i can get a great deal on a set of stain less steel long tubes made for a 4th gen lt1 with d port heads and i was wondering if they would fit in my 3rd gen

 

As far as I know, no 4th gen manifolds or headers will fit a 3rd gen. (unless you are talking about LS1 stuff)

 

LPP stainless headers and y-pipe is what iwas looking at

i have after market heads with d port's

 

4th gen manifolds and 4th gen shorties will fit 3rd gens. However, 4th gen long tubes will not, because the frame rails narrow inward by the transmission, which is right where the 4th gen collectors go.

 

got any suggestions i should get

 

Tell us more about your engine and your intended use for the car.

 

By the way, you might want to read through this:
https://www.thirdgen.org/forums/exha...en-body-w.html

 

i am building a 383 out of a 76 block with
TrickFlow Heads 195's, 64cc Chamber 2.02/1.6 Valves
1.6 Rockers, Full Roller
Comp Cams XE284H RPM range 2300 to 6500.
240/246 Duration @ .050 .507/510 Lift w/ 110 LSA


i was just thinking since the the lpp's had d ports they would fit my heads but since there a clearance issue i will have to figure something else out since these wont work i just fiigured they would. i am not running an lt1 a good old carb sbc 383