Head gaskets--Fel-Pro or Cometic
 

Please only answer this poll /question if you have had personal experience with the listed gaskets. I have a Gen 6 502 with a Whipple charger. Running up to 8 lbs boost. I am using ARP studs for aluminum heads.

Thanks

Re: Head gaskets--Fel-Pro or Cometic
 

2nd waterhole?? i am in process right now and i would like to know what we are talking about with this.

Re: Head gaskets--Fel-Pro or Cometic
 

I prefer the Cometic, especially on a blower motor. The part #for these gaskets is C5333.

Re: Head gaskets--Fel-Pro or Cometic
 

Fel-pro is now offering the same gasket that Cometic uses,
Strip is using them on his motor project if you want a picture of them.

Re: Head gaskets--Fel-Pro or Cometic
 

Had great luck with cometic and 7lbs of boost,I would not use anything else. :D

Re: Head gaskets--Fel-Pro or Cometic
 

You need to be carful with head gaskets. On the Gev 4 stuff the holes GPM is talking about is open to allow more flow. Its been a while since I've seen a a Gen 4 block but I seem to remeber they do not have that second lower casting hole on the front of the block. I never thought of what GPM is saying but it makes great sense on a blower motor. What you absolutly do not want to do on a Gen 5, 6 block is open the front water passage. That block has a big casting hole, if not blocked by the gasket, will allow water to short circut the head. Water will enter the front of the block go throught the head and right out the intake not causing any water to go through the back of the head. To open the rear hole, you must have a right & left gasket.

If Comectic makes a gasket that does this, it would be great for blower motors. GPM, can you find a part number or is it custom? I now someone doing a blower with Cometic now.

Re: Head gaskets--Fel-Pro or Cometic
 

Cometic is the way to go, the only Fel-pro gasket I use on blower application is 1012 which a receiver groove has to be made on the head to mount this gasket for extra support.

Re: Head gaskets--Fel-Pro or Cometic
 

GPM,
Thanks, that is perfect, he has a 4.600 bore.

Re: Head gaskets--Fel-Pro or Cometic
 

Ok guys now that I'm past my panic attack Ijust got off the phone with the Cometic tech department 1-800-752-9820 I did get the right ones. Merlin III blocks with Merlin heads uses #C5331 / H1175 gaskets & no right or left . If this is wrong please tell me! I just put one back in & the other is on the stand. I put the heads back on last night!!!!!!!

Re: Head gaskets--Fel-Pro or Cometic
 

I have used the felpro MLS gaskets . There part # is 1075 for big block large bore . 4.570 . Tom

Re: Head gaskets--Fel-Pro or Cometic
 

What bore size gasket should I use on a 4.53 bore?

Re: Head gaskets--Fel-Pro or Cometic
 

GPM: Thanks very much for this info.

Re: Head gaskets--Fel-Pro or Cometic
 

4.540 or larger

Re: Head gaskets--Fel-Pro or Cometic
 

I have heard that the Cometic gaskets are re-usable----anyone know if that is true or not or just a rumor/tale?

Re: Head gaskets--Fel-Pro or Cometic
 

Maybe one of your bearings are in upside down?? Or did you forget to torque a rod bolt? I'm sure you may need to check these items

Re: Head gaskets--Fel-Pro or Cometic
 

Easy greasy my **** breaks I'm riden' with you!

Re: Head gaskets--Fel-Pro or Cometic
 

How about, Cometic or, O-Ringed Block and Copper Gasket?

Re: Head gaskets--Fel-Pro or Cometic
 

Do these gaskets have the steam holes in the back their talking about?

Re: Head gaskets--Fel-Pro or Cometic
 

I have you disassembling this by today.

Re: Head gaskets--Fel-Pro or Cometic
 

Fel pro makes 2 of the BBC metal head gaskets . the 1075 and I use the 1075-1 its for the thicker :mad: with a volume of 14.6. Ck out my thread on the Hustler build up there are some picks of them there . I have no experience with the cometic . I have heard good things .If I did not get the Fel Pro stuff for free I might? of tried the cometic's.

