Head information needed
Thread Starter
|
Posting Guru
Joined: May 2012
Posts: 1,271
Likes: 9
From: Franklin, IN
Head information needed
I just picked up a fresh set of F3JE heads for cheap and was wondering what kind of performance potential theses have. I know they are a marine head but that's as much info as I can find.
Senior User
Joined: Jan 2013
Posts: 290
Likes: 0
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
F3ZE heads flow about 30% better than E7TE heads and if you were to bolt them on your '81 302 you would gain about 1 point in compression ratio.. 8.2 to 9.2:1. Add a mild cam and headers and you could have a 300hp motor.
Thread Starter
|
Posting Guru
Joined: May 2012
Posts: 1,271
Likes: 9
From: Franklin, IN
The info posted by Oldman indicates that the heads I have are functionally the same as the F1ZE. The plan is to do a simple gasket match and grind out the thermactor bumps and bolt em on inplace of the D6s I have now and stab in a new cam.
Conanski, what would be the approximate CR be with my current flat tops.
Conanski, what would be the approximate CR be with my current flat tops.
Thread Starter
|
Posting Guru
Joined: May 2012
Posts: 1,271
Likes: 9
From: Franklin, IN
Correct, the short block was purchased from a local guy and had been recently rebuilt with forged flat tops. Three years ago my plan was to put a SBF together for the '81 but my wife got pregenant so I tossed on the D6 heads and 2 barrel intake.
Trending Topics
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
Ok so existing compression ratio with D6 heads wouldn't be quite a low as it would be with the stock pistons but the end result with the GT40 heads will be about the same or around 9.2:1.
P.S. Don't gasket match the heads leave that to the Chevy guys that don't know any better, if you do anything check the head/intake ports for misalignment in their as-assembled position and grind where necessary to make them match better. It's pretty much a certainty that the port openings in the heads will be larger than the exits in the intake and you will have to open up and align these and not touch the heads at all.
P.S. Don't gasket match the heads leave that to the Chevy guys that don't know any better, if you do anything check the head/intake ports for misalignment in their as-assembled position and grind where necessary to make them match better. It's pretty much a certainty that the port openings in the heads will be larger than the exits in the intake and you will have to open up and align these and not touch the heads at all.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Freshman User
Joined: Jul 2014
Posts: 49
Likes: 0
From: British Columbia
LOL sorry to but into someone else's thread but i'm in need of a little head advice and you guys seem to know what your talking about, i was curious on what models and years ford produced the gt-40 head and could they be used on a carb'd 351w and if not what would work well with an Edelbrock "street master" manifold with a 780 Holley??????????? thanks
Hotshot
Joined: May 2003
Posts: 11,141
Likes: 25
From: south louisiana
You're not going to see a one point change in the comp ratio from a 4 cc reduction in the chamber size on a 351. More like 3 tenths difference.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
D6 heads would have 69-70cc chambers while some GT40s would be about 60cc.
Elder User
Joined: Mar 2013
Posts: 847
Likes: 4
From: In my house..
Laughing Gas
Joined: Dec 2012
Posts: 801
Likes: 7
From: Toledo, Ohio
LOL sorry to but into someone else's thread but i'm in need of a little head advice and you guys seem to know what your talking about, i was curious on what models and years ford produced the gt-40 head and could they be used on a carb'd 351w and if not what would work well with an Edelbrock "street master" manifold with a 780 Holley??????????? thanks
http://www.summitracing.com/parts/wrl-053040/overview
http://www.competitionproducts.com/S.../#.U8kFaDbD-Uk (ask if can get for SBF)
Thread
Thread Starter
Forum
Replies
Last Post
verch101
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
7
Mar 8, 2011 04:03 PM
TheNomad
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
2
Jul 9, 2008 08:27 PM
jimmyk57
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
5
Apr 27, 2003 06:47 AM