Cylinder head identification (help ASAP)
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Car: 1991 firebird
Engine: TBI 305 (built)
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Cylinder head identification (help ASAP)
I found these heads locally on Craigslist for 400$ dude said they recently been checked out by machine shop and r good to go ... I'm building a lo3 305 at the moment as was leaning towards the trick flow super 23 175 heads 1200$
The casting # is 14101128 they look like later center bolt heads ? Any info on these ? I read on a forum they are 58cc chambers ? These would work well on a flat top 305 correct ?
The casting # is 14101128 they look like later center bolt heads ? Any info on these ? I read on a forum they are 58cc chambers ? These would work well on a flat top 305 correct ?
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Re: Cylinder head identification (help ASAP)
128's should be a vette casting, before they started using the 113's
Do believe they are similar with 58 cc chambers and could work on a 305. They dont flow alotbut have some potential with port work
The intake side is similar to 113 i think but exhaust side is not a d port and flows less. Could use work
Do believe they are similar with 58 cc chambers and could work on a 305. They dont flow alotbut have some potential with port work
The intake side is similar to 113 i think but exhaust side is not a d port and flows less. Could use work
Last edited by Orr89RocZ; 08-08-2013 at 08:52 AM.
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: Cylinder head identification (help ASAP)
Yea I think I'll stick with the trick flows then .. They flow good out the box and have more potential with porting & 56cc chambers ..... Anyone know what kind of compression ill have with a LO3 block with flat tops (5cc reliefs) and 56cc chamber with .015 gaskets ? Thanks
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Cylinder head identification (help ASAP)
Yea I think I'll stick with the trick flows then .. They flow good out the box and have more potential with porting & 56cc chambers ..... Anyone know what kind of compression ill have with a LO3 block with flat tops (5cc reliefs) and 56cc chamber with .015 gaskets ? Thanks
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: Cylinder head identification (help ASAP)
1.56 comp height .. Thanks fast! And ur saying 10.2 with 58cc & 10.5 with 56cc? They are also .030 over hyperneutic pistons if tat makes a difference
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Cylinder head identification (help ASAP)
I pulled up a calculator just now and assuming the piston is stock bore, sits .025" in the hole, has a 4.1" bore .015" compressed headgasket, it is right at 10.1:1 compression. .060" over makes it 10.4:1
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#8
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Re: Cylinder head identification (help ASAP)
Flattops in a 305 with 58cc heads is going to be somewhere around 9.5:1, like the original L69 HO 305s had (they used flattops and 58cc chamber heads). A little more or less depending on your exact deck height, overbore, head gasket and cylinder head chamber volume.
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Re: Cylinder head identification (help ASAP)
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: Cylinder head identification (help ASAP)
I've tried several online calculators and I'm getting between 10.2 & 10.5 on all of em ..
I may get it decked .010 to get me up around 10.7 but idk yet .. I'd like to
Stay on premium pump gas but its Really not that serious not a DD just a toy .. I figure worst case ill run a few gallons of 110 with a tank of premium for
Race nights and back timing off for premium on cruise days
I may get it decked .010 to get me up around 10.7 but idk yet .. I'd like to
Stay on premium pump gas but its Really not that serious not a DD just a toy .. I figure worst case ill run a few gallons of 110 with a tank of premium for
Race nights and back timing off for premium on cruise days
#11
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Re: Cylinder head identification (help ASAP)
Well, then you're doing something wrong. Pistons 25 in the hole+ head gasket and 58cc chambers is 9.5:1. You can start shaving it down from there by over-boring, milling down the heads and such but you're not going to come anywhere close to 10.7:1 with flattops in a 305.
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: Cylinder head identification (help ASAP)
WRONG!!! I have run multiple calculations and know this is false atleast with a .015" shim style head gasket. I have an engine with flattops and 6cc worth of dished pistons that calculated out at 9.2:1 with 64cc heads. A flattop piston 305 with 6cc valve reliefs, .015" steel shim 350 head gaskets and 58cc chambers is 9.7:1. At .030" over it is 9.85:1. Run 601 heads or mill the 58cc heads down to 52-53cc and you have a 10.5:1 engine.
Last edited by Fast355; 08-10-2013 at 08:48 PM.
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Car: 1991 firebird
Engine: TBI 305 (built)
Transmission: T5
Axle/Gears: 4.10
Re: Cylinder head identification (help ASAP)
Thanks again fast ! Also I'm doing my figuring with 56cc chambers (trick flow heads) .. I also did it with a 3.840" bore head gasket a couple times.. But Idk if ill be able to use them or not till the heads show up .. I just don't really like the idea of the gasket being 4" with a 3.766 bore ... Seems like there would be a gap or ridge ... Another ? For ya .. What is perfect "squish" .40? Between the piston and the head .. And what is the purpose of decking the block to "0" and using a thicker gasket ?
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