As far as the loc wire gaskets . Nobody really uses or needs to use them anymore just ask Fel pro teck .!800-325-8886.The MLS has been in there line for awhile and they said Nascar has been using them over the lock wire .They even sent me a set to try in the late 80's and I never did.

My connection with Fel Pro is when they came out with the Loc Wire I was doing some R&D with them on some NOS motors. I would run them and send them back for them to look at . They where tuff I never blew one, but hurt alot of parts though :D FelPro says the MLS is stronger than there lock wire gaskets.

Ck out the directions on the box ,They don't even want finger prints on the gasket surface . There is a sticky coating that attracts everything. :eek: They want a ra of 40-50. thats smooth :D

For the gen 6 stuff
They offer a top end kit 17207 comes with a 17048 head gasket for a bore up to 4.550.

The bottom end kit is a 17146 and come with the good one piece oil pan gasket.



The MLS 1075 is a .041 thick with a 4.580 bore
the 1075-1 is a .053 thick with a 4.580 bore

The new small block chevy stuff is a
1142 .041 thick with a 4.100 bore
1143 .041 thick with a 4.165 bore
1144 .041 thick with a 4.200 bore

Hope this helps
Rob :drink:

Re: Head gaskets--Fel-Pro or Cometic
 

I've been using the 17048s for five years now on SC 502s running about 5# of boost. Never had a problem. If something works for you, don't mess with it!

Re: Head gaskets--Fel-Pro or Cometic
 

Yes I reused one head last year only had approx 20
hours on it prior.

I called Cometic and got there approval first.
Blown 10 lbs boost. Going Strong!

Gerry

Re: Head gaskets--Fel-Pro or Cometic
 

Hey Cole-one just use more of the RTV silicone, works great!!! :evilb: :evilb: :evilb:

Re: Head gaskets--Fel-Pro or Cometic
 

i have reused mine on a blower motor ran one year pulled them down cleaned them and put them back on the next year no problems so far i was told by a promod engine builder they reuse them as long as the black is still on them i dont think i will do it a third time though that may be pushing it

Re: Head gaskets--Fel-Pro or Cometic
 

That style gasket has been around for many years and I believe it came from overseas on high performance motors weather it be bikes or cars.
I think the biggest issue on reusing it is to make sure none of the coating is coming off, If it is you will see shiny spots on the dark colored surface. This usually happens between the cyl on the thinnest part. If you see this don't reuse them. These gaskets are put on dry and the surface needs to be flat and have a smooth RA number like Strip said.

Re: Head gaskets--Fel-Pro or Cometic
 

Cometic will tell you they are re-usuable. They have a minimum thickness dimension, when they are not compressed. They will have you measure the gasket thickness between cylinders and if it is more than "x" they claim you should be ok. The minimums vary with gaskets I believe. I was going to try it and decided to anti up for new ones. Just too darn much work pulling things back apart! Give them a call.

Re: Head gaskets--Fel-Pro or Cometic
 

I agree with you Bob. There is no way I'm going to take a chance at reusing the gaskets to save a few $$.

Re: Head gaskets--Fel-Pro or Cometic
 

been running my for over a year after using them for the second time no leaks exclent leak down #s and no water in the oil and this is on a 540 with 7 lbs. boost 8.6 comp. timing at 30 no problems

Re: Head gaskets--Fel-Pro or Cometic
 

Just pulled down my 540 blower motor a few weeks ago,felpro's still looked new after 2 years,130 hours as much as 12lbs boost but normally 9lbs,Smitty
I wish the Cloyes hex adjust true rollertiming chain,j/e blower pistons and comp magnum hyd roller lifter's still looked as good :( (they are all either marginal or junk!

