Head differences?
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From: Kiefer, Northeastern Okla
Head differences?
I've been shopping around for some E7TE heads, and ran across a place that sells rebuilt heads at a pretty good price. They've got "E7TE's for a 351" for $125, then they've got E7TE's "hipo for a 302" for $275. I'm aware of the difference in the bolt sizes between the two motors, but is there really a difference btween the two? Did they even make an E7 head specifically for the 302? If so, is it worth the $300 difference in price/pair? They've been tanked, mag'd, decked, etc., the price is outright, no core. BTW, these will be for a '79 302 rebuild, gotta get rid of the smog dogs.
TIA-Pete
TIA-Pete
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From: The hills of No. Calif.
That's the only thing I can think of that would be different, the seller must have done the typical E7 porting on the so-called "hi-po" heads. As far the castings, there's no difference. Either way would sure be an improvement over the stock '79 heads!
Of course, if you get the cheaper 351W heads, you have to budget about an extra $100 for the ARP bolt kit with the special washers.
Of course, if you get the cheaper 351W heads, you have to budget about an extra $100 for the ARP bolt kit with the special washers.
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From: Kiefer, Northeastern Okla
I don't think this place would take the time to do any port work, they're a high-production shop. I thought I would ask here first before calling them, to get a straight answer. Pud, you answered my main question, I wondered if they came on the 302. I've been practice porting on a junk E7 I got from my machinist, and reading a lot. I understand it's not just about the flow volume, but velocity as well, as relates to port shape and the short turn radius. I figured for the price, it would be a good learning experience, and all the major work is already done.
Thanks for the replies.
Pete
Thanks for the replies.
Pete
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If they are saying that E7's for 351's and E7's for 302 HO's are different, then the only thing I can think of may be chamber volume. 302 E7's had 64-65cc chambers I know for sure. This gives a nominal 9:1 compression ratio on a 5.0 HO. If a 351 was to use 65cc heads then the compression should be slightly more. If the 351 also had ~ 9:1 compression, then it would need more chamber volume.
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From: Kiefer, Northeastern Okla
Very good point, P51. It just seemed kind of strange that if they made castings with obvious differences, for two different engines, that they would have the same casting numbers. I don't mind paying a few cents more for premium fuel, so a little higher CR won't hurt, if that's what the 302 E7's give me. Plus, like Dan said, I could take the money saved on the special washers and apply them toward better roller rockers than I had planned. Another question- do either have OEM screw-in studs? My machinist quoted me about $100 to mill bosses for screw-ins and guide plates.
Pete
I love this stuff.......
On edit- I didn't mean it to sound like I would be saving any money if I went with the "hipo" 302's. I'm not much of a multi-tasker.....typing this and trying to act like I'm listening to what the wife is saying at the same time..
Pete
I love this stuff.......
On edit- I didn't mean it to sound like I would be saving any money if I went with the "hipo" 302's. I'm not much of a multi-tasker.....typing this and trying to act like I'm listening to what the wife is saying at the same time..
Last edited by petes79f150; Aug 21, 2006 at 09:45 PM.
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From: The hills of No. Calif.
They don't have screw-in studs exactly, Pete. They're pedestal-mount rockers. Crane has a kit for them that would be a little cheaper than converting to screw-in studs. And I believe they were the same heads between the 302 and 351, the difference being in the pistons rather than the combustion chambers.
Last edited by TigerDan; Aug 21, 2006 at 11:33 PM.
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From: durham bridge n.b., canad
Conaski mentioned that the stock valve size is 1.84/1.54 for E7TE heads. I beleive that is the valve size for the GT & GTP heads. I beleive the E7TE heads have 1.78/1.45 valves as all other 5.0/302 engines. With regards to the compression ratio of the 351 with the E7TE heads, probably kept lower with a dished piston. B.Hanson.
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From: Kiefer, Northeastern Okla
Actually, the valves are 1.74/1.46 on the stock E7's. www.thumperoforangepark.com. I got this link from another thread a while back, is one reason I was considering going with them. For a ported and flowed head, the Thumper heads sounded like a pretty good deal. But then I ran across those heads for $250/pair, and I figured with a little research, a lot of practice, and some patience, I could do it myself and learn something in the process. Another reason I'm considering doing it myself is that I've got access to a flowbench, and the guy will flow before and after for me. He needs some cabinet and trim work done on his house, and that's what I do for a living. Isn't the barter system great?
