Exhaust manifold question

[Canuckvetter]

Can I use the straight down exhaust dump cast manifolds on a 327 in a 67 C-10 coil spring truck without any crossmember conflict? I am having built a 327 to produce 300 HP and thought I should use corvette fuelie 2-1/2" manifolds. Any input is appreciated. Thanks

[chewychevy67]

I have looked into it and in a 4x4 yes it's easy. I have seen 2 2wd trucks done but it is extremely tight and good luck getting it off when needed. The bend is very tight right off the manifold.

[Grumpy old man]

There's plenty of room ,These are 2 1/2" rams, 350 in a 67 short bed frame.

[BCOWANWHEELS]

Room if youove engine n trans back

[Grumpy old man]

This was a L6 I removed the 6 manual cross member and installed a factory V8 stock manual cross member and used stock V8 engine mounts in the front holes, There's room for 2 1/2" pipes .

[BCOWANWHEELS]

6 and v8 mounts are the same - except rubber engine mounts - just in different locations. you use the 6 cyl location with a v8 and theres room but engine is back further

[BCOWANWHEELS]

I also polished n trimmed my 2.5 vette manifolds, it sure makes em look good

[Grumpy old man]

I'm just setting mine up in the stock location . would there be more room if you used the 6 parts on the 8 ,Sure but it fits using the stock V8 parts

LockDoc posted these pics last year .

http://67-72chevytrucks.com/vboard/s...d.php?t=732393

[BCOWANWHEELS]

that pic is priceless, thanks. I,d really like to meet you grumpy. I,am in Kingsport.

[special-K]

So, did any small block 2wd trucks come with straight dumps or were they all from 4wds? My experience is mostly with 4wds and I assumed all 2wds used curved. I have some manifolds I need to identify, curved/straight and with/without alt/ac mounts

[BCOWANWHEELS]

2wd is all curved

[OregonNed]

This a good article to look through on the subject. I contacted the author to confirm that the straight down Tru Ram manifolds fit ok.

http://www.hotrod.com/articles/1112c...et-c10-engine/

[BCOWANWHEELS]

those arnt gm manifolds...... in that article.

[weim55]

One other thing to think about, I don't know if the Vette left manifold has the alternator mount holes but if it doesn't you could run into an issue using the stock 67 C10 alternator brackets. If you're cylinder heads have both holes on the end you could use the 71 72 truck alternator bracket set up that bolts to the head that way keeping the original short water pump set up.

Steve weim55 Colorado

[Grumpy old man]

^^ That's what I did .

[special-K]

I got a set of Sanderson shorty headers from a member who had them on a C/10. I trust him, but does that sound possible? Would the engine have to sit back in the 6cyl mount holes?

[Grumpy old man]

Originally Posted by special-K

I got a set of Sanderson shorty headers from a member who had them on a C/10. I trust him, but does that sound possible? Would the engine have to sit back in the 6cyl mount holes?

If they are CC17's they will fit in the V8 location , A little pricey at $525.00

https://www.sandersonheaders.com/san...el-camino.html

[special-K]

These are block hugger style, center dump.

Also, when you guys smooth the manifolds, do you mean just all the nubs and such or do you take ones with cast brackets and cut them out and smooth?

[BCOWANWHEELS]

both

[Grumpy old man]

A few pics from a 7 year old thread on 2 1/2 install

http://67-72chevytrucks.com/vboard/s...=440965&page=2

[BCOWANWHEELS]

if you use tight mandrel bends and tig it all together you can do a nice job but it takes time, fitting etc. it also helps if you wrap the p/s pipe next to starter to keep heat soak out of it. there is no performance gain to 2.5 except for hi-compression engines. lastly make sure you can get starter off and on

[special-K]

Originally Posted by BCOWANWHEELS

both

Thanks again. I may smooth up on some old style ones I have if no one wants for original restoration.

[BCOWANWHEELS]

blast them inside n out then have them surfaced flat, then see if you have to elongate mounting holes then polish. bbq grill paint does real nice also