Which Heads to put on?
02-22-2007, 09:19 AM
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Car: 86 Iroc Z28
Engine: 350 5.7L (rebuilding now)
Transmission: 700R4 shift kit
Axle/Gears: 3.73, 9-Bolt, stock posi
Which Heads to put on?
Well the passenger head was cracked and also had a blown headgasket. I have no more than $1000 to spend on a set of heads. I don't want to change anything but have a decent performance head for that amount of money. Originally had the 882 castings on it. What would you all recommend given what we have:
87 350 (non-roller, I believe it's a truck motor, but haven't checked yet)
bored 40 over
flat top pistons
Cam, is a comp. cams, but not sure which one. Supposed to be just slightly better than stock.
TPI with 30lb injectors
700R4 tranny with shift kit
3.73 posi rear
aluminum drive shaft
MSD 6A
Will be putting Hooker 2055 headers on as well.
I don't want to change the intake manifold or reprogram, etc. It's a daily driver and had decent performance before, but would like to add a little more pep to it.
I'm open for any and all suggestions, but I really don't know which heads/castings to put on.
Thanks,
Pat
87 350 (non-roller, I believe it's a truck motor, but haven't checked yet)
bored 40 over
flat top pistons
Cam, is a comp. cams, but not sure which one. Supposed to be just slightly better than stock.
TPI with 30lb injectors
700R4 tranny with shift kit
3.73 posi rear
aluminum drive shaft
MSD 6A
Will be putting Hooker 2055 headers on as well.
I don't want to change the intake manifold or reprogram, etc. It's a daily driver and had decent performance before, but would like to add a little more pep to it.
I'm open for any and all suggestions, but I really don't know which heads/castings to put on.
Thanks,
Pat
02-22-2007, 09:39 AM
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Car: 1986 Iroc Z 28
Engine: 383
Transmission: 4L60
Axle/Gears: 3.73
Trick Flow 23 degree aluminum heads from Summit part number #
TFS-30300001. $ 995.95
175 cc intake runners and 56cc chambers so should give you a little boost in compression and still be totally streetable. Great heads for the money!
www.summitracing.com
TFS-30300001. $ 995.95
175 cc intake runners and 56cc chambers so should give you a little boost in compression and still be totally streetable. Great heads for the money!
www.summitracing.com
02-22-2007, 10:34 AM
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Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Or go with the 195cc bare for 800 bucks. You could put your own valves and springs in it for 200. They will be streetable and give room for lots of improvement with other parts. They're aluminum though so get one with a chamber that will up your compression a bit.
02-22-2007, 10:58 AM
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Car: 86 Iroc Z28
Engine: 350 5.7L (rebuilding now)
Transmission: 700R4 shift kit
Axle/Gears: 3.73, 9-Bolt, stock posi
Thanks guy for the advice and suggestions. Out of curiosity, if I went with a 56cc chamber, won't that push my compression too high and possibly blow head gaskets on a regular basis? I'm bored 40 over.
Thanks,
Pat
Thanks,
Pat
02-22-2007, 11:09 AM
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Car: 91 rs
Engine: Blow through 383, 10 psi, xr288hr
Transmission: Manual th350 ATI 3000
Axle/Gears: 3.50 9"
Do you have flat top pistons, or a slight dish? Those 882s had 76cc chambers didn't they? The tfs heads are aluminum though so you can run 10:1 compression with no worries, maybe 10.5, but no you wouldnt push out a head gasket, especially with the low rpm personality of tpi. While you have the intake off, why not through a much better cam in there too?
02-22-2007, 11:34 AM
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Car: 86 Iroc Z28
Engine: 350 5.7L (rebuilding now)
Transmission: 700R4 shift kit
Axle/Gears: 3.73, 9-Bolt, stock posi
Hi, and thanks again for the quick replies! I really appreciate it.
They are flat top pistons and have the 2 little dishes in them for the valve clearance. Yes, I believe the 882's were the 76cc chambers as well.
I had thought about a different cam, especially so I would know what I had in it. :-) But I really didn't want to have to change anything in the regular setup of the car, i.e., chip reprogramming or the intake manifold and tpi setup. My son is driving this car, he's 17 soon to be 18, and although he is a pretty responsible kid, he is a teenager and we all remember those days. I would like to give him more pep and the headers will add some extra HP over the stock manifolds.
