I have an 87 LB9 with 700-R4 auto and I'm looking for some new underdrive pulleys after reading on http://www.thunderracing.com that they can add between 12 and 15bhp!! They have loads from 2 different manufacturers March performance pulleys and Auto Specialties Performance. Which manufacturer should I go for and then what series of pulleys would be the best?

Also, with my future mods in my sig how much extra hp will I get and how much off my 1/4??

Thanks for the help.

Rob



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1987 IROC-Z Auto (LB9)
Black/grey with kick *** looks

Mods
Custom exhaust. 4 Inch pipe from the headders all the way back to a single muffler at the rear. No Cat.

Future mods:
K&Ns
RAM Air
New Underdrive pulleys-either March performance pulleys or Auto Specialties Performance

 

I would say that you should save your money, but that's just me. I've got a set of the Hypertech ones on my car and I didn't notice any difference (didn't take it to the track or anything, just judging by SOTP).

-Mark W.
'88 SC Camaro w/ 305 TBI

 

yea.. there was a post here a while ago, i mean a long while ago, about march pulley's.. i believe there were btw 5 and 10 people who ahd them, and none of which were impressed with them, given the amount of money they spent. they all said put the money somewhere else, and get the pulley's later.. i dont personally have them, but i've seen all the ad's and all the claims, but ive talked to a good number of people who have them and say they dont notice a bit of difference

 

actually ive heard its one of the best mods next to headers. maybe its on closer to stock engines that you notice it

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Rick
90 Camaro RS 305 TBI
400 small block, Hooker 1 5/8 shorties, Random Tech Cat, Hooker aero chamber cat back on the way!!
TH700-R4 with Trans-Go shift kit (corvette servo on the way)
MacEwen Motorsports White Gauge Overlays
14" K&N X-Stream Open Element
GTS Headlight and Taillight covers
5% Limo Tint all around
Classic White Chevy Bowtie sticker on rear window
http://www.geocities.com/esvalenz

Man if my camaro were a rice-rocket all those mods would give me what...easily 50-60 hp!!!