Replacement SBC heads...????
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Replacement SBC heads...????
Now that I have found the problem with my '81 engine (bent valves, possibly guides are shot as well)..I was thinking...instead of getting these heads fixed, what would be a nice replacement head? This is on a 2 bolt main, stock block, bored 0.030, flatop 2 valve relief floating pistons, stock intake and q-jet with the CCC still connected.
Present heads are GM 882's with 2.02/1.6 valves, valve guides, screw-in studs.
Suggestions????
LannyL81
Present heads are GM 882's with 2.02/1.6 valves, valve guides, screw-in studs.
Suggestions????
LannyL81
NCM Grand Opening Veteran
Joined: Sep 2005
Posts: 20,979
Likes: 384
From: South of giving a damn
St. Jude Donor '11, '17
We'll need some more info. What's your current CR? How much can you afford to spend? Things like that. You need to remember that heads are just part of the total package. Dart & World both make reasonable iron heads that might work. GMPP offers fastburn vortec heads, which are good, but you would need to change intakes.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Originally Posted by LannyL81
Now that I have found the problem with my '81 engine (bent valves, possibly guides are shot as well)..I was thinking...instead of getting these heads fixed, what would be a nice replacement head? This is on a 2 bolt main, stock block, bored 0.030, flatop 2 valve relief floating pistons, stock intake and q-jet with the CCC still connected.
Present heads are GM 882's with 2.02/1.6 valves, valve guides, screw-in studs.
Suggestions????
LannyL81
Present heads are GM 882's with 2.02/1.6 valves, valve guides, screw-in studs.
Suggestions????
LannyL81
here's a 16pc set of 2.02/1.6 stainless for $80
http://www.competitionproducts.com/p...sp?number=8440
here's a set of same valves with retainers, dropin Z28 springs, locks & seals for $130.
http://www.competitionproducts.com/p...?number=851226
Last edited by jackson; Nov 26, 2006 at 10:01 AM.
Race Director
Joined: May 2005
Posts: 10,674
Likes: 122
From: Millington Illinois
St. Jude Donor '08-'09
a set of AFR 195 heads and a Hydraulic retro roller will wake that thing up. Will cost you about $2500 to do it complete but you will gain lots of power and still be a nice street engine. Post your trans and rear gear for cam recomendations.
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Engine was decked to a -0.006 (lousy machine shop...), current heads were shaved down to about 74cc, pistons are H631CP30's. I calculated the static CR to be about 9.8:1...if I remember correctly.
Current cam is a Comp Cams 268H grind along with 1.6 ratio roller tipped rockers.
Rear end is the stock 2.78 and this is a 4sp (super T-10) trans.
The original heads were the 624's and and of course were cracked, so I got a set of 882's with the larger valves, bronze guides, heavier springs, screw-in studs, guide plates.
Hopefully the heads are not messed up and I can just replace the intake valves that hit the pistons (my error...or rather followed wrong advice).
Was just wondering if their is a set of aftermarket heads that provide better flow for about the same as fixing the 882 heads???
Thanks
Current cam is a Comp Cams 268H grind along with 1.6 ratio roller tipped rockers.
Rear end is the stock 2.78 and this is a 4sp (super T-10) trans.
The original heads were the 624's and and of course were cracked, so I got a set of 882's with the larger valves, bronze guides, heavier springs, screw-in studs, guide plates.
Hopefully the heads are not messed up and I can just replace the intake valves that hit the pistons (my error...or rather followed wrong advice).
Was just wondering if their is a set of aftermarket heads that provide better flow for about the same as fixing the 882 heads???
Thanks
Drifting
Joined: Apr 2002
Posts: 1,716
Likes: 4
From: New Baden Illinois
There are plenty of aftermarket heads that provide better flow than the originals. There are also some aftermarket heads that are supposed to be stock replacement, but have a little better flow, such as the World Products S/R Torquer. Summit also has a set of stock style heads for only $649/pair (assembled). The only problem is that most aftermarket style heads come in 64cc or 72cc. If you are currently running 9.8:1 with 76cc or 74cc, this will raise your compression ratio too high for the street.
