LS3 Small Bores- What cam?
09-28-2013, 06:27 PM
#43
I had a good conversation last week with Damon at Mast. He agreed about them being a bit lazy below 4-4.5k, but said they'd turn on like a ******* LIGHT SWITCH there after. He said for a mainly street car, their 215's would be better suited, but it's still personal preference.
Ed really wants me in the Mast SB LS3's, and I have a quirky trick up my sleeve next year if I get them. But I believe he truly knows what to grind to actually take advantage of the heads. I'm glad you made this thread, bc I was just about to start my own. I think aside from a cam swap, I've taken my heads about as far as I can.
OP, hope you don't mind me piggybacking in here. There really isn't a lot of info available on these, other than the magazine test.
Ed really wants me in the Mast SB LS3's, and I have a quirky trick up my sleeve next year if I get them. But I believe he truly knows what to grind to actually take advantage of the heads. I'm glad you made this thread, bc I was just about to start my own. I think aside from a cam swap, I've taken my heads about as far as I can.
OP, hope you don't mind me piggybacking in here. There really isn't a lot of info available on these, other than the magazine test.
but the bsp ones are and Ed seemed to think highly about them. Last edited by mchicia1; 09-28-2013 at 06:33 PM.
09-28-2013, 09:32 PM
#45
But it doesn't have the pull of a good h/c/i high comp cathedral head car in that 2000-4500 range. I had both and there is no comparison. My old advanced induction setup was fast everywhere. If you were in 2nd at 3k rpms and stabbed the throttle, it would jump out violently. In this setup, it just kind of revs up and goes. But if you're in 2nd at 4500 rpms, it feels like the car gains 200 ft/lbs.
Only real way I can explain it. I am also missing headers though, so that is part of it. Headers would pump my mid range torque up big time probably. But my exhaust setup is still pretty solid, it is very free flowing, so the top end power is still there and that shows at the track. Also keep in mind I am on a forged 347 with -3.2 zero deck Wisecos, so compression is a little lower. If someone could somehow get 11.0 compression with these heads, I think it would make a big difference.
I think the Ed cam will fix most of the problems though and will make these heads work. It should be shipping soon, so I will keep you guys posted.
09-29-2013, 12:23 AM
#46
That is part of it, but I am still at 10.4 :1, not horrendously low. I did all I could to bring it to that though. Milled .030" and put on .040" gasket.
It wasn't lazy with the other 224/230 cam FYI. That cam worked much better. I am pretty sure my issue is mostly the cam I put in. I am also going to degree the next cam install, who knows, maybe my cam timing is wrong too.
It wasn't lazy with the other 224/230 cam FYI. That cam worked much better. I am pretty sure my issue is mostly the cam I put in. I am also going to degree the next cam install, who knows, maybe my cam timing is wrong too.
09-29-2013, 12:57 PM
#47
What do you think of going to a 3.910 x .036 cometic !! if forged pistons (expanding .005) live with .040's the hyperutechtechs (cant spell ...stock pistons.) expanding only .002 might be the way to more horses from a more serious quenching. I might be the Ginny pig on this one now that the weather is getting a little cooler lol.
I doubt going from .040" to .036" would gain me anything.
10-05-2013, 10:37 AM
#50
Cool, I am buttoning it up today. Should have driving impressions today or tomorrow and track times next week. The IVC on this cam is 10 degrees less than my current cam.
FYI, Lunati has catalog cams out specifically for l92 headed ls1 cars.
http://www.lunatipower.com/Media/Doc...0LS%20Cams.pdf
Looks like mine is just a custom version of their high lift cam, having less exhaust lift. I trust Ed's judgement.
FYI, Lunati has catalog cams out specifically for l92 headed ls1 cars.
http://www.lunatipower.com/Media/Doc...0LS%20Cams.pdf
Looks like mine is just a custom version of their high lift cam, having less exhaust lift. I trust Ed's judgement.
10-05-2013, 02:43 PM
#52
The cam degreed within 1, I got .5 btdc. Cam card said 1.5 btdc. I am calling that good since my adjustable timing set only goes in 2 degree increments anyway.
