heads and compression????
Thread Starter
|
Junior User
Joined: Feb 2004
Posts: 70
Likes: 0
From: Illinois
heads and compression????
I have d3ve heads and I am wanting to get to 12:1 compression. My block is bored 60 over and I have the TRW domed pistons. How much do I have to get to 12:1. Mill the heads, but how much? Anyone know. Thanks
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
well first thing we need to know is how many CC the dome is? second how close to the deck the piston is (not the dome but the flat part of the piston) without those 2 figures there is no way to calculate what is needed.
Freshman User
Joined: Jun 2006
Posts: 38
Likes: 1
From: Texas
I think the dome on the forged TRW/Speedpro 460 pistons is in the neighborhood of 12(ish) CC's. Because of deck height changes over the years, the year your 460 block was made is also a factor when figuring the static compression ratio.
Junior User
Joined: Dec 2005
Posts: 59
Likes: 0
94.7 to 97.7 according to my 1980 shop manual. I measured mine and found the largest to be 99 due to corrosion (this engine sat around unused quite a while). I used my die grinder to even them up to 99.
KB 137 pistons have now given me about 9.5:1 CR
KB 137 pistons have now given me about 9.5:1 CR
Hotshot
Joined: Dec 2003
Posts: 18,423
Likes: 9
From: iowa
Ok using some assumptions here, 12cc dome, nominal 95cc heads, and the pistons at zero deck you have approx 11.33:1. To get to 12:1 you would need to get your chambers down to 89cc (if the other figures are correct lke zero deck and 12cc dome) it takes approx .006 per CC on these heads so you would need to take off .036. I would just go with .035 and you are going to be in the ballpark.
Trending Topics
Freshman User
Joined: Jun 2006
Posts: 38
Likes: 1
From: Texas
If your shooting for the 12:1 neighborhood, a combo using a TRW flat top, zero deck height, and the early, smaller combustion chamber head (C8,C9,Dove) would give you a lighter piston/better flame travel combo without the dome.
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
Thread
Thread Starter
Forum
Replies
Last Post
cws10190
1973 - 1979 F-100 & Larger F-Series Trucks
11
Dec 15, 2012 11:13 PM
73 ford guy
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
12
Sep 8, 2010 07:56 AM
76f1390
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
21
Feb 11, 2004 12:26 AM
bigred
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
6
Feb 14, 2001 04:47 PM
