5.8 heads on a 5.0

marq.fcb · Feb 10, 2012

is it possible to replace stock 5.0 heads with 5.8 without big modification, just "plug and play" ?

Bill94vert · Feb 10, 2012

no...deck heights are different requiring 351 intake I believe this is all. OH yea and headers are different as well

5.0kid · Feb 10, 2012

they are actually the same in regards to height i believe, but it isn't really worth it. They also do have larger head bolt sizes so you have to get the inserts for that too. get a set of gt40 heads for a pretty cheap boost!

Paul · Feb 10, 2012

There is no significant difference between a "5.0 head" and a "5.8 head." They're all the same except perhaps for the size of the head bolt holes which can be accommodated by simple head stud/bolt spacers.

The 5.0 tech in this place has gone to shit.

Paul.

96TANGERINEGT · Feb 10, 2012

I know people that have run 351w heads oh 302 blocks . Small block is a small block its bore and stroke thats different . Oh and head bolt size . If u look up a intake they say fits 289,302,351w . I am almost positive .

86svo9l · Feb 10, 2012

351w and 302 share heads, the 351 heads are drilled for bigger bolts so no advantage at all. The only exception to this are the early 351w heads from the 60's-mid 70's, they will indeed have a slight flow advantage stock vs. stock but the cost of modifying them to work would be the same as just having purchased a worked set of gt40s or aluminum. This was popular to do before the aftermarket scene took off but just is not worth it anymore.

96TANGERINEGT · Feb 10, 2012

5.0kid said:
they are actually the same in regards to height i believe, but it isn't really worth it. They also do have larger head bolt sizes so you have to get the inserts for that too. get a set of gt40 heads for a pretty cheap boost!

Yes gt40 heads r bad ass for stock heads I had 93 cobra heads with a full port chopped down to about 58 cc chambers .

rz5.0 · Feb 10, 2012

Paul said:
There is no significant difference between a "5.0 head" and a "5.8 head." They're all the same except perhaps for the size of the head bolt holes which can be accommodated by simple head stud/bolt spacers.

The 5.0 tech in this place has gone to shit.

Paul.

thats why you should be the moderator....

Mustang Mark · Feb 10, 2012

rz5.0 said:
thats why you should be the moderator....

i second this motion

Mustang Mark · Feb 10, 2012

Paul said:
There is no significant difference between a "5.0 head" and a "5.8 head." They're all the same except perhaps for the size of the head bolt holes which can be accommodated by simple head stud/bolt spacers.

The 5.0 tech in this place has gone to shit.

Paul.

i agree. im a modular guy and i have to give better tech than most of the guys here...

Bill94vert · Feb 11, 2012

lol I stand corrected I will keep my "shit" to myself

rz5.0 · Feb 11, 2012

It happens.. Sound like your talking about the 351 block it self.. I made the same mistake on another post... Tought he was talking the whole 351 swap but was only talking about the heads..