Pulleys for an LT4?

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Jul 8, 2004 | 09:04 PM

1996man

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Melting Slicks

Joined: Dec 2001

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From: Gainesville Fl

Pulleys for an LT4?

OK before you start yelling at me let me say that the search feature is not working with a crap so i was not able to find any past info on this. Who makes the aftermarket pulleys for the LT1? how much HP do they free up? are the LT1 and LT4 pulleys the same size? i heard one time that the LT4 pulleys were the same size the aftermarket ones were so the LT4 owners didnt need to get aftermarket underdrive pulleys but i keep hearing conflicting information. if someone knows for sure that would be great otherwise if you can post some manufacturers of aftermarket pulleys that supposedly free up HP i can call them directly and talk to them about it. thanks a lot guys

Jul 8, 2004 | 09:30 PM

Zix

Le Mans Master

Joined: Jul 1999

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From: Phoenix AZ

I contacted both March and ASP, and neither company makes a pulley for the LT4. They both stated that lack of interest is the reason, the LT4 pulley is apparently different than the LT1

Jul 8, 2004 | 09:43 PM

1996man

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Melting Slicks

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From: Gainesville Fl

damn. do you have the links to their websites? im curious to talk to them about it

Jul 8, 2004 | 10:18 PM

Zix

Le Mans Master

Joined: Jul 1999

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From: Phoenix AZ

http://www.marchperformance.com/
http://www.aspracing.com/

I talked to them about a year ago when I was doing heads/cam

Jul 9, 2004 | 11:09 AM

1996man

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Melting Slicks

Joined: Dec 2001

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From: Gainesville Fl

i actually see some stuff on BOTH sites that might possibly work. im not ready to order now but i guess i will have to call and talk to both companies when i AM ready. anybody else have experiences they would like to share with LTx pulleys? any problems from either company? any problems with smaller pulleys period?

Jul 9, 2004 | 11:18 AM

tjwong

Le Mans Master

Joined: Jan 2003

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From: Portland Oregon

A LT1 pulley will fit on the LT4. The only difference between the LT4 and the LT1 was that the LT4 was equipped with a dual mass balancer assembly. It is nuetral balanced so that means that you can use a LT1 hub on the LT4 as the belt location is identical to the LT1. The only thing is that you will loose the harmonic dampening of the OE balancer. Thus this could shorten the life of the crankshaft.

Jul 9, 2004 | 12:21 PM

Nathan Plemons

Race Director

Joined: May 2001

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Quote:

Originally Posted by tjwong

That's why pullies for a Vette cost a lot more than the F-body units. On an F-body the underdrive pulley just bolts between the hub and the balancer. For a vette the underdrive pulley also has to be a balancer because there is not room to stack two pieces. This makes them cost a whole lot more.

Jul 9, 2004 | 12:25 PM

STEVEN13

Melting Slicks

Joined: Sep 2003

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From: N. Babylon NY

I ordered an ASP pulley set for my 1992 (still waiting to get it over 1 month). The reason I am going to use this set up is because my stock damper broke. I don't expect to gain a whole lot. I hoping it helps my powersteering pump (run cooler)as I club race about 4 events a year.

Also for a 1992 you have to convert to a single grooved belt.

Steven