Is there a good cam you could suggest that I can put in so that I don't have to change any of the stuff I mentioned?
The engine is currently non-roller and has the flat hydraulic lifters.
Thanks again,
Pat
They are flat top pistons and have the 2 little dishes in them for the valve clearance. Yes, I believe the 882's were the 76cc chambers as well.
I had thought about a different cam, especially so I would know what I had in it. :-) But I really didn't want to have to change anything in the regular setup of the car, i.e., chip reprogramming or the intake manifold and tpi setup. My son is driving this car, he's 17 soon to be 18, and although he is a pretty responsible kid, he is a teenager and we all remember those days. I would like to give him more pep and the headers will add some extra HP over the stock manifolds.
Is there a good cam you could suggest that I can put in so that I don't have to change any of the stuff I mentioned?
The engine is currently non-roller and has the flat hydraulic lifters.
Thanks again,
Pat
02-22-2007, 12:51 PM
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Car: 1987 IROC 1991 RS
Engine: 5.7 TPI 5.0 TBI
Transmission: T-5 , 700R4
Axle/Gears: 2.73 twice
Since it is an 87 MAF system there shouldn't be much need for what your asking about the reprogramming, other than the 30lbs injectors, if you use them then you will be dumping way too much fuel than what the computer thinks its putting in. The ECM can adjust to the new setup, however it is not ideal, it will not reach its full potential without burning a PROM. If you converted to MAP, then you will definatly have to, or your gonna have more problems then you know.
Also make sure of your compression ratio, if your currently running 76cc heads, and you go down to 56cc while bored .40 over, you may have too high of a CR, even for aluminum heads. You need to do the math first to find out how many CCs the dish pistons are, bore size, whether or not the piston is still in the hole and how much, ect. Just me removing 64cc heads and going to 58cc heads bumped me to 10.5 to 1 compression ratio, aluminum heads yes, but not overdoing it either.
Also make sure of your compression ratio, if your currently running 76cc heads, and you go down to 56cc while bored .40 over, you may have too high of a CR, even for aluminum heads. You need to do the math first to find out how many CCs the dish pistons are, bore size, whether or not the piston is still in the hole and how much, ect. Just me removing 64cc heads and going to 58cc heads bumped me to 10.5 to 1 compression ratio, aluminum heads yes, but not overdoing it either.
Last edited by ResurrectingZ; 02-22-2007 at 12:56 PM. Reason: Automerged doublepost
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02-22-2007, 01:47 PM
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Car: 86 Iroc Z28
Engine: 350 5.7L (rebuilding now)
Transmission: 700R4 shift kit
Axle/Gears: 3.73, 9-Bolt, stock posi
Thanks for all the great advice guys. I really appreciate it! It looks like I have a little bit of homework to do, but I now have a great place to start.
Thanks again, I really appreciate it!
Pat
Thanks again, I really appreciate it!
Pat
02-22-2007, 09:25 PM
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Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
The 56cc chambers will force you into 93 octane fuel. 64cc chambers would be better, but still require high octane fuel.
Also, it appears that the engine ran OK with the 30#/hr injectors. Are you absolutely sure the injectors are 30s? You might consider installing 24#/hr injectors.
Being 40 over gets you about 7 to 8 more cubes of displacement, not a big hitter on the compression ratio. The effect is a ratio of 7 parts in 350 parts, or about 2% effect. That will take a 9.5 CR to 9.69 CR.
Also, it appears that the engine ran OK with the 30#/hr injectors. Are you absolutely sure the injectors are 30s? You might consider installing 24#/hr injectors.
Being 40 over gets you about 7 to 8 more cubes of displacement, not a big hitter on the compression ratio. The effect is a ratio of 7 parts in 350 parts, or about 2% effect. That will take a 9.5 CR to 9.69 CR.
02-23-2007, 05:25 PM
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Car: 86 Iroc Z28
Engine: 350 5.7L (rebuilding now)
Transmission: 700R4 shift kit
Axle/Gears: 3.73, 9-Bolt, stock posi
First, I want to say thanks to all who have replied. I learn so much from reading through this site and of course all who respond. I wish I could contribute back, but I am just the typical "garage mechanic"!
Ok, I have done a little investigating. I bought this car from my buddy in Houston and he had the 350 put in the car. Unfortunately, he doesn't remember the cam he put in and the sticker on the side of the engine isn't legible. It does have the 30lb injectors and he had a different chip programmed and put in.
