What is different about the '85-'86-'87 trucks?

[Gary]

Well I put a small block out of a 60 something truck with headers right into my 85, guy who did the actual swap for me didn't complain about the headers at all, only hitch was I "had" to get catalytic converters added in or the muffler shop wouldn't weld up my pipes for me :/

[swb85]

Well I bit the bullet and bought a set of those stainless headers off ebay for my '85....they should be delivered today. Hopefully we'll get some nice weather this week and I can test fit them, only thing I'm concerned about is clearance around my clutch linkage. I'll post up pics/results when I get them.

EDIT: Headers are here, they look pretty darn nice! Polish job isn't perfect, but the welds look good and the flanges are nice and thick. The brand name is Wysco, so I logged on to their site to check them out, and sure enough they say the headers only fit 73-84 and that they won't fit 85 & up because the #3 primary tube won't clear the upper control arm. I didn't think control arms changed?? Hopefully will test fit one night this week to see for sure.

[swb85]

Here's a couple pictures of the headers I snapped last night, they look pretty good to me! Hopefully I'll get to test fit them on Friday.

[rage'nrat638]

Originally Posted by swb85

Here's a couple pictures of the headers I snapped last night, they look pretty good to me! Hopefully I'll get to test fit them on Friday.

sweet... how do they fit? i ordered a set for my 69 and they did not fit

[swb85]

Originally Posted by rage'nrat638

sweet... how do they fit? i ordered a set for my 69 and they did not fit

The #3 primary tube comes real close to the control arm, but that's easily dealt with. Also the very back mounting hole on both flanges needed elongated about 1/4", they didn't quite line up with the holes in the heads. Everything else fit great!!
Pics of the control arm clearance are in this thread:
http://67-72chevytrucks.com/vboard/s...ighlight=wysco

[f.monroe]

Looks like the reason they are soo close is because the headers are the same as those for 70-74 Camaros and 6?-72 Chevelles . Those headers have been used on lowered trucks for a while so I am sure they sell those headers for both applications . Frank

[KMK454]

Do you mind me asking how much those set ya back? I need a new set of headers and exhaust on my 78 with a 305, the first aftermarket set has rusted away...

[swb85]

KMK454--they were just under $250 shipped if I remember correctly.