Help an Aussie 6l cam l92 heads
TECH Apprentice
Joined: Jan 2008
Posts: 366
Likes: 0
From: Gladstone, Queensland, Australia
I know have a 233 intake lobe 114 ICL and run 30 deg of timing and 12.5:1 afr, WKMCD is right if the engine is losing torque with less then 25 deg timing. ie at 20-22 deg timing the engine is making max torque then any more timing(even if it doesnt knock) the engine loses torque it needs a later ICL or less comp. Now I have found as long as the timing is set right at peak torque with a very high dyn comp engine then low timing doesnt matter as peak combustion occurs at the right time still but if its over advanced it gets negative tq. Although in general the heads will love spark right till knock so say 32 deg it gets knock it will keep making power till it gets there this is a good sign.
The trick is maybe to look at the wider LSA options, as you are chasing top end power with high compression, it is highly advisable to maybe contact spinmonster at corvette forum he has some 116 LSA cams that are track and dyno proven on high comp LS3s, they are mid 230s intakes with over 600 lift with the high comp and wide lsa they work well considering they are on 114 ICL. They rev to the moon and it will also give you better clearance then a 108ICL cam.
The trick is maybe to look at the wider LSA options, as you are chasing top end power with high compression, it is highly advisable to maybe contact spinmonster at corvette forum he has some 116 LSA cams that are track and dyno proven on high comp LS3s, they are mid 230s intakes with over 600 lift with the high comp and wide lsa they work well considering they are on 114 ICL. They rev to the moon and it will also give you better clearance then a 108ICL cam.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 57
Likes: 0
From: Australia
I had 36 thou off heads, stock gaskets, with a 240 intake lobe I had 120 thou ptv clearance on 160 thou reliefs so 40 thou interference on a 108 ICL.
The question I ask Paul is. Are you running the Higgins heads.. Do you have stainless valves? If so this is the issue go back to stock LS3 valves and problem solved mate...good luck
The question I ask Paul is. Are you running the Higgins heads.. Do you have stainless valves? If so this is the issue go back to stock LS3 valves and problem solved mate...good luck
Big cam is back in and with correct pushrod length i have 95 thou clearence on intake and exhaust this is using feeler gauges and check springs, 95 is a bit tight on exhaust. I've cut 80 thou on exhaust so maybe another 10 thou req or 20 to make it safe
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 57
Likes: 0
From: Australia
I know have a 233 intake lobe 114 ICL and run 30 deg of timing and 12.5:1 afr, WKMCD is right if the engine is losing torque with less then 25 deg timing. ie at 20-22 deg timing the engine is making max torque then any more timing(even if it doesnt knock) the engine loses torque it needs a later ICL or less comp. Now I have found as long as the timing is set right at peak torque with a very high dyn comp engine then low timing doesnt matter as peak combustion occurs at the right time still but if its over advanced it gets negative tq. Although in general the heads will love spark right till knock so say 32 deg it gets knock it will keep making power till it gets there this is a good sign.
The trick is maybe to look at the wider LSA options, as you are chasing top end power with high compression, it is highly advisable to maybe contact spinmonster at corvette forum he has some 116 LSA cams that are track and dyno proven on high comp LS3s, they are mid 230s intakes with over 600 lift with the high comp and wide lsa they work well considering they are on 114 ICL. They rev to the moon and it will also give you better clearance then a 108ICL cam.
The trick is maybe to look at the wider LSA options, as you are chasing top end power with high compression, it is highly advisable to maybe contact spinmonster at corvette forum he has some 116 LSA cams that are track and dyno proven on high comp LS3s, they are mid 230s intakes with over 600 lift with the high comp and wide lsa they work well considering they are on 114 ICL. They rev to the moon and it will also give you better clearance then a 108ICL cam.
Teching In
Joined: Jan 2007
Posts: 2
Likes: 0
hey joel, ported by a guy in adelaide flow 370 cfm he does some pro stock gear.
Big cam is back in and with correct pushrod length i have 95 thou clearence on intake and exhaust this is using feeler gauges and check springs, 95 is a bit tight on exhaust. I've cut 80 thou on exhaust so maybe another 10 thou req or 20 to make it safe
Big cam is back in and with correct pushrod length i have 95 thou clearence on intake and exhaust this is using feeler gauges and check springs, 95 is a bit tight on exhaust. I've cut 80 thou on exhaust so maybe another 10 thou req or 20 to make it safe
Hope this helps
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 57
Likes: 0
From: Australia
Well after some head scratching etc waiting for 7.325 pushrods on backorder she's running untuned atm(just changed oil after 50kms running) she won't idle too happy on the old tune but drives quite nice(yep i'm suprised) ICL at 111 and comp 11.7
Soundsweet
hope to get the tune done end of week
Soundsweet
hope to get the tune done end of week
TECH Apprentice
Joined: Jan 2008
Posts: 366
Likes: 0
From: Gladstone, Queensland, Australia
11.7:1 comp...and that big cam, this things gonna scream......
So what was the go with the ptv issue....Pushrods to long, What lifters you using were the valves holding open or something? Shorter pushrods fixed it....pushrod checker is a must...
I am going to a 40 thou gasket in mine and 12:1 comp soon(32 thou quench yikes!). Now I have a single plain I will need to recam. My new springs arrived the other day. New cam in mind nothing to out of ordinary just f'n huge thats all lol...Nos plate goes on then.. Go the stock stroke I say Paul.
So what was the go with the ptv issue....Pushrods to long, What lifters you using were the valves holding open or something? Shorter pushrods fixed it....pushrod checker is a must...
I am going to a 40 thou gasket in mine and 12:1 comp soon(32 thou quench yikes!). Now I have a single plain I will need to recam. My new springs arrived the other day. New cam in mind nothing to out of ordinary just f'n huge thats all lol...Nos plate goes on then.. Go the stock stroke I say Paul.
Thread Starter
Staging Lane
Joined: Nov 2009
Posts: 57
Likes: 0
From: Australia
Ordered pushrods from US with cam guessed lenght(big No NO, current lenght 7.425 minus 40thou 7.375 rods close i though) never measured the CC of heads before porting etc but ended up with 60cc chambers more like a 60>70 thou mill to me????? i've learnt now ended up with 7.325 rods and she runs quite as a mouse gets tuned fri arvo for a big cam untuned she drives not bad.
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Registered User
Joined: Jan 2015
Posts: 1
Likes: 0
From: Aust
Havent been on here for 4yrs, old girls has been running really well, went with E85 fuel and twin fuel pump and 65lb injectors.
Just noticed a tick in engine and a pull down has a failed lifter, not any major damage. Looking at morels
Just noticed a tick in engine and a pull down has a failed lifter, not any major damage. Looking at morels
