cam suggestions???
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TECH Apprentice
Joined: Jan 2010
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cam suggestions??? ok guys i am really new to the LS engines, i just sold all my gen1 sbc stuff to go ls.... so far i have bought a set of ls3 heads, i plan to put them on top of of a LQ4,mill them to get compression into the 10.8 range, its getting a 4 barrel intake and a carb.
car specs as follows
71 nova 3350 with driver(old set up with gen1 sbc with aluminun heads)
t56 6 speed
410 9" out back
car is a driver, sees strip 1-2 times a year at most, obviously i want most driveabilty and the most hp...compromise of each...i dont want to lose my 6the gear(must be able to lug it down to 1800 on hwy)
shooting for 550 fwhp
i was thinking of this build + a little more compression http://www.carcraft.com/techarticles...comp_cams.html
but someone said it may have no low end...???
help please ...trying to keep this as low budget as possible so i dont want to be doing things like cam swaps 2-3 times to get it right. thanks!
car specs as follows
71 nova 3350 with driver(old set up with gen1 sbc with aluminun heads)
t56 6 speed
410 9" out back
car is a driver, sees strip 1-2 times a year at most, obviously i want most driveabilty and the most hp...compromise of each...i dont want to lose my 6the gear(must be able to lug it down to 1800 on hwy)
shooting for 550 fwhp
i was thinking of this build + a little more compression http://www.carcraft.com/techarticles...comp_cams.html
but someone said it may have no low end...???
help please ...trying to keep this as low budget as possible so i dont want to be doing things like cam swaps 2-3 times to get it right. thanks!
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that cam they used was not made for the LS3 heads... take 10 degrees off the intake and put it on a 114 LSA and that would be alot closer... for a 'small' cam, the Hot Cam isn't all that bad... it will give u good low and mid range, at the expense of about 10-15hp at 6000...
Thread Starter
TECH Apprentice
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how about this cam? Its spec'd to my engine size and the ls3 style heads....
too much, too little ?????? will it make the hp and low end???
[URL="http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=1411&sb=0"]
too much, too little ?????? will it make the hp and low end???
[URL="http://www.compcams.com/Cam_Specs/CamDetails.aspx?csid=1411&sb=0"]
Comp cam I think that cam with 231/247 duration would give you some low end driveability problems.
I'd go a lil smaller. Everyone will prolly say go bigger but there's trade offs each way.
I'd go a lil smaller. Everyone will prolly say go bigger but there's trade offs each way.
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OK 1st who is patrickg? ...Remember i'm kinda new to the Ls thing....be gentle withe me.....lol. \
honestly tho i'm kind of getting confused on all the cam talk seems everyone has a different opinion on the cams for a l92/ls3 engine.
plane and simple give me a proven combo for a 6.0/364 ls3 head carb'd engine. i'd like to make 550fwhp and have good street manners (ie be able is idle under 1000rpm and lug it in 6th gear at 1600 on the hwy and not surge)
maybe i'm asking to much?? but this is the whole reason for going LS, it would be tough on a afffordable gen1sbc....thanks
honestly tho i'm kind of getting confused on all the cam talk seems everyone has a different opinion on the cams for a l92/ls3 engine.
plane and simple give me a proven combo for a 6.0/364 ls3 head carb'd engine. i'd like to make 550fwhp and have good street manners (ie be able is idle under 1000rpm and lug it in 6th gear at 1600 on the hwy and not surge)
maybe i'm asking to much?? but this is the whole reason for going LS, it would be tough on a afffordable gen1sbc....thanks
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I really dont think you can fit anything close to that big in even if you wanted to, after milling. Unless your going aftermarket pistons or notching your pistons.
LQ4s have dished pistons with valve reliefs, but the reliefs are for 2.00" valves, not 2.160". You also wont make it to 10.8:1 compression.
LQ4s have dished pistons with valve reliefs, but the reliefs are for 2.00" valves, not 2.160". You also wont make it to 10.8:1 compression.
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I really dont think you can fit anything close to that big in even if you wanted to, after milling. Unless your going aftermarket pistons or notching your pistons.
LQ4s have dished pistons with valve reliefs, but the reliefs are for 2.00" valves, not 2.160". You also wont make it to 10.8:1 compression.
LQ4s have dished pistons with valve reliefs, but the reliefs are for 2.00" valves, not 2.160". You also wont make it to 10.8:1 compression.
This article backs up the data, yes, the valve events are the critical part to worry about.
http://www.gmhightechperformance.com...son/index.html
Robin stated that even the biggest one still have .100 clearance on the intake and that is on LS3 flat tops.
I cc'd the pistons (6.7cc dish) and the combustion chambers came out to 62cc after taking off .030 and the current setup with stock L92 headgaskets, I am at 10.6:1 cr, I went back to the GM gaskets from the .045 Cometics when I tore the engine down in fall. The .045 - .052 was only like .2 cr difference. I can run more timing now if I want so no big deal for me.
My current cam is just like the Lunati, if I had PTV issues with this cam or my old one I think I would know. I had 4000 miles on the old cam but it was lame at about 5600 rpms and I didn't like it so I put the EPS cam in last fall.
http://www.gmhightechperformance.com...son/index.html
Robin stated that even the biggest one still have .100 clearance on the intake and that is on LS3 flat tops.
Piston-To-Valve Clearance
An important question when installing a new cam in an otherwise production engine, is whether the valves will hit the piston with the increased duration and tightened centerlines. We checked the biggest cam with the tightest LSA (that subsequently was not chosen for the test because of too much cam overlap) to verify piston to valve clearance. With a 232/246-duration, 0.614/0.619-inch lift on a 112 LSA, this cam still had 0.100-inch clearance on the intake valve and 0.120-inch on the exhaust valve. We generally like to see at least 0.080-0.100-inch clearance on the intake and 0.100-0.120-inch on the exhaust, depending on how brave you are and how confident you are the valvetrain is in control.
An important question when installing a new cam in an otherwise production engine, is whether the valves will hit the piston with the increased duration and tightened centerlines. We checked the biggest cam with the tightest LSA (that subsequently was not chosen for the test because of too much cam overlap) to verify piston to valve clearance. With a 232/246-duration, 0.614/0.619-inch lift on a 112 LSA, this cam still had 0.100-inch clearance on the intake valve and 0.120-inch on the exhaust valve. We generally like to see at least 0.080-0.100-inch clearance on the intake and 0.100-0.120-inch on the exhaust, depending on how brave you are and how confident you are the valvetrain is in control.
My current cam is just like the Lunati, if I had PTV issues with this cam or my old one I think I would know. I had 4000 miles on the old cam but it was lame at about 5600 rpms and I didn't like it so I put the EPS cam in last fall.
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http://www.compcams.com/Cam_Specs/Ca...csid=1426&sb=0
i was eyeballing that one i really like the specs of it but was wondering if its still gonna reach my power goal of 550fwhp?? looks like less int duration more ex dur. and alot more lift....but like i said i'm not a cam guru...
