E5 heads compared to E7s

[Guest]

[junkyardjeff]

Bought some 351 parts to get a Duraspark distributor and a pair of E5 heads came with it,the E7 heads that came on the motor I have have some bolts broken off in them so I was wondering if they are similar to the E7s or should they be thrown on the scrap pile.

[juiced coupe]

http://sbftech.com/index.php/topic,1268.0.html

Other than combustion chamber size, they are pretty much the same.

The E6 heads are the ones to avoid.

[junkyardjeff]

The E5 heads look to have the same valve size as the early 70s heads,I knew there was a set  made in the 80s to avoid but could not remember what ones.

[CDW6212R]

The E5 heads look to have the same valve size as the early 70s heads,I knew there was a set  made in the 80s to avoid but could not remember what ones.

Ditto, the 1986, smaller chamber and deeper dished piston, same 9:1 compression, E6 heads.

[junkyardjeff]

It looks like those E5AE heads have really large combustion chambers,after looking at those charts I should have put some E7 heads on the 70 302 I have to drop the compression some since it has around 9.5 and is almost too much for todays regular grade gas.