World Products makes the S/R Torquer in 76cc. They are $799/pair from Summit.
World Products makes the S/R Torquer in 76cc. They are $799/pair from Summit.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Originally Posted by LannyL81
Engine was decked to a -0.006 (lousy machine shop...), current heads were shaved down to about 74cc, pistons are H631CP30's. I calculated the static CR to be about 9.8:1...if I remember correctly.
And ... What gasket was on there?
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Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Originally Posted by jackson
Are your pistons down in hole six thousandth's? ... OR ... are they above deck six thousandth's?
Above the deck by 0.006...not exactly zero-decked.
And ... What gasket was on there?
Above the deck by 0.006...not exactly zero-decked.
And ... What gasket was on there?
Melting Slicks
Joined: Mar 2006
Posts: 2,465
Likes: 0
From: Orange Park Fl
Lanny, I have an '81 with flat top hyperteuetics, headers and duals, and CCC system in place. I did a lot of planning for the engine before I rebuilt it and went with the comp XE 262 and a set of Dart Iron Eagle 180cc runner, 72 cc chamber heads. I got them from a dealer on e-bay for under $800 delivered assembled ready to bolt on. Did a little mild port/ polish work with a dremmel tool and the car is great; fast and fuel efficient. God bless, Sensei
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Originally Posted by a1sensei
Lanny, I have an '81 with flat top hyperteuetics, headers and duals, and CCC system in place. I did a lot of planning for the engine before I rebuilt it and went with the comp XE 262 and a set of Dart Iron Eagle 180cc runner, 72 cc chamber heads. I got them from a dealer on e-bay for under $800 delivered assembled ready to bolt on. Did a little mild port/ polish work with a dremmel tool and the car is great; fast and fuel efficient. God bless, Sensei
Sensei,
Did you have the block zero-decked? Sure wich I could go with headers and duals....but have to pass emissions here...at least one more time next month....after that may be not.
I will check into what my Compression Ratio would be with 72cc heads...may be these will work for me as well. I almost went with the XE262 cam...but decided on the 268H instead.
Thanks for the info. Going to check out the World Heads and the Dart Iron Eagles as well...compare the price against getting my 882's fixed.
LannyL81
Abby Normal
Joined: Dec 2001
Posts: 53,452
Likes: 92
From: Press "2" for English
if your interested, i have a set of 441 heads that i was planning on using for my motor. they were punched out to 2.02/1.60 with 120# single springs. they had fresh guides, screw in studs and a 3 angle on them when i bought them. i bought them off a guy i know (pretty well) who ran them for 3-4k miles and then pulled his whole motor down to build a blown stroker motor.
since i got them, i did some mild, well not really, porting work myself (i posted a thread about two months ago with some before and after pics. if you're interested you could search for it). these are already big 76cc chamber heads so if you're happy with the way your 882s were set up, then these would be pretty comparable.
i don't think i could let them go for less than $300, but that's not significantly more than what machine work would cost you anyway.
looking for any excuse to go with some aluminum heads. let me know.
since i got them, i did some mild, well not really, porting work myself (i posted a thread about two months ago with some before and after pics. if you're interested you could search for it). these are already big 76cc chamber heads so if you're happy with the way your 882s were set up, then these would be pretty comparable.
i don't think i could let them go for less than $300, but that's not significantly more than what machine work would cost you anyway.
looking for any excuse to go with some aluminum heads. let me know.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Originally Posted by LannyL81
I will check into what my Compression Ratio would be with 72cc heads...may be these will work for me as well.LannyL81
You're not gonna learn much useful info about your past or future CR if you don't know how far pistons below-above deck or zero-decked?
