471 RWHP L88!
Le Mans Master
Joined: May 2000
Posts: 6,493
Likes: 6
From: Bloomington MN
Cruise-In II Veteran
Re: 471 RWHP L88! (Tom73)
Yet after an initial run of 421hp. The throttle bracket was reinforced allowing full open throttle, the next run whistled up 471 horse power at the rear wheels.
Neighbors LS1 C5 is pulling 425 rwhp and it is a daily driver. :)
tom...
Neighbors LS1 C5 is pulling 425 rwhp and it is a daily driver. :)
tom...
AC
Race Director
Joined: Apr 1999
Posts: 15,146
Likes: 477
From: NM
Re: 471 RWHP L88! (A C)
With nitrous? All of the LS1's I have seen on the chassis dyno (and I have seen quite a few) are all in the low 300's.
tom...
Le Mans Master
Joined: May 2000
Posts: 6,493
Likes: 6
From: Bloomington MN
Cruise-In II Veteran
Re: 471 RWHP L88! (Tom73)
With nitrous? All of the LS1's I have seen on the chassis dyno (and I have seen quite a few) are all in the low 300's.
No bottle or blower. Heads, cam, intake, and exhaust plus all the other normal go fast stuff. His goal was to reach 400 but he passed that a bit.
tom...
No bottle or blower. Heads, cam, intake, and exhaust plus all the other normal go fast stuff. His goal was to reach 400 but he passed that a bit.
tom...
AC
Burning Brakes
Joined: May 2000
Posts: 774
Likes: 4
From: RI
Re: 471 RWHP L88! (groovyjay)
Sometimes the most impressive compliments are discovered indirectly. I was reading an old drag racing article about a 1967 Funny car team that was running a fuel injected big block Chevy on Nitro. On the way to the dragstrip they picked up an L88 crate motor they had ordered from a Chevy dealer who was near the track. They had made it to the final round but blew up the race motor. Normally the race motors were blueprinted and balanced and had other modifications to run on Nitro but they took the new L88 crate motor and put it in the Funny car with just the cam and fuel injection system from the race motor. They figured that if they can a least get the car runniing and show up for the final round the other guy may red light or blow up or smoke the tires. The Funny car with the near stock L88 ran within a few tenths of the time with the race motor. I think it was in the low 8s. The L88 is one Badd *****!
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Le Mans Master
Joined: Dec 2000
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Re: 471 RWHP L88! (Ryan77)
Just out of curiosity, what does a good condition L-88 vette go for in terms of price?
Race Director
Joined: Jan 2000
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From: Corsicana, Tx
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Re: 471 RWHP L88! (Chuck Harmon)
Fantastic!!!
That is one serious 427!
Congratulations and thanks for showing us what a "non-wussy" motor can do!!
No offense, but I just like motors that make real HP with serious parts. Vettes are supposed to be performance cars.
Great to see someone willing to prove what their restoration can do!
Thanks,
Jim
That is one serious 427!
Congratulations and thanks for showing us what a "non-wussy" motor can do!!
No offense, but I just like motors that make real HP with serious parts. Vettes are supposed to be performance cars.
Great to see someone willing to prove what their restoration can do!
Thanks,
Jim
Racer
Joined: Aug 2002
Posts: 289
Likes: 0
From: Albuquerque NM
Re: 471 RWHP L88! (Chuck Harmon)
Hi Chuck,
I was looking into the cam specs that you had posted here some clarification is needed....this is direct from GM:
3959180 Mechanical Flat Tappet
This mechanical flat tappet is a ZL-1 and LS-7 mechanical lifter competition cam, good in 427-454. (Use spring P/N 3916164.) The duration at lash point in degrees (intake/exhaust) is 327/333; duration at .050" tappet lift (intake/exhaust) is 262/273; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 580/620. Valve lash is .024/.026 and lobe centerline is 110 degrees.
Technical Notes: Distributor P/N 1104067 or melonized distribuor gear P/N 1045613 must be used on all crate engines with steel camshafts
Note: the centerline had been revised from th previously stated 116.15 they used to have.
Old specs on this cam:
The duration at lash point in degrees (intake/exhaust) is 325/337; duration at .050" tappet lift (intake/exhaust) is 262/273; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 561/600. Valve lash is .020/.024 and lobe centerline is 116.15 degrees.
I must say that this combination works well in the larger brother to the L-88 the LS6.
Larry :)
I was looking into the cam specs that you had posted here some clarification is needed....this is direct from GM:
3959180 Mechanical Flat Tappet
This mechanical flat tappet is a ZL-1 and LS-7 mechanical lifter competition cam, good in 427-454. (Use spring P/N 3916164.) The duration at lash point in degrees (intake/exhaust) is 327/333; duration at .050" tappet lift (intake/exhaust) is 262/273; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 580/620. Valve lash is .024/.026 and lobe centerline is 110 degrees.
Technical Notes: Distributor P/N 1104067 or melonized distribuor gear P/N 1045613 must be used on all crate engines with steel camshafts
Note: the centerline had been revised from th previously stated 116.15 they used to have.