10-05-2013, 09:42 PM
#53
Car buttoned up. Took it out for a couple of blasts and it's MUCH better now. It actually has something under 5k now. I need to tune it now then track next week. Corvette AC cruise Sat, track Sunday. Sounds like a great weekend.
Last edited by mchicia1; 10-05-2013 at 09:52 PM.
10-22-2013, 10:34 PM
#54
Got a few passes in identical DA tonight as the bigger cam.
I gained .2, 1.5 mph in the 1/4, and 3 mph in the 1/8th. Same DA same 60 foot. My shift point was lowered by 1000 rpms though, which is a good thing considering I am running stock ls7 lifters. I tried to leave it in 3rd gear one pass and ended up losing 4 mph since the smaller cam runs out of steam after 6500. The old cam I could leave in 3rd because it kept pulling to 7200, that's probably why I gained 3 mph in the 1/8th but only 1.5 in the 1/4.
12.2 @ 120 with a crappy 2.1 60'. Not bad for all factory parts and a lower compression forged 347. This forged 347 always dynoed like ****, so I am sure this setup would go even faster on a stock short block. This only dynoed 341 rwhp cam only with 241s/ls6intake. I am leaning towards trying headers to see if I can gain more.
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I gained .2, 1.5 mph in the 1/4, and 3 mph in the 1/8th. Same DA same 60 foot. My shift point was lowered by 1000 rpms though, which is a good thing considering I am running stock ls7 lifters. I tried to leave it in 3rd gear one pass and ended up losing 4 mph since the smaller cam runs out of steam after 6500. The old cam I could leave in 3rd because it kept pulling to 7200, that's probably why I gained 3 mph in the 1/8th but only 1.5 in the 1/4.
12.2 @ 120 with a crappy 2.1 60'. Not bad for all factory parts and a lower compression forged 347. This forged 347 always dynoed like ****, so I am sure this setup would go even faster on a stock short block. This only dynoed 341 rwhp cam only with 241s/ls6intake. I am leaning towards trying headers to see if I can gain more.
Uploaded with ImageShack.com Last edited by mchicia1; 10-22-2013 at 10:48 PM.
10-22-2013, 10:55 PM
#55
Oh should also add I tinkered with AFR and timing as well.
The best timing was ramping up to 30 degrees by 4000, down to 25 4400 through 5200, and back up to 27 in the high end. I tried going all the way to 30 but got slower. The AFR followed the timing curve. 12.8 to 4000, 12.5 to 4400-5200, and 12.8 to redline.
I refuse to put this car back on the dyno because it's a heart breaker for sure lol.
The best timing was ramping up to 30 degrees by 4000, down to 25 4400 through 5200, and back up to 27 in the high end. I tried going all the way to 30 but got slower. The AFR followed the timing curve. 12.8 to 4000, 12.5 to 4400-5200, and 12.8 to redline.
I refuse to put this car back on the dyno because it's a heart breaker for sure lol.
10-23-2013, 08:34 AM
#57
10-23-2013, 11:11 AM
#58
Glad to see you found some more mph. Definitely get some more seat time to get that 60' down and you'll have a very solid 11 sec car. Have you tried a drag radial yet? That'll make things much easier and consistent and you'll have more fun at the track without trying to fight a ton of wheel spin.
10-23-2013, 11:41 AM
#59
Glad to see you found some more mph. Definitely get some more seat time to get that 60' down and you'll have a very solid 11 sec car. Have you tried a drag radial yet? That'll make things much easier and consistent and you'll have more fun at the track without trying to fight a ton of wheel spin.
I'll see if I can pick up some lightly used ones.
10-23-2013, 12:58 PM
#60
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Glad to see you found some more mph. Definitely get some more seat time to get that 60' down and you'll have a very solid 11 sec car. Have you tried a drag radial yet? That'll make things much easier and consistent and you'll have more fun at the track without trying to fight a ton of wheel spin.
Picking up 26+ MPH from the 1/8 to the 1/4 is showing these small bore LS3 heads are the real deal.
We're going to have to work together on other projects.
