GM Iron Phase info needed

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cuisinartvette
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GM Iron Phase info needed

Post by cuisinartvette » Tue Oct 10, 2017 8:11 pm

Hello
I picked up what I believe are a set of Phase 2s.
Can anyone point me to any specs...cc chamber runner size any type of flow #
Having them cleaned and checked out so havent gotten there yet.

Cant find any info on the web on these.
Nice looking combustion chamber considering how old they are

If they arent too far gone plan on going through them picking them up some maybe throwing a shortblock underneath if its worth it.
Old school solid flat cam type deal.

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Re: GM Iron Phase info needed

Post by Carnut1 » Tue Oct 10, 2017 9:12 pm

Off memory, 185cc intake ports, 64 cc chambers. Induction hardened exhaust seats, 2.02" / 1.6"valve seats. Dated design but work up really nice. Expect to do some work to really get some power out of them. Thanks, Charlie
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Re: GM Iron Phase info needed

Post by Carnut1 » Tue Oct 10, 2017 9:40 pm

Stock flow numbers 220/155 or so
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Re: GM Iron Phase info needed

Post by cuisinartvette » Tue Oct 10, 2017 10:25 pm

Thanks carnut, had a hard time saying no to these
Should be a fun project to see what can be had out of these within reason.

Got some work to do, not bad # for the time but weaksauce today.
Any weak spots?

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Re: GM Iron Phase info needed

Post by Carnut1 » Wed Oct 11, 2017 5:54 am

I have only ported two sets. Still have them. I have never had them on the bench stock. With early 90's porting 2.055"/ 1.6" valves a guess of 200 +cc intake flow was 282 / 200. I have posted pics of them before but doubt I have those pics now. Heads are in storage. I have seen them crack from racing but they are much thicker and durable than stock. I would say if they have a weakness it is water around the exhaust. The stock bowtie exhaust is small and with some work pulls good air. It doesn't need to be huge unless the rpm or cubes are very high.Thanks, Charlie
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Re: GM Iron Phase info needed

Post by cuisinartvette » Wed Oct 11, 2017 2:21 pm

Half tempted once they are done to throw together a shortblock under it..something old school GMish appearing

Older grind Solid flat tappet (yes) plenty of compression just a basic have fun with motor;somthing kinda ratty and not effficient :mrgreen:
Have a new machinist that "sounds" like they are working with me on price we shall see. My old guy retired and most the "name" shops all send thier stuff out to them anyway; all I hear are upsale pitches, it gets old...then they keep the parts for 2 months
Suggestions on CR and cam appreciated.

Gonna keep the 2.02 intakes dont want to pour too much into them, doing all guides wether they need it or not just due to age
If I saw 240-260 int and around 200+-Id be happy

Something somebody could paint orange and pull off a stock like appearance despite headers.

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Re: GM Iron Phase info needed

Post by rfoll » Wed Oct 11, 2017 8:51 pm

Phase II Bowties start out at 64 cc chamber, the earlier ones were 67ccs. There is plenty of iron to work with when you port them, I have seen published 202 intake flows of around 270.
So much to do, so little time...

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Re: GM Iron Phase info needed

Post by Carnut1 » Wed Oct 11, 2017 9:47 pm

IMG_20130416_195348_648_2.jpg
90's ported bowties 2.055"/1.6"
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Re: GM Iron Phase info needed

Post by rustbucket79 » Wed Oct 11, 2017 11:22 pm

Owned and ported a set of phase 2's, flowed one chamber and got 262 int, 223 exh. Propelled a 3400 pound Camaro to mid 10's on a 406. Many, many porting hours, obviously in the wrong places on the intake ports. :lol:
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Re: GM Iron Phase info needed

Post by cuisinartvette » Fri Oct 13, 2017 4:10 pm

As luck would have it guides are worn which I figured, new machinist said seats have been replaced before

Knew the exh valves were sunk some but now saying they arent any good period. Into the trash pile they go....damn.

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Re: GM Iron Phase info needed

Post by Carnut1 » Fri Oct 13, 2017 6:14 pm

Really? Damn, they must be really bad.
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Re: GM Iron Phase info needed

Post by Carnut1 » Fri Oct 13, 2017 6:15 pm

Snap some pics for us before you trash them.
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Re: GM Iron Phase info needed

Post by cuisinartvette » Fri Oct 13, 2017 8:31 pm

Will do soon as I get them back, want to see you guys' opinion
If they are trash then so be it.

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