Old specs on this cam:
The duration at lash point in degrees (intake/exhaust) is 325/337; duration at .050" tappet lift (intake/exhaust) is 262/273; and maximum lift with 1.7:1 rocker ratio (intake/exhaust) is 561/600. Valve lash is .020/.024 and lobe centerline is 116.15 degrees.
I must say that this combination works well in the larger brother to the L-88 the LS6.
Larry :)
Le Mans Master
Joined: Dec 2000
Posts: 7,245
Likes: 4
Re: 471 RWHP L88! (VetteLS6)
I ran (and still own) this cam for many, many years. (3959180 Mechanical Flat Tappet )
If you guys haven't heard a hefty big block idling with this cam, well how to describe it?
Remember that old Meatloaf song, "Paradise by the Dashboard light"? Well ol' Meatloaf didn't get near the jollies outta his ride that you get with this cam. If you still have a radio in the car after installing the above cam on a serious big block, unbolt the aforesaid radio and toss it out the window.
That big block will play better music than you'll ever hear on the rad-did-io, cowpokes!
[Modified by 67HEAVEN, 11:49 PM 8/19/2002]
If you guys haven't heard a hefty big block idling with this cam, well how to describe it?
Remember that old Meatloaf song, "Paradise by the Dashboard light"? Well ol' Meatloaf didn't get near the jollies outta his ride that you get with this cam. If you still have a radio in the car after installing the above cam on a serious big block, unbolt the aforesaid radio and toss it out the window.
That big block will play better music than you'll ever hear on the rad-did-io, cowpokes!
[Modified by 67HEAVEN, 11:49 PM 8/19/2002]
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Re: 471 RWHP L88! (67HEAVEN)
I've also used that cam in a 427.... it's killer.....
Burning Brakes
Joined: May 2000
Posts: 774
Likes: 4
From: RI
Re: 471 RWHP L88! (427Hotrod)
I was looking at results of a engine dyno test done on a restored ZL1 Camaro engine. The ZL1 and L88 numbers should be pretty close. Looking at the HP gains with the exhaust system change, that cam was really designed for open headers. Here is the report....
All accessories, production
exhaust manifolds, Camaro
chambered exhaust system,
36 degrees timing
375.7 HP
As above with 2-1/8" headers
replacing the manifolds
418.9 HP
Air cleaner, alternator, AIR
pump removed
447.2 HP
Carb re-jetted, timing set
to 39 degrees
444.2 HP
Chambered exhaust system
removed
523.6 HP
All accessories, production
exhaust manifolds, Camaro
chambered exhaust system,
36 degrees timing
375.7 HP
As above with 2-1/8" headers
replacing the manifolds
418.9 HP
Air cleaner, alternator, AIR
pump removed
447.2 HP
Carb re-jetted, timing set
to 39 degrees
444.2 HP
Chambered exhaust system
removed
523.6 HP
Safety Car
Joined: Jan 2001
Posts: 4,414
Likes: 764
From: Barrington IL
Re: 471 RWHP L88! (mountainmotor)
I have been a fan of L88s for years and it does not surprise me one bit that a stock with open headers L88 dynos in the 470rwhp range. I have seen a few drag race in the 70s and all were running deep in the 11s with one in the high 10s. I realize that they were not stock ie. open headers with drag race gears and slicks but my own eyes do not lie. I just don't understand why people cannot accept the fact a properly tuned L88 can produce over 550hp with headers.
Racer
Joined: Aug 2001
Posts: 401
Likes: 22
From: SF CA
Re: 471 RWHP L88! (mountainmotor)
No port work at all. No gasket matching.
I had asked about porting and the machine shop advised me against it. The gentleman had been in this business almost 40 years and worked on these motors when they were new. He explained to me that as is they already had more than enough flow (my words, I don't recall his exact words) and that there was no benefit to porting in these heads.
The rear wheel numbers were achieved with an AIR pump, the hood down and a fan blowing at the front to cool the motor and try and make use if the cowl induction.
I was running Cam 2, 110 octane, the purple stuff. The advance is set to 40 degrees.
I had asked about porting and the machine shop advised me against it. The gentleman had been in this business almost 40 years and worked on these motors when they were new. He explained to me that as is they already had more than enough flow (my words, I don't recall his exact words) and that there was no benefit to porting in these heads.
The rear wheel numbers were achieved with an AIR pump, the hood down and a fan blowing at the front to cool the motor and try and make use if the cowl induction.
I was running Cam 2, 110 octane, the purple stuff. The advance is set to 40 degrees.
Safety Car
Joined: Aug 2001
Posts: 3,892
Likes: 13
From: Pettis Performance 565 with two stages of Nitrous Supply nitrous 1.082, 4.61 at 155, 7.17 at 192
Re: 471 RWHP L88! (BAD-L88)
No doubt that L-88's make a lot of power, have you had it dyno'd with the exhaust in place, through the mufflers or sidepipes. Any plans on a 1/4 time slip. :chevy