Re: Head gaskets--Fel-Pro or Cometic
 

Heres some more info I found

502 hp 500 head gasket 17048 is the same as the 1045 with a bore of 4.550

The 17049 if for a 4.630
Both of theses are for a gen 5 and 6

The intake gasket on a 502 carbed gen 5 -17341 is the same as a 1274 that has the upper bolt holes.

The 17342 intake gasket is for the efi gen 5 and 6 it the same as a 1275 with out the bolt holes


The top end rebuilt kit [head set] is
17249 gen 5 that comes with a 1274 intake that will not work on a 500hp carbed because of the dart intake .

the 17281 is a gen 5 efi set

the 17207 in the gen 6 set like on my 500 efi .

Hope this helps?

Rob

Re: Head gaskets--Fel-Pro or Cometic
 

rob, this is an older thread but what about.......

a gen6 502, "088" cyl heads and a dart intake? what gaskets then?

i ask this because im getting water in the oil...bad! i used the 1047 head gaskets and im not sure on the intake gasket, but you mention that the dart intake is different in the fel pro pkge, why is that?

thanks
kevin

Re: Head gaskets--Fel-Pro or Cometic
 

Ttt

Re: Head gaskets--Fel-Pro or Cometic
 

Kevin I would call FelPro to make sure 800-325-8886 .This is what they list for 5 and 6 motors [17048 is the same as the 1045]




The dart intake does not have the upper 4 bolt holes. You would have to use a gasket for the dart or a aftermarket intake .I belive they have the heat crossover blocked off also. [for the choke] The 1275 intake gasket with out the bolt holes.


head gasket how to
http://www.federal-mogul.com/cda/sea...1,2283,00.html

If ya want to call me PM me your #

Rob :D

Re: Head gaskets--Fel-Pro or Cometic
 

I use the felpro 17048's Had a problem on friend's 572's
that we got used. They came with cheap silver gaskets, I believe graphite. They may have been Victor. The problem was that the fire ring around the cylinder would crack and eventually burn through. One of the heads was ported by a complete retard. This was noticed upon rebuild and we were advised to use Cometic. Cometic offers more bore sizes than Felpro, And had a gasket even bigger than the 17049 to seal the combustion chamber that was opened up too much. Felpro makes great gaskets. I use them all the time. I never have seen a head gasket failure on a V-8 with felpro gaskets.
I have seen several stock GM gaskets that let go . It seems that the Felpro gaskets can withstand a severe overheating. One more thing, With a blower motor it would be advisable to use the Dart heads. They have at least twice the deck thickness and provide a much better clamp to hold a gasket. Also eliminates crossover problems. I've had intake gaskets burn out in the crossover area. MY 2 CENTS BBB

Re: Head gaskets--Fel-Pro or Cometic
 

what about copper gaskets?

Re: Head gaskets--Fel-Pro or Cometic
 

I wouldn't use them in a marine engine

Re: Head gaskets--Fel-Pro or Cometic
 

548 with 7 lbs on Cometics for two years with no issues.
Another nice thing with the Cometics that hasn't been mentioned is the availability of thinner gaskets down to .027 in the standard sizes. This is nice to pick up a little compression and improve qwench assuming you haven't already decked the block.
Dave

Re: Head gaskets--Fel-Pro or Cometic
 

Running cometics on my 12.7:1 comp ratio 383.. no problems at all :D I would recommend them to anyone.

Re: Head gaskets--Fel-Pro or Cometic
 

My race engine builder friend 'required' me to use the same brand and style of gasket that he used with torque plates when he bored and honed the cylinders. It seems extreme but thats how he got his reputation. He says that a different gasket might affect clamping load and distort the cylinder.

Re: Head gaskets--Fel-Pro or Cometic
 

I wouldn't run then in anything if I didn't have too, they are for way high comp motors or big boost like a 14-71 running upwards of 15 pounds. They do not seal woth a sh!t at the water passages and are just nightmares in general, if you don't need then due to cylinder pressure stay away from them.