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01-05-2009, 05:58 PM
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#41
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Neanderthal
Join Date: Mar 2008
Posts: 5,320
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Quote:
Originally Posted by Vettezuki
My extreme upper limit for heads, fully assembled, with MLS gaskets is $1k. Link to your recommendation.
Heads are galdurned important for power, so a little extra scratch here is ok.  It increases the value and awesomeness of the car in a critical area.
FUNCTIONAL COMPATIBILITY
Should we care so much about matching this head choice to whatever FI we end up with? We're assuming the 174 can be repaired, but if it can't and we go with say a 6/8-71 Turbo (which I have a soft spot for), or if bird can make a bombass hookup with Wieand, will the same heads be equally awesome. I'm assuming yes. The cam is obviously a different story. |
Don't have a lot of time here. Going home. Heads are everything. More tomarrow. 
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64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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01-05-2009, 08:10 PM
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#42
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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Quote:
Originally Posted by BRUTAL64
Valves are too small. Need chamber size.
Alum heads are really good for forced induction. The aftermaket heads will have the latest "good" chambers and will take more boost than cast iron factory. 
With only 4 head bolts per cylinder we will need to think "O" rings or a VERY special head gasket. I have a DVD on this somewhere. |
As long as we use Fel Pro MLS gaskets we should be fine without O-rings. I'm running a set of AFR 165s on the Cobra with 9.2:1 compression and 10psi of boost and haven't had any issues with them.
As for head size that depends a lot on the specs of the cam. Joedls, do you have any idea what the specs are on that custom grind cam? We are talking about only 302ci so we don't want to go too big unless we are going to rev it really high (above 6500rpms). And if that's the case then we need to ditch the hydraulic roller and go to a solid roller. Hydraulic rollers in the 5.0 are only good to about 6500rpms. I think something around 185cc to 190cc if the cam has 220 at .050 or more. If the cam has less than 215 at .050 then something in the 165-170 range would work well.
Ben, I'd pass on that 8.8. One, it has drum brakes and two, it only has 28 spline axles. Also, I'm fairly sure that it will have to be narrowed to fit under the RX7 but you could measure and see. If you want to go with an 8.8 get one from an Explorer that already has disc brakes and 31 spline axles. |
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01-05-2009, 08:25 PM
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#43
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Senior Member
Join Date: Jul 2008
Posts: 739
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Quote:
Originally Posted by 94cobra69ss396
As long as we use Fel Pro MLS gaskets we should be fine without O-rings. I'm running a set of AFR 165s on the Cobra with 9.2:1 compression and 10psi of boost and haven't had any issues with them.
As for head size that depends a lot on the specs of the cam. Joedls, do you have any idea what the specs are on that custom grind cam? We are talking about only 302ci so we don't want to go too big unless we are going to rev it really high (above 6500rpms). And if that's the case then we need to ditch the hydraulic roller and go to a solid roller. Hydraulic rollers in the 5.0 are only good to about 6500rpms. I think something around 185cc to 190cc if the cam has 220 at .050 or more. If the cam has less than 215 at .050 then something in the 165-170 range would work well.
Ben, I'd pass on that 8.8. One, it has drum brakes and two, it only has 28 spline axles. Also, I'm fairly sure that it will have to be narrowed to fit under the RX7 but you could measure and see. If you want to go with an 8.8 get one from an Explorer that already has disc brakes and 31 spline axles.
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I agree about the MLS gaskets. I used the Cometics on my 347 with 12 PSI of boost and 9.7:1 CR, no problems.
I really can't say what the specs on the cam are. I couldn't find any info on it. I think I'd go with 185cc or 195cc with that blower. You really want to minimize any restrictions so the blower can do its job.
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HP numbers are good and all, but they are like asking someone how much they can bench. What difference does it make if I can still kick your ass?
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01-05-2009, 08:56 PM
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#44
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Member
Join Date: Nov 2008
Posts: 34
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Heads make the engine!!!! All the engine does is stay together!!!! AFR FTW!!! 185 or 205!!! 185 will do the trick, with Nitrous exhaust ports, http://www.airflowresearch.com/185sbf_strp.php
I kind of jumped a few pages.... what is the short block??? year? roller? what is done to it? Compersion?
My fox ran 11s with a stock block 9.5:1 cast pistons 351w, with a lot of blow-by, with a set of AFRs!!! 11s, it only dyno 325hp to the wheels!!!
The biggest question is how fast you guys want to go??? |
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01-05-2009, 09:17 PM
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#45
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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I agree about the AFRs, I like mine.
Canfields are also up there with AFR.
Check these out, they come with a 660 lift cam. Yeyah!
http://cgi.ebay.com/ebaymotors/sbf-c...1%7C240%3A1318
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I <3 forced induction.
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01-05-2009, 09:34 PM
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#47
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Member
Join Date: Nov 2008
Posts: 34
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01-05-2009, 10:28 PM
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#48
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by 07gtpony
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Those are pretty. Would it be good on top of our 302 for a blown application?
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01-05-2009, 10:31 PM
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#49
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Member
Join Date: Nov 2008
Posts: 34
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after Glen opens these up a bit.... yeah. anyone know the info onthe block? year? roller? what is in it? If he will take $500 yeah.
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01-05-2009, 10:38 PM
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#50
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by 07gtpony
after Glen opens these up a bit.... yeah. anyone know the info onthe block? year? roller? what is in it? If he will take $500 yeah.
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Forged 302 bored .030 over, custom grind roller cam specifically for blower, reconditioned E6 iron heads with dual springs and 1.6 roller rockers.
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