Head Gasket
03-28-2012, 04:28 PM
#11
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Location: Grosse Pointe Farms, MI
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Sorry for taking so long. He just got back to me today. He has been out with the flu. His price for cometic head gaskets is $70 per side, but his warehouse only stocks the 0.040 gasket. It may be more to have one ordered, but I may be able to have it sent right to your house if I place an order. Let me know if you want me to look into it more.
FWIW - did you ever just consider milling your heads down 0.030-0.050? You wouldn't hurt them at all, you could dial in your cc size, and it's not all that expensive (my machine shop charges $80 for 0.020, and they'll do the next 0.020 for less). You should be able to do some light bowl blending yourself, better protect yourself from detonation issues, and have a more dialed in motor. Just my $0.02...
FWIW - did you ever just consider milling your heads down 0.030-0.050? You wouldn't hurt them at all, you could dial in your cc size, and it's not all that expensive (my machine shop charges $80 for 0.020, and they'll do the next 0.020 for less). You should be able to do some light bowl blending yourself, better protect yourself from detonation issues, and have a more dialed in motor. Just my $0.02...
03-28-2012, 06:37 PM
#12
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The price sounds good. When it gets time to install the heads I'll let you know. As to the machining, I think I am going to have them milled a bit.. I need to CC them and see where I'm at.
Thanks for looking into this for me.
Thanks for looking into this for me.
03-29-2012, 01:47 AM
#13
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A 454Mag has a comp ratio of 8.75:1 and so do the 400, 420, 425. They are all 454's and use the same pistons, head gaskets and heads.
I would just mill the heads .020....in fact that is exactly what I did do with the 454mag I had in my 24 OL.
I would just mill the heads .020....in fact that is exactly what I did do with the 454mag I had in my 24 OL.
03-29-2012, 06:31 AM
#14
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if he mills the heads,should intake also be milled??
03-30-2012, 01:24 AM
#20
Charter Member # 55
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I did a lot of other stuff at the same time also. I did a complete top end with cam, carb, roller rockers, and Imco exhaust. The engine was very similar to Merc 420 when I was done.
I picked up 400-500rpms and about 5-6mph at WOT. Probably gained 60-70hp or so. I figured the milling was maybe good for 10hp.
I gave my specs to somebody else and he dynoed his engine at 425hp at 5000rpms. The only difference was he also changed intakes. I was spinning mine at 5400rpms.
I picked up 400-500rpms and about 5-6mph at WOT. Probably gained 60-70hp or so. I figured the milling was maybe good for 10hp.
I gave my specs to somebody else and he dynoed his engine at 425hp at 5000rpms. The only difference was he also changed intakes. I was spinning mine at 5400rpms.
Last edited by Griff; 03-30-2012 at 01:28 AM.
