gmc Motorhome headers?

[Matt15]

I been searching for a while...I'm wanting to know if the gmc 455 headers can be adapted to a 1970 toronado. I don't mind having to cut the collector but I don't want to go modifying the primary tubes.

Surely someone has adapted these and if so what modifications were needed..?

cheers.

[Eightballz]

check out this thread..someone adapted those headers on a 1971 toronado

viewtopic.php?f=7&t=1510

[Matt15]

check out this thread..someone adapted those headers on a 1971 toronado

viewtopic.php?f=7&t=1510

Will there be any engine bay differences or clearances from a 1971 to a 1970?

[Eightballz]

hard to explain.

the main difference will be firewall and the frame crossmember where the transmission mounts. on a 1971 the downpipe goes between the firewall and the crossmember, while on a 1970 theres not enough clearance so the downpipe needs to have steeper angled curves like two 90° turns and it routes below the crossmember. on a 1971 its like two 60° degree turns.

you'll need to fabricate your own headers but the motorhome headers are a good starting point. you could get them and modifiy till they fit. would make a great project and some guys on here would be really excited about it (like me).