Is it worth it to ditch SLPs for longtubes?
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From: Silver Spring, Md.
Is it worth it to ditch SLPs for longtubes? I'm thinking about going to longtubes but am not too sure if it would be worth it. The SLPs already come with 1 3/4 primaries so how much power can I realisticly expect to gain?
Thread Starter
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Joined: Feb 2002
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From: Silver Spring, Md.
Originally Posted by qwk93ta
SLPs are not stock manifolds!!! I have them on my car too and want to replace them with LTs. You are looking at about a 20 HP gain from the switch.
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SLPs have a small collector and with a modified car (cam & heads) this is a problem. With a good set of LTs you will see more power. I have seen several people make the switch and dyno 15 to 20 HP. If we are talking about stock or bolt-on car you will not see that kind of difference. Also, SLPs don't have the best clearance for changing plugs and on LT1s that is a huge issue. Several different LTs make changing plugs easier!
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would it be worth switching from mac midlengths to pacesetter lts??? im going to be doing some engine mods, actually a whole new motor within the next year. should i just save the time and money and get lts now???
I will be selling my SLPs to get a set of Pacesetters this spring. Pacesetters are around $450 plus the y-pipe and I should be able to sell the SLPs for $350 to $400 since they sell new for something like $800 including the y-pipe.
Hey Dave, if your interested Ill be parting the exhaust out on the black turd prob next week, stepping up to Kooks. So my flp 1 3/4 longtubes with ypipe will be up forsale. If your interested let me know.
Thread Starter
11 Second Club
Joined: Feb 2002
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From: Silver Spring, Md.
Originally Posted by STROKED
Hey Dave, if your interested Ill be parting the exhaust out on the black turd prob next week, stepping up to Kooks. So my flp 1 3/4 longtubes with ypipe will be up forsale. If your interested let me know.
I've seen this discussion about 15-20 times over the last 6+ years of reading message boards. The gains are not as stout as you might think. The mid-length 1-3/4" headers like the SLP's, and AS&M's, RK's are actually good performers and the gains in upper RPM hp are minimal at best. The true gains from a longtube header come in the mid-range torque (about 10-15rwtq) increase from the longtubes. If you really want to see a top end increase, go with a 1-7/8" longtube or stepped design header.
I seriously considered swapping to a longtube design header. After much diliberation I concluded that because my car is lowered, I didn't want to deal with the headache of ground clearance issues with the longtubes, especially since my car, at the time, was my daily driver. The minimal gains, to me, just weren't worth the extra effort etc...
Here is something else to consider:
Years ago, for those that have been around this long, George Baxter's 700+rwhp, YS trim blown 97 SS had AS&M mid-length headers. After switching to Hooker longtubes, he actually lost about 10rwhp on the topend......!!
Just my .02 as usual....
Mike
I seriously considered swapping to a longtube design header. After much diliberation I concluded that because my car is lowered, I didn't want to deal with the headache of ground clearance issues with the longtubes, especially since my car, at the time, was my daily driver. The minimal gains, to me, just weren't worth the extra effort etc...
Here is something else to consider:
Years ago, for those that have been around this long, George Baxter's 700+rwhp, YS trim blown 97 SS had AS&M mid-length headers. After switching to Hooker longtubes, he actually lost about 10rwhp on the topend......!!
Just my .02 as usual....
Mike
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Headers and Smog?? I am looking to get some headers for my 93 camaro and I am in the middle becaus e i want to get shorties so that they are no problems with my smog..but i want the power of longtubes...someone told me that longtubes will pass smog when they hook up my car but wont pass visual....?tru or not ? and should i just go something like pacesetter longtubes or go SLP's???any help would be good thanks!
Originally Posted by qwk93ta
SLPs have a small collector and with a modified car (cam & heads) this is a problem. With a good set of LTs you will see more power. I have seen several people make the switch and dyno 15 to 20 HP. If we are talking about stock or bolt-on car you will not see that kind of difference. Also, SLPs don't have the best clearance for changing plugs and on LT1s that is a huge issue. Several different LTs make changing plugs easier!
I think you've been
You aren't gonna gain 20 hp over 94-95 SLP's going to LT's. 
I would like to see a back to back dyno with Shorties vs LTs.
On my hot cammed car I did not pick up much of anything from changes I made except from tuning.
stock LT4 H/I/Hot cam, ST3500, BBK shorties and 3.23s, and no real tuning, pulled 320ish.
Put on LT4 Heads with bowl work and larger valves, LTs, duals, TH350, 3600 stall, 3.73s, and no tuning, 320ish.
After leaning it out pulled 340ish.
I think if the motor is pusing alot of air LTs are worth it but the cam has to be pretty big and/or the Cubic inches have to be there.
I see alot of the same post about all this power to be gained but I have not seen it with my vehicle.
On my hot cammed car I did not pick up much of anything from changes I made except from tuning.
stock LT4 H/I/Hot cam, ST3500, BBK shorties and 3.23s, and no real tuning, pulled 320ish.
Put on LT4 Heads with bowl work and larger valves, LTs, duals, TH350, 3600 stall, 3.73s, and no tuning, 320ish.
After leaning it out pulled 340ish.
I think if the motor is pusing alot of air LTs are worth it but the cam has to be pretty big and/or the Cubic inches have to be there.
I see alot of the same post about all this power to be gained but I have not seen it with my vehicle.