Tango's Ultimate Hot Rod House

Members Login
Post Info TOPIC: first time fe build


Veteran Member

Status: Offline
Posts: 25
Date:
first time fe build


i bought a truck a while back with a 390fe and c6 trans with a shift kit. i was told by the man i got it from that he was building it for a stang project and was told it had less than 1000 miles. i just got around to taking it apart to check if he was blowing smoke or what. upon purchase i knew it had a holley 4 bb and an aluminum holley street dominator intake and it ran fast and strong. upon taking it apart it seems the heads have been rebuilt it has aluminum pistons and and i belive it is bored .o2o over. the only problem is the pistons seem a bit low when at tdc maybe an 1/8 this is the only thing that dissapointed me about this 390 what can i do about the pistons.furious

Attachments
__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Veteran Member

Status: Offline
Posts: 25
Date:

Yeah it was a very good runner I didn't see the need for a compression test at the time. I took it apart because I never trust a strangers word on a motor and only rewinds sometimes. But the way I see it if there is room for improvement nobody ever complained about faster and more power. Even if it is a small gain I would like to see if there are any other options. Relatively cost effective ones but w are talking Fe "f@#$ing expensive" is there any other piston that will close the gap or a good piston for this motor that will raise compression. Thank for the input.

__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Veteran Member

Status: Offline
Posts: 25
Date:

I believe that the heads are the low riser heads and they are 76cc I think from my reasearch. So with the larger chamber and with the slightly low piston I should be able to shave the head and use the steel shim gasket I think. Thanks for the advice. I will try and work on the rest of the numbers to be sure. I am open to any ideas thanks.

__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Veteran Member

Status: Offline
Posts: 25
Date:

Is there any way to tell on these motors if the can has been changed without removing it. And when you say bleed off are we talking about the exhaust having more time to get out or the pressure in the hydraulic lifters.

__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Veteran Member

Status: Offline
Posts: 25
Date:

I have found some specs on my piston it says approximately 9.5 CC head recessed in cylinder 3/32 but the CC will be slightly more because of. 020 over right? It also says compression ratio of 8.2 I think I will want to improve that a bit.

__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Veteran Member

Status: Offline
Posts: 25
Date:

Ok so these are the numbers that I came up with after a little more checking
Bore 4.070
Head 72cc
Piston 9.5cc about
Head gasket .060
Recessed piston down 3/32
I think with these numbers I can pick up a bit of compression.

__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Veteran Member

Status: Offline
Posts: 25
Date:

Thank you for all your help dennyw that should make a noticeable difference can't wait to get it together the rest of the way and drop it in. And I am thinking of finding a cam for it just to liven it up a bit more. Should be a decent ride thanks again.

__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Veteran Member

Status: Offline
Posts: 25
Date:

Nice site looks like they can take care of just about every gasket need. Can't wait to order me a set looking forward to seeing this 390 at a higher compression. Thanks again

__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Ford Tech

Status: Offline
Posts: 286
Date:

Cometic makes a nice head gasket. I've never used them but have heard raves from those who have. Somewhat expensive @ $200pr. I only see .040 thickness in the std FE gasket section. The oem Ford 427 shim gaskets came in both plain steel and stainless steel 4.390 bore size. Plain steel at .015 and the stainless at .017. Fitzgerald was the original company Ford contracted to make them. Original design for the hipo 427 gaskets were a specific right and left side application. As they wick coolant on the deck surface of the block. Other than the right and left application both gaskets are identical and have the same rolled reinforced compression ring. DSC sells the steel .015's for $30 a pair. Made by Fitzgerald. The stainless version hasn't been around for some time. I found a NOS set of the R&L stainless gaskets over the winter. I've been looking for them for many years. I about gave up and was going to use the plain steel ones I have. Mr Gasket sells a .018 steel embossed gasket with a smaller bore size (4.280 I think?). Not as good IMO as it does not have the rolled compression rings. Ford also made and used other standard embossed type gaskets like the Mr G's. But I've only used the 427 style. I have reused them too!

DSC website..... www.dscmotorsports.com  in the gasket section.

__________________


Ford Tech

Status: Offline
Posts: 286
Date:

I should also add I've heard of guys having problems with the steel shim gaskets weeping or leaking. With cause due to improper/uneven head and block deck surfaces. I have used silver spray paint on the plain steel version, spray them and install when tacky to touch. I also do 5 ft lb increments on the torque values. After a few heat cycles I retorque them and been ok.

I've also read guys using the Cometic head gaskets have been able to reuse them. While somewhat expensive they say they are the best. Nice to know they can do custom gaskets and already have quite a few patterns for some of the harder to find stuff.

__________________


Veteran Member

Status: Offline
Posts: 25
Date:

Yeah I took a look at the cosmetic site and I think I will go and order a custom set
In my experience I have almost always found you get what you pay for especially when it comes down to the little things. I wish I could use the steel gaskets for the 428 but the bore is little to big for this motor.


__________________
nothing like the satisfaction of hearing your hard work rumble!!!


Administrator

Status: Offline
Posts: 8468
Date:

I use the Fel-Pro steel shim .015" Gaskets on Street/strip SB Chevys . They have a Black coating on them . But from what I know they don't make them fore BB Fords . I have also used thin steel G.M Shim Gaskets and paint them with Hi Temp Silver Paint . Make about 3 coats on them even done that on H/C Diesels nod.gif The Good Silver Paint had some aluminum pigment in it .

__________________

I cannot think to leave you now . For that alone I still fight on .

Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard