how do i make 302 hedas fit a 351w
04-20-2007, 06:53 PM
#2
Join Date: Jul 2006
Posts: 5
RE: how do i make 302 hedas fit a 351w
Tou put them on a 351w and torque the bolts to spec. My AFR 205 went from a 302 to a 351w no problem. Unless you have valve clearence problem the only difference is the bolt size you might need to bore out the holes on the heads to 1/2 inch.
04-20-2007, 07:05 PM
#3
2nd Gear Member
Join Date: May 2006
Location:
Posts: 236
RE: how do i make 302 hedas fit a 351w
351 head bolts and studs are 1/2
you have to have the bolt holes drilled out too, 1/2,
i recomend just taking your heads to a machine shop, tell them to take all the springs and valves out!! so they dont get any metal down in there, and tell them too drill them out 1/2'
im picky on who i let mess with my heads, so make sure its a good machine shop!!
and take your cam card with you, so they can set the spring pressure back up right.
or just tell them how you want them.
and when you get your heads back, look really close at the top of the spring to make sure the locks and retainers are in there right, sometimes they get in a hurry, and dont lockem down all the way.
and that can cause a major malfunction, like in a busted piston(scattered motor)
if they where iron heads, i would just say drill them out yourself, because you could drill through a magnet a little more than a 1/2' and stop every now and then and wipe the magnet off and keep drilling without any metal getting down in your heads. but alluminum... now way to keep all that stuff from flying everywhere.
but besides the difference in bolt holes, they should bolt right down on there, and work fine.
i recomend using studs and not bolts.
you have to have the bolt holes drilled out too, 1/2,
i recomend just taking your heads to a machine shop, tell them to take all the springs and valves out!! so they dont get any metal down in there, and tell them too drill them out 1/2'
im picky on who i let mess with my heads, so make sure its a good machine shop!!
and take your cam card with you, so they can set the spring pressure back up right.
or just tell them how you want them.
and when you get your heads back, look really close at the top of the spring to make sure the locks and retainers are in there right, sometimes they get in a hurry, and dont lockem down all the way.
and that can cause a major malfunction, like in a busted piston(scattered motor)
if they where iron heads, i would just say drill them out yourself, because you could drill through a magnet a little more than a 1/2' and stop every now and then and wipe the magnet off and keep drilling without any metal getting down in your heads. but alluminum... now way to keep all that stuff from flying everywhere.
but besides the difference in bolt holes, they should bolt right down on there, and work fine.
i recomend using studs and not bolts.
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