im thinking of going to the junk yard and getting some e7 heads i now have d7oes on my 79 302 with a edlebrock peformer intake a 470/470 lift 218/228 duration cam holley 600cfm carb bbk headers and a .60 overbore.how much power am i looking at by going to e7 heads over the low compression d7oe heads?

 

HP is more about airflow than compression ratio, so it probably won't make a hugh difference if you leave them stock. Give te E7s a good porting job before you install them and that will make it worthwile.

 

Sort of off-topic, but I noticed your .060 over. I suggest you have the cylinder walls sonic tested for thickness, especially on the thrust side. .150 is a good rule of thumb for a 302, because the deck and main webs are closer together than say a big block, where the support at the bottom of the bores can get thin and be prone to cracking. Overheating can also become a problem, causing hot spots on the walls from the combined heat of adjacent cylinders.

What year is your block? If you have the option, I suggest a Mexican block, or one from '68- early '70's, then '87 and up, avoiding anything in between those years, with that overbore.


Pete

 

They are probably worth 15 horses.

Take a 5.0L Crown Vic vs a 5.0L Mustang. The Crown Vic had 150hp in SEFI form, the Stang had 225hp. The differences were in the cam (both rollers), exhaust manifolds, upper intake, throttle body, and heads. The rest was identical (except the pistons, HO got forged, lo-po got cast, no power difference).

We have 75hp buried somewhere in there. The HO cam is beefy for a stock grind, so we'll say it's worth 20hp. The induction is worth, mmm 20hp. The exhaust manifolds are 10hp. That leaves us the heads for 15hp. That's about how much you'll gain.

 

yeah but im running the d70e heads with a 470/470 218/228 cam so say with hat cam and e7 heads i should get more hp cause e7s flow better right ??
well ive neve ported heads before maby ill get some e7tes and port the ex sides then how much hp should they be worth .thanks

 

The Crown Vic had flat tappets, not rollers, same upper intake with a smaller TB and a choked down air inlet hose. It also had a more restricted exhaust system as well as less aggressive timing and fuel curves and smaller injectors. 14lb vs 19lb.
The roller cam HO 5.0's came in Mustangs and Licoln Mark VII LSC's.

 

A friend of mine put new gaskets and seals on his 86 Crown Victoria. It had a factory roller cam and it is the stock engine. E6SE block and E6SE heads.

I don't think they got the same intake. My '88 Mustang intake has H.O under the name plate (60mm bore all the down) and his 86 Crown Victoria doesn't have the H.O (50mm bore all the way down).

 

LxMan1, you are right on the injectors being different sizes and the timing events/engine program being different. I forgot about that. But they did get a roller cam from 1986+, which happens to be when they also went to SEFI for the 5.0L cars. You may be thinking of the 351W cars that never got a roller cam (1991 was the last year the 351W was used in the Panther platform, still a few years from roller 351W's)

51dueller, you are on the right track. The upper intake was different to match the 50mm TB, the but the lower was the same.

 

I know the 86 T-Bird/Cougars were not roller, I have one of those apart. I've never been into an 86-newer CV so I figured they were the same as the T-Bird/Cougars. My mistake.

 

The HP difference between the E6 and E7 heads was 25 hp. The Vic 5.0 SEFI intake was slightly different from the HO intake. Huge difference in cam specs between the two (roller to roller) As for the difference between D7 and E7 heads, that I can't tell you, but it's less than 25 hp. Might do better just milling the D7's to raise the comp ratio.

 

Take that van to a dyno and see what you have....then port the E7's and retest it....

 

ok thanks guys

 

According to Sealed Power/ Federal Mogul's listings Mustangs went roller in 85, Marks in 86, T-birds/ Cougars in 91, and Crown Vics were never roller. Also the roller engines listed all use the same cam. But it is possible that the listing is wrong.

 

It's wrong on the Crown Vic's. The T-Birds I wouldn't doubt. They didn't use the 5.0L in '89-'90. My mom's '87 5.0 built in December of '86 has an E6SE block, while my '87 CV built in April of '87 has an E7TE block.

 

That whole statement is wrong. Stang went roller in 85, the other cars started with 86, the pickup/van 5.0 got roller in 92, 351 in 94. There were 4 basic cams used. GT/HO roller, "Base" roller (smallest of the lot, used in the std 5.0 in the full size cars and the 92-93 pickup/van) , The GT40 roller for the 93-95 Cobra, and the F4TE roller in the 94-up pickup, van, Exploder/Mountaineer 5.0. In all this the GT/HO roller was revised three times, but was basically the same cam