Share Posted September 4, 2004 the heads i have are early models, no mods needed. as for the 1.7's, i haven't seen em' available for SBC's... steven m. Quote Link to comment Share on other sites More sharing options...
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