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Originally Posted by jackson
6 or what? above or below?
You're not gonna learn much useful info about your past or future CR if you don't know how far pistons below-above deck or zero-decked?
You're not gonna learn much useful info about your past or future CR if you don't know how far pistons below-above deck or zero-decked?
The pistons are above the deck by 0.006 at TDC.
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Originally Posted by clutchdust
if your interested, i have a set of 441 heads that i was planning on using for my motor. they were punched out to 2.02/1.60 with 120# single springs. they had fresh guides, screw in studs and a 3 angle on them when i bought them. i bought them off a guy i know (pretty well) who ran them for 3-4k miles and then pulled his whole motor down to build a blown stroker motor.
since i got them, i did some mild, well not really, porting work myself (i posted a thread about two months ago with some before and after pics. if you're interested you could search for it). these are already big 76cc chamber heads so if you're happy with the way your 882s were set up, then these would be pretty comparable.
i don't think i could let them go for less than $300, but that's not significantly more than what machine work would cost you anyway.
looking for any excuse to go with some aluminum heads. let me know.
since i got them, i did some mild, well not really, porting work myself (i posted a thread about two months ago with some before and after pics. if you're interested you could search for it). these are already big 76cc chamber heads so if you're happy with the way your 882s were set up, then these would be pretty comparable.
i don't think i could let them go for less than $300, but that's not significantly more than what machine work would cost you anyway.
looking for any excuse to go with some aluminum heads. let me know.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
LannyL81:
355" ... H631+.030 (-5cc dv) @ 0.006" above deck, 74cc chambers with an inexpensive Victor Reinz P/N 1178SGB composition gasket (0.045" x 9.8cc) will make right at 9.3:1 SCR @ good 0.039" quench.
handy accurate scr calculator at Federal Mogul site:
http://www.21cgt.com/FMWebCatalog/frmConversion4.aspx
FYI for above scr calc ... minus sign deck clearance when piston above deck ... minus sign dome volume when piston dished or flattop w/ valve relief(s).
355" ... H631+.030 (-5cc dv) @ 0.006" above deck, 74cc chambers with an inexpensive Victor Reinz P/N 1178SGB composition gasket (0.045" x 9.8cc) will make right at 9.3:1 SCR @ good 0.039" quench.
handy accurate scr calculator at Federal Mogul site:
http://www.21cgt.com/FMWebCatalog/frmConversion4.aspx
FYI for above scr calc ... minus sign deck clearance when piston above deck ... minus sign dome volume when piston dished or flattop w/ valve relief(s).
Thread Starter
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Originally Posted by jackson
LannyL81:
355" ... H631+.030 (-5cc dv) @ 0.006" above deck, 74cc chambers with an inexpensive Victor Reinz P/N 1178SGB composition gasket (0.045" x 9.8cc) will make right at 9.3:1 SCR @ good 0.039" quench.
handy accurate scr calculator at Federal Mogul site:
http://www.21cgt.com/FMWebCatalog/frmConversion4.aspx
FYI for above scr calc ... minus sign deck clearance when piston above deck ... minus sign dome volume when piston dished or flattop w/ valve relief(s).
355" ... H631+.030 (-5cc dv) @ 0.006" above deck, 74cc chambers with an inexpensive Victor Reinz P/N 1178SGB composition gasket (0.045" x 9.8cc) will make right at 9.3:1 SCR @ good 0.039" quench.
handy accurate scr calculator at Federal Mogul site:
http://www.21cgt.com/FMWebCatalog/frmConversion4.aspx
FYI for above scr calc ... minus sign deck clearance when piston above deck ... minus sign dome volume when piston dished or flattop w/ valve relief(s).
I used the FelPro head gasket and thought that the thickness was more like 0.020...but will check when I get another set next week.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
Originally Posted by LannyL81
I used the FelPro head gasket and thought that the thickness was more like 0.020...but will check when I get another set next week.
