I am swapping a 305 for a 400 and they told me the 305 exhaust manifold will not connect with the 400 and i should get headers. Any suggestions on what my options are???

 

I dont know why the 305 exhaust manifolds wont bolt to the 400 heads, but the best exhaust for an engine of that size would be hooker long tube headers, or SLP 1 3/4".

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Hooker longtubes, 1 3/4"

 

Thanks,are they expensive?

 

The reason the stock exhaust manifolds won't fit on the older heasds is because the passenger side head has the rear most bolt hole farther to the rear of the head...not symetrical (sp) like the exhaust bolt holes of the older heads........check the rear most exhaust port of the passenger side of both heads....you'll see what I mean.......


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84 Z-28 hugger orange(pearl) w/pearl white racing stripes, 406 sb with AFR heads, Hooker Super Commp 2210 headers, Comp Cam 270 magnum, TRW forged pistons, MSD ignition, Edelbrock "Smokey Ram" intake w/ Holley 750 cfm dbl pumper, "built" turbo 400 trans, Hotchkis lca, panhard bar, Bell Tech dropped spindles/rear lowering springs, Alston SFC, 16" chromed IROC wheels/bfg 245x50 frt, 255x50 rear tires, Harwood 'glass hood w/ 3" rear scoop, '90 "Z" front facia.....and it's not finished!