Head combo
Thread Starter
|
Elder User
Joined: Feb 2004
Posts: 835
Likes: 0
From: Fort Rucker, AL
Head combo
I have a mixmatched set heads and looking at compression possibilities. I have one C6AE-R and one C7JE. The ports are the same size but I didn't pay attention to the combustion chambers. The intake ports have been polished, the exhaust ports hogged out. .002 shaved off the heads. I have read that they are pretty much the same head but looking in the book, there's a CC range given. What causes fluxuation in head CC's? Why can't they say that this or that head has 68cc instead of 68cc-72cc? Anyway.
This is what I'm doing. I already bought the 343941 cam, it's in my garage.
I am looking at buying some 10:1 pistons. Short of calculating head volume (which I will do when I pull the heads again), do you think I'll have pinging problems, even if I actually get close to 10:1?
I'm just asking these questions so I can regroup if need be.
Thanks, yall
This is what I'm doing. I already bought the 343941 cam, it's in my garage.
I am looking at buying some 10:1 pistons. Short of calculating head volume (which I will do when I pull the heads again), do you think I'll have pinging problems, even if I actually get close to 10:1?
I'm just asking these questions so I can regroup if need be.
Thanks, yall
Elder User
Joined: Nov 2003
Posts: 936
Likes: 0
What do you use your truck for? I know a lot of the guys on here like the Crane 941 cam and it does look like a good cam for most all around purposes but... I know Rusty has had some pinging problems with his engine that has that cam and the 360 (Hi-Po 390) pistons but that may have just been a problem with his fuel injection setup. The 941 has more than enough lift but you may want to look into a cam with some more duration.
Needsmorecoffee.
Joined: Oct 2004
Posts: 3,624
Likes: 2
From: CT
And because head castings can vary the cc's listed most of the time are just a range to work within. I have a set of lowriser heads that's listed as having 64-67 cc chambers and they turned out to be 69 cc's. Heads are all original. Some others have been within the cc listings I've used so you can see this is just a general guideline. Being the two castings you have are pretty much identical it would still be a good idea (and interesting) to compare the two. I'd be curious myself and please post the readings if you choose to check them. G.
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Well guys, it wasn't the injection! Read my post in "Rusty, you pingin yet?" and take a look. I put the Holley 600 vacuum secondary back on and it didn't help a thing. Then again, I have other problems that are probably contributing factors. I'm confident I'll get it sorted through.
Elder User
Joined: Nov 2003
Posts: 936
Likes: 0
You could fatten up your mixture (richen) but then that is just kind of a band-aid because rich mixtures cause carbon buildup which can and will contribute to more pinging. Maybe try some of that Evans waterless coolant, it is supposed to help with pingin and detonation. Kurt, what is your distributor set-up like? I am pulling for you guys in hoping this isn't the cause but I think ya might possibly need a cam with a little more duration...
Thread
Thread Starter
Forum
Replies
Last Post
bubbaf250
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
37
Nov 7, 2014 06:54 AM
JimNolan
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
1
Jan 31, 2010 06:31 PM
JimNolan
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
8
Jan 26, 2010 05:47 PM
76 F250 4X4
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
4
Nov 29, 2003 07:19 PM
