too much carb....
289 build
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289 build
i have a 289 bottom end is all standard i will be running a 470 lift cam with a holley 750 dual line vac.secondarys.what type head should i go with the stock 58cc 289 or something else.i have a set of 302 dooe that are rebuilt would this be a better combination or maybe a set of the gt-40p heads? the 302 heads are dooe-b.
Last edited by olered53; Nov 23, 2005 at 08:33 AM.
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From: The hills of No. Calif.
I agree, a 600 cfm would be much better. Holley 1850 for the 600 cfm vacuum secondary carb.
Those DO0E 302 heads aren't anything really special, but if you've already got a good set of rebuilt ones you could use 'em. The GT-40p heads would be more interesting for that motor, but be aware that you could have some exhaust issues. The P heads have oval exhaust ports rather than square, and the spark plugs are relocated which can cause some clearance difficuties with some headers. There are P-specific headers available but not for every vehicle application. Some fabrication may be in order.
Those DO0E 302 heads aren't anything really special, but if you've already got a good set of rebuilt ones you could use 'em. The GT-40p heads would be more interesting for that motor, but be aware that you could have some exhaust issues. The P heads have oval exhaust ports rather than square, and the spark plugs are relocated which can cause some clearance difficuties with some headers. There are P-specific headers available but not for every vehicle application. Some fabrication may be in order.
Last edited by TigerDan; Dec 2, 2005 at 08:35 PM.
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o.k. what if i use edelbrock 600cfm carb,i have never had much luck with the holley 1850 carbs. the heads one is just as good as the other is that what you mean,between the dooe-b and the stock 289 heads. .
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The Edelbrock would be fine too, it's really just a matter of preference. I've always ran the Holley so I'm more familiar with it. The Edelbrock is harder to set up, but once you get it dialed in it's supposed to be the better carb.
You have some trade-offs between the 289 and those 302 heads. The 289 heads have smaller chambers for more compression, but smaller valves as well. You would lose a bit of compression running those 302 heads on a 289. They have a 58.2cc chamber and would that would drop you about five points of compression over the 289 heads.
You have some trade-offs between the 289 and those 302 heads. The 289 heads have smaller chambers for more compression, but smaller valves as well. You would lose a bit of compression running those 302 heads on a 289. They have a 58.2cc chamber and would that would drop you about five points of compression over the 289 heads.
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o.k. tiger,what would be the biggest valve i could have the heads machined out for 1.94 in.& 1.60 ex. would that help the performance of the engine.also i used to have a ad out of fastfords&mustangs of a company who sold these heads already set up with the bigger valves . do ya know maybe who it was,or any ideas.
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Don't know who that was, there were (are) probably quite a few companies who do that.
Yes, 1.94/1.60 are just about the largest practical sizes that you can stuff in a stock Ford head. Some people have gone to 2.02/1.60, but the seat area between the valves gets awful thin and the valves dang near touch.
Any competent machine shop should be able to handle that. I have a set of C5AE heads that have 1.94/1.60s, screw-in studs, and major port work. They were done by a company out of L.A. called Cylinder Head Engineering. They flow...real nice!
Yes, 1.94/1.60 are just about the largest practical sizes that you can stuff in a stock Ford head. Some people have gone to 2.02/1.60, but the seat area between the valves gets awful thin and the valves dang near touch.
Any competent machine shop should be able to handle that. I have a set of C5AE heads that have 1.94/1.60s, screw-in studs, and major port work. They were done by a company out of L.A. called Cylinder Head Engineering. They flow...real nice!
Last edited by TigerDan; Nov 24, 2005 at 01:33 PM.
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ok tiger dan help i found a holley 600 in the garage i forgot i had im going to rebuild it what size jets do you recommend.the list # is 1850-2, 0506 under the list # also the cam i am going to use is a .444 lift im leaving the stock heads with a valve job and new seals.
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From: The hills of No. Calif.
A good starting point would probably be #64 jets. You need to have fresh sparkplugs in the motor and a good idea of how to read them. Rule of thumb is to change 2 jet sizes at a time, so if the 64's are too lean you would jump up to 66's. There are a lot of variables besides the cam, including the manifold, the exhaust system, the RPM range you operate in...
Also, you need to size the accelerator pump squirter and the vacuum secondary diaphragm spring. If that spring is too soft the secondaries will open too soon making the engine bog. Then there's the power valve...
Kind of difficult to tune a carb over the 'Net, too many variables and we can't physically see and hear what's going on. But see what size jets you have in there now. Here are the stock specs:
LIST# - 1850-2
TYPE- 4160
CFM - 600
STOCK JETTING - (Front)66 (Rear)plate 134-9
POWER VALVE -6.5
Also, you need to size the accelerator pump squirter and the vacuum secondary diaphragm spring. If that spring is too soft the secondaries will open too soon making the engine bog. Then there's the power valve...
Kind of difficult to tune a carb over the 'Net, too many variables and we can't physically see and hear what's going on. But see what size jets you have in there now. Here are the stock specs:
LIST# - 1850-2
TYPE- 4160
CFM - 600
STOCK JETTING - (Front)66 (Rear)plate 134-9
POWER VALVE -6.5
Last edited by TigerDan; Dec 2, 2005 at 08:57 PM.
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no these are a different set they have all new parts the valves im pretty sure are 1.96/1.60 they are almost touching,there bigger than the dooe set and the stock 289.i found these on ebay listed under the oil pans in the engine parts.lucky me was the only bidder and won with the starting price 650.00. here is the ebay number 8020186137 he didnt have any pictures in the ad the picture that i got in email just showed the casting #'s and valve spring cups.i also stepped up to a ford cam part # fms-m-6250-a312 duration 290/300 lift .472/.496 hydraulic.
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