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Author Topic: E5 heads compared to E7s  (Read 1208 times)
junkyardjeff
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« on: April 15, 2018, 05:19:49 pm »

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.
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juiced coupe
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« Reply #1 on: April 15, 2018, 05:45:45 pm »

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.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
junkyardjeff
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« Reply #2 on: April 15, 2018, 05:51:35 pm »

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.
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CDW6212R
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« Reply #3 on: April 15, 2018, 10:47:17 pm »

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.
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Don

1991 Mark VII LSC Special Edition, soon to be OBDII and 4R70W, then GTC body kit and 347.
1998 Mountaineer, plans for A4WD and KB 2200 blower later, XP8 parts, paint and a 332.
1973 Ranchero and 72 Sport front end ...will be a 351 Clevor, EFI and 4R70W.
junkyardjeff
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« Reply #4 on: April 16, 2018, 10:38:18 pm »

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.
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