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73-87 Chevy _ GMC Trucks => Performance => Topic started by: luckyz1369 on December 26, 2010, 12:49:34 pm

Title: doug Thorley fitment
Post by: luckyz1369 on December 26, 2010, 12:49:34 pm

I have a 75 3/4 ton silverado 4x4 and was wondering if the thorley 300Y headers will fit my rig? Any feedback is appreciated! :-\

Title: Re: doug Thorley fitment
Post by: beastie_3 on December 26, 2010, 06:18:45 pm

did you check to see what the PN says?

Title: Re: doug Thorley fitment
Post by: greenmonster on December 27, 2010, 06:05:24 am

I had the same pair on my 75 k10.they fit great.They got some rust holes in them so I changed to so hookers.The thorleys make alot more power.

Title: Re: doug Thorley fitment
Post by: beastie_3 on December 27, 2010, 04:43:04 pm

4-1 generally focus on HP, while tri Y focus on TQ, IIRC

Title: Re: doug Thorley fitment
Post by: luckyz1369 on December 28, 2010, 06:45:42 pm

well I will be dropping the motor in tomorrow! I'll know for sure then! I made some measurements today and it looks good. Thanks for the help! I'll send pics when I get her done!