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Best heads for 302
#1
Just joined the forum today, I've got a '71 Mustang with the original 302 and an AOD trans in it. It's already got and Edelbrock Performer intake and Holley 750 on top, I was thinking of putting on some new heads (and headers/exhaust) for more flow and better power. Just wondering what I should look into. I'm looking for something I can find fairly cheap, like other stock heads, but I'm not sure what to look for. I'd like to keep the stock cam because it's so smooth, I just want a little more power out of the engine with some better flow. I heard that 351W heads are a good option, but I want to get some other opinions.
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#2
http://diyford.com/choose-heads-small-bl...d-rebuild/#
see if that info helps u.. and that 750 carb is way too big for a 302.
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#3
(09-26-2017, 01:41 PM)delawarebill Wrote: http://diyford.com/choose-heads-small-bl...d-rebuild/#
see if that info helps u.. and that 750 carb is way too big for a 302.

Thanks, that's definitely a step in the right direction. It looks like there are a bunch of gt40 and gt40p heads on craigslist right now. Not too many other options apart from a set of Victor JR's. Should I go for one of these or hold out for something else? 

BTW, I decided on the 750 to pull less vacuum for a firmer brake pedal. Runs way better than with the 450 it had when I got it. Might be a little big, but I like it.
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#4
There are also a couple sets of E7TE heads for really cheap, complete with rockers. Are these any good? They're not on that website
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#5
Welcome to the forum from Iowa. I will reiterate that the 750 carb is too big. Especially with a stock cam. While swapping heads and adding headers will create a bump in power you might want to rethink your decision on the cam. Heads and headers that flow more are still limited by the cam, no change in the duration or lift will still result in pretty much the same flow rates as with your stock heads.
'73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, 750 CFM double pumper, Holley Street Dominator intake.

'73 F code convertible. Bright red. Needs total restore. (IE HOT MESS)

- Jason
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#6
Stock 302 heads from the early 70's aren't bad. I think 351W heads are not worth the trouble. If you feel the need to change them, try and go aluminum and look for smaller chambers to increase your compression and save some weight.

If you are not increasing compression, then any power gains are going to be minimal.
[Image: 1_01_07_15_8_53_18.png]

"I love my Hookers!" and "Get some Strange" probably have a different connotation to non automotive enthusiasts!
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#7
(09-26-2017, 02:53 PM)73pony Wrote: Welcome to the forum from Iowa. I will reiterate that the 750 carb is too big. Especially with a stock cam. While swapping heads and adding headers will create a bump in power you might want to rethink your decision on the cam. Heads and headers that flow more are still limited by the cam, no change in the duration or lift will still result in pretty much the same flow rates as with your stock heads.


Ok, I'll definitely think about a cam to go along with it. It's my daily transportation though. So I don't want to do too much at once because I still have to drive it
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#8
You are probably going street. When we use to build really hot 289 engines very high compression was the key. We had 14 to 1 and the guys would go over 10,000 rpm with them. Did not use head gaskets at all. If you are going to run higher rpms be sure you have screw in studs. If you go with double springs and high lift cam, Screw in studs.
With high performance come high failure. Racing parts do not make an engine last longer usually very short life, lol. One of the first things you should buy is RPM limiter. Broke valves from over rev. will kill you before you can react. You can get MSD and others with it built in. That is the weak point in most engines is valve float, broke valve then split piston and blown to bits.
BTW welcome to the forum from North Carolina.

When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#9
This should help, it looks like the E7 has more potential, when ported, than the GT40, but the stock GT40 is better than the stock E7.
http://www.corral.net/tech/powerplant/head_tech.html

+1 on 750 being too big, and +1 on a cam upgrade. You can get a cam that will boost performance but still be good for a daily driver.


“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#10
http://www.alliedmotorparts.com
ck this company out too.. i got a pair of heads from them this yr. they were really nice and i asked for '71 heads and he looked for them. said he had a pair on the shelf ready to go. and i got them in 3 days. the shipping box converted to a return shipping at NO extra cost to me...
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