i keep seeing people say that they are using fast tb's and nw tb's, tb's all designed for the ls1 well i got a professional products one and it has three bolt holes and the intake manifold has four, am i the only one that is having this issue on inspection pics of the fast and nick williams tb i notice they too only have 3 bolt holes

need help this is the last part for my project and its really screwing me up.

 

I know Holley sells a 4 bolt version

 

my fast 90mm TB has 4 holes and bolts up perfect.

 

The NW and FAST TB's (and a couple other brands I cant remember) are 5 bolt versions, the bottom 2 holes are the same as the 3 bolt style. They work on the 3 bolt LS1/LS6 intakes and the 4 bolt LS2, LS7, L76, LS3 intakes. The Holley is a 4 bolt version. The professional products ones are the 3 bolt style.

 

Sounds like you have an 85MM throttle body and a 90MM intake. A Nick Williams has five bolt holes, not three. Look at the pics in this ad. http://cgi.ebay.com/ebaymotors/LS1-L...ayphotohosting

 

thanks for all the help guys looks like its between nw and holly

are all nw the five bolt design or do you have to ask for it

 

I have this one and it's also a 5 bolt design. http://www.byunspeed.com/product_inf...6ec3cbad0573c9

 

im thinking of going with the holley version i like the looks of its design
thanks again for all your help guys