The casting number on the block is 14093638, which according to mortek is for an 87 to 95, 2 or 4 bolt, 1 piece rear main, and roller or flat tappet cam.
The date code is I 21 7, so from what I can gather, it is an 87 350. My buddy verified it was bored 40 over as well.
I found these heads on ebay, what do you all think of these? They are cast iron, so your opinions and knowledge are greatly appreciated!
http://cgi.ebay.com/ebaymotors/ws/eB...4550595&rd=1,1
or these
http://cgi.ebay.com/ebaymotors/ws/eB...5017692&rd=1,1
Either of these any good?
I know the summit's are tons better, but I am also trying to not give my son too much extra HP. He's aggressive enough as it is! :-)
Thanks again for any suggestions!
Pat
Ok, I have done a little investigating. I bought this car from my buddy in Houston and he had the 350 put in the car. Unfortunately, he doesn't remember the cam he put in and the sticker on the side of the engine isn't legible. It does have the 30lb injectors and he had a different chip programmed and put in.
The casting number on the block is 14093638, which according to mortek is for an 87 to 95, 2 or 4 bolt, 1 piece rear main, and roller or flat tappet cam.
The date code is I 21 7, so from what I can gather, it is an 87 350. My buddy verified it was bored 40 over as well.
I found these heads on ebay, what do you all think of these? They are cast iron, so your opinions and knowledge are greatly appreciated!
http://cgi.ebay.com/ebaymotors/ws/eB...4550595&rd=1,1
or these
http://cgi.ebay.com/ebaymotors/ws/eB...5017692&rd=1,1
Either of these any good?
I know the summit's are tons better, but I am also trying to not give my son too much extra HP. He's aggressive enough as it is! :-)
Thanks again for any suggestions!
Pat
02-24-2007, 01:20 AM
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Car: 89 GTA Nighthawk
Engine: 389 CID Vortec TPI
Transmission: TCI 700R4 w/Vigilante
First, I want to say thanks to all who have replied. I learn so much from reading through this site and of course all who respond. I wish I could contribute back, but I am just the typical "garage mechanic"!
Ok, I have done a little investigating. I bought this car from my buddy in Houston and he had the 350 put in the car. Unfortunately, he doesn't remember the cam he put in and the sticker on the side of the engine isn't legible. It does have the 30lb injectors and he had a different chip programmed and put in.
The casting number on the block is 14093638, which according to mortek is for an 87 to 95, 2 or 4 bolt, 1 piece rear main, and roller or flat tappet cam.
The date code is I 21 7, so from what I can gather, it is an 87 350. My buddy verified it was bored 40 over as well.
I found these heads on ebay, what do you all think of these? They are cast iron, so your opinions and knowledge are greatly appreciated!
http://cgi.ebay.com/ebaymotors/ws/eB...4550595&rd=1,1
These are smog motor heads, don't waste your money!
or these
http://cgi.ebay.com/ebaymotors/ws/eB...5017692&rd=1,1
Auction ended.
Either of these any good?
I know the summit's are tons better, but I am also trying to not give my son too much extra HP. He's aggressive enough as it is! :-)
Thanks again for any suggestions!
Pat
Ok, I have done a little investigating. I bought this car from my buddy in Houston and he had the 350 put in the car. Unfortunately, he doesn't remember the cam he put in and the sticker on the side of the engine isn't legible. It does have the 30lb injectors and he had a different chip programmed and put in.
The casting number on the block is 14093638, which according to mortek is for an 87 to 95, 2 or 4 bolt, 1 piece rear main, and roller or flat tappet cam.
The date code is I 21 7, so from what I can gather, it is an 87 350. My buddy verified it was bored 40 over as well.
I found these heads on ebay, what do you all think of these? They are cast iron, so your opinions and knowledge are greatly appreciated!
http://cgi.ebay.com/ebaymotors/ws/eB...4550595&rd=1,1
These are smog motor heads, don't waste your money!
or these
http://cgi.ebay.com/ebaymotors/ws/eB...5017692&rd=1,1
Auction ended.
Either of these any good?
I know the summit's are tons better, but I am also trying to not give my son too much extra HP. He's aggressive enough as it is! :-)
Thanks again for any suggestions!
Pat
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