Anyone with SLP "ZL- stroker" check in
Originally Posted by GregWS6&z28
SLP really hasnt done alot. They took the design cues from GM's 96-97 SS model. GM had it first. If you ask me, they dont know half of what's goin on. I was at SLP Day @ Englishtown on Oct 9th and I got to talk with one of their employees that was racing their 427 vette. He got out the car after his best run of a 12.79 and was goin on and on of what a monster it was and how fast he ran. Nope, didnt sell that one on me.
1996 Z28/SS models which were made by GM, not SLP.
well the SLP badging said 427, not that could be their new badging like 421 on their 421 Bobcat GTO, but never got to see if it was a 7.0 liter or not. I'm thinking maybe it was advertising horsepower, cause the 427 motor should run faster than that
well the SLP badging said 427, not that could be their new badging like 421 on their 421 Bobcat GTO, but never got to see if it was a 7.0 liter or not. I'm thinking maybe it was advertising horsepower, cause the 427 motor should run faster than that
There were a few that had the 382 stroker engines (rebuilt in Tom's River), but not a huge number by any means. That is why they only sell the new crate engine and no install and no dyno.
The Dyno as I have been told, is now being utilized primarily for R&D.
I haven't run across anybody locally who had the rebuild, but try posting the question over on the FAOA (Firehawk Assn of America). You may get a couple of responses, but no promises.
The Dyno as I have been told, is now being utilized primarily for R&D.
I haven't run across anybody locally who had the rebuild, but try posting the question over on the FAOA (Firehawk Assn of America). You may get a couple of responses, but no promises.
Last edited by Firehawk526; Nov 8, 2004 at 06:35 PM.
Originally Posted by GregWS6&z28
1996 Z28/SS models which were made by GM, not SLP.
well the SLP badging said 427, not that could be their new badging like 421 on their 421 Bobcat GTO, but never got to see if it was a 7.0 liter or not. I'm thinking maybe it was advertising horsepower, cause the 427 motor should run faster than that
well the SLP badging said 427, not that could be their new badging like 421 on their 421 Bobcat GTO, but never got to see if it was a 7.0 liter or not. I'm thinking maybe it was advertising horsepower, cause the 427 motor should run faster than that
And that is the way it happened, period.
I've had SLP products before and they've always been well made parts. That said there are parts from other companies that make more power, i.e. Headers, head/cam packages, etc.
Launching!
Joined: Nov 2001
Posts: 236
Likes: 0
From: Memphis, TN
Originally Posted by cyclerage
It sounded really good to me to, but I saw them run there ZL402 GTO at SLP day, 
They claimed 575hp, 500 at the wheels, but the car went a best of 12.16 at about 117. There were stock Z06s there doing .3 less than that. I will say on there part that there driver was not impressing me at all. I was trapping about 122 and I dont have any where near as much power as they were runing. Considering there weight, they should have been alteast 125 if they had the power the were claiming. But who knows??? There's a list of reasons why the car may have been slow that day.
The motor still sounds like a good deal but I would go through it before I installed it.
They claimed 575hp, 500 at the wheels, but the car went a best of 12.16 at about 117. There were stock Z06s there doing .3 less than that. I will say on there part that there driver was not impressing me at all. I was trapping about 122 and I dont have any where near as much power as they were runing. Considering there weight, they should have been alteast 125 if they had the power the were claiming. But who knows??? There's a list of reasons why the car may have been slow that day.
The motor still sounds like a good deal but I would go through it before I installed it.
At raceday, the SLP GTO was raced on 16 drag radials - which simply 'blew-off' when the car was launched (no traction = no good times). The clutch was a stock ZO6 unit, which lasted exactly 2.5 runs. Besides slipping between any WOT shifts, it completely lost clamp on the 3rd pass 1-2 shift. A 4000 lbs vehicle (GTO is heavy to start, then add 100 lb iron block = 4000lbs) with 550ft-lbs of torque is simply way too much for the GM clutch.
Anyway, went to E-town yesterday after installing an Exedy twin disk clutch -(which works beautifully) first pass was 11.87 @ 122.5, with easy launch to confirm traction (2.01 60ft). 2nd pass was on target for something better with a 1.9 60 ft, then the CV joint blew up on the 1-2 shift.
The engine is legit, but the car is a heavy pig with a limited capability IRS (as we found yesterday) - if we put it in an f-body or something with a reasonable weight and decent rear axle, it would run 10s all day.
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) on the GTO 
TECH Enthusiast
Joined: Apr 2002
Posts: 588
Likes: 0
From: SC
I personally have had a lot of slp items on my car and not had any major problems with the products or the customer service. The headers were a pain in the butt, but they made power. They are off the car now simply because with all the engine work they were too hard to keep putting on and taking off.
The slp folk were also really helpful when my clutch locked up at the line at last year's slp day. They even offered to put it up on a lift there and look at it -- I appreciated that.
However, I read the post in the dyno section about the guy with the smoking slp 402 -- I would be very worried about that, and unless they take care of that guy I would not want to be the next guy with a smoking motor -- been there, done that myself (not with slp).
The slp folk were also really helpful when my clutch locked up at the line at last year's slp day. They even offered to put it up on a lift there and look at it -- I appreciated that.
However, I read the post in the dyno section about the guy with the smoking slp 402 -- I would be very worried about that, and unless they take care of that guy I would not want to be the next guy with a smoking motor -- been there, done that myself (not with slp).
Launching!
Joined: Nov 2001
Posts: 236
Likes: 0
From: Memphis, TN
Originally Posted by max's dad
I talked to SLP on 11/2 regarding my smoking 402. They did make calls to Mikey at Rapid, but have not called me on the issue. I'll post their response once I get one.
Correct, we've been talking to Mike at Rapid, because that is where the car is. However, I called you this morning, to touch base
- I will call Mike again this morning, I know they are busy there too. So far, testing has shown all encouraging results (leak down, plugs, etc). We'll get to the bottom of this - just need to go through things step-by-step, looking for what is wrong. 
I never had any experience with SLP up until 4 months ago. I used their newest H/C package. I believe it is the same heads used on the 402. Anyway, my best numbers are 422whp through the stock rear end. I put 3.91's in the car last week and put down 411whp with a more conservative tune as well. The car although a pig(checked in at 3940 with me 190lbs) It should go low 12s now. The last time I went and ran the 12.7 @113mph was without the gears or Longtubes installed, it was though the JBA shorties.
I'm hoping to do the 402 as well but would like to see how max's dad's car turns out first. So far so good on the SLP parts though.
I'm hoping to do the 402 as well but would like to see how max's dad's car turns out first. So far so good on the SLP parts though.
Originally Posted by 777
does this package come with the alternator holes drilled already?
Launching!
Joined: Nov 2001
Posts: 236
Likes: 0
From: Memphis, TN
Originally Posted by cyclerage
If this was properly resolved already I would have bought one last week. I'm not bashing SLP, I use there parts on all my car and will continue to. I just want to find out what the cause of this issue was.
Gentlemen,
Rest assured, it WILL be properly resolved and SLP will stand behind the product - these things take some time and we want to handle things properly...plus, we are all long-distance to each other. However, I have been in contact with the installer and working on reaching the customer. I can assure you, the smoke issue on this engine will be addressed properly and fairly.
On a separate note, we have over 20 of these out there - so I expect we'll see more responses in due time.
Best regards