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Old 09-03-2013, 05:32 PM
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Help with another 355 build!

My friend gave me the engine out of his wrecked 97 Z28. I am going to put this engine in my 47 Olds. Ive got the short block back from the machine shop, cleaned, bored .30 over stock pistons and balanced. I would like some suggestions about heads and cam. I would like to get near 400 HP from the engine using fuel injection. I have an 8.8 ford rear with 353 gears. I will be installing the rebuilt 4L60 trans from the 97 Z28 also. Looking at a driver with reliability in mind.
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Old 09-03-2013, 05:43 PM
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When you say "stock pistons",what type of pistons are you talking about?Do you currently have an EFI system,or,are you gonna purchase 1 ?
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Old 09-03-2013, 10:00 PM
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220 roller hydraulic,shp heads or equal.1 5/8 headers,free flow 2 1/2 inch or bigger exhaust,9.8:1 cr,,,for starters
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Old 09-04-2013, 04:06 AM
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If you don't know the part# for the pistons used,I would ck to see how far down inthe cylinder the pistons are.Hopefully they are not the "rebuilders pistons" w/ a short 1.54" pin hgt.Also,are you using the PCM & engine/trans mgmt from the 97?If using aftermarket EFI system,most controllers that come with them won't control the 4L60E.The 0411 controller from a 99 up would be the better option.Better tuning options & capability & you can control engine & trans w/ 1 controller.
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Old 09-04-2013, 04:10 AM
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Originally Posted by vinniekq2 View Post
220 roller hydraulic,shp heads or equal.1 5/8 headers,free flow 2 1/2 inch or bigger exhaust,9.8:1 cr,,,for starters
Since I already have the pistons, can I change the CR? What size heads would be best? Can you pls explain more about the cam? Sorry if dumb questions, first build.


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When you say "stock pistons",what type of pistons are you talking about?Do you currently have an EFI system,or,are you gonna purchase 1 ?
Flat top pistons. I would like to use the stock EFI system if I can.
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Old 09-04-2013, 04:21 AM
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Use 1 of the online DCR calculators to play around with different head chamber sizes & cams to see what your CR would be with different combos.For instance,with flat tops & a 64cc head,you are gonna be in the neighborhood of 10:1 SCR which would be borderline w/ iron heads,but,fine w/ aluminum.Cam choice will also play a role in your final effective CR (DCR) as well. Comp cams XR264HR would be a good choice for good streetable cam depending on what you HP goals are.IIRC,the stock EFI can support approx 400 HP.
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Old 09-04-2013, 06:27 AM
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The type pistons used are not the only determining factor in your final CR.Chamber volume,headgasket thickness/bore, piston to deck hgt. all play a role in your final CR.It's important to know how far your pistons are down the cylinder to determine the parts used to complete the build.If pistons with a shorter pin hgt were used,(1.540" vs 1.560"),your pistons could already be up to .045" plus the thickness of the head gasket used.Optimum quench,(the distance between head deck & piston top is .039 to .045.If your pistons are already .045 down w/o the gasket,you will want to keep CR relatively mild to avoid detonation.Proper quench helps to deter detonation & provides a more complete & efficient burn.
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Old 09-04-2013, 06:38 AM
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If this is a 19971 350 LT1 Gen II motor you can only use a GENII style head on it.
LT1 or Lt4 motor. Where are the stock heads for this motor? Stock EFI intake manifold etc?
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Old 09-04-2013, 11:19 AM
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The type pistons used are not the only determining factor in your final CR.
Thanks for your replies!
Assuming I can get ahold of the shop, and they actually know what I'm talking about, is there another way of determining where the piston is in the bore?
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Old 09-04-2013, 11:24 AM
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If this is a 19971 350 LT1 Gen II motor you can only use a GENII style head on it.
LT1 or Lt4 motor. Where are the stock heads for this motor? Stock EFI intake manifold etc?
Yes, I got the entire engine (with accessories still on it) , trans, wiring harness and computer. It was an LT1 aluminum heads, gear driven water pump etc. I believe the heads are small valve and would need to be reworked to be of any rear use. I think that the benefits of a new set would outweigh what I would get by having my old heads redone. RIGHT?????
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Old 09-04-2013, 11:51 AM
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You can measure the depth of your pistons with a depth mic,or,in a pinch,you can use a straight edge across the cylinder top & use feeler guages to get a somewhat close idea of the the deck hgt.You will wanna measure @ least on all 4 corners with that piston @ TDC.If the block hasn't been decked,the pistons should be .025" to .030 deep.If they are any deeper,the shop used "rebuilders pistons" with the shorter pin hgt.If so,changing pistons,or,decking the block would be your only way to correct it.If neither of those is an option for you,use a .015" shim gasket to get quench as tite as possible with what you have.This will give you approx .060" quench.The stock heads are not bad heads with some work.F'bird can give you best course of action what needs to be done with them,or,recommend a more suitable head for your goals.
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Old 09-04-2013, 12:15 PM
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Your engine stock,should have had approx 10.5:1 compression.Your aluminum LT1 heads have 54cc chambers & flow around 212 cfm as is with 1.94" & 1.5" valves.Some porting & cleanup.Maybe up the valve sizes to 2.02 & 1.6. They would probably easily support your HP goals.If the pistons turn out to be the shorter version,your CR will be slightly lower.The overbore will also give you a slight increase in CR.The stock injectors are rated @ 23 to 24 lb/hr.I can see you making 400 HP relatively easy & still maintaining good drivability.Getting a good PCM tune would also benefit you a lot.
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Old 09-04-2013, 01:13 PM
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I don;t know It depends on how much power you want to make. I don;t pay other people to port "re work" cylinder heads. I do it my self. Whether its best for you to port your LT1 heads or get and port a set of the LT4 heads or go aftermarket depends on what you are after and what you are willing to do.
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Old 09-04-2013, 03:20 PM
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Quote:
Originally Posted by jokerZ71 View Post
Your engine stock,should have had approx 10.5:1 compression.Your aluminum LT1 heads have 54cc chambers & flow around 212 cfm as is with 1.94" & 1.5" valves.Some porting & cleanup.Maybe up the valve sizes to 2.02 & 1.6. They would probably easily support your HP goals.If the pistons turn out to be the shorter version,your CR will be slightly lower.The overbore will also give you a slight increase in CR.The stock injectors are rated @ 23 to 24 lb/hr.I can see you making 400 HP relatively easy & still maintaining good drivability.Getting a good PCM tune would also benefit you a lot.
Well, without having a depth gauge, and using a stright edge and feeler gauge, it appears they are re-builder pistons. So, I'm not able to do any work on my current heads and I would feel better purchasing a good set of heads along with a cam to match to get the 400HP I'm looking for. I believe it would money well spent.

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I don;t know It depends on how much power you want to make. I don;t pay other people to port "re work" cylinder heads. I do it my self. Whether its best for you to port your LT1 heads or get and port a set of the LT4 heads or go aftermarket depends on what you are after and what you are willing to do.
F-Bird, see above.
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Old 09-04-2013, 03:37 PM
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Vortecs flow approx 234 or so outta the box & are advertised to support 400HP as is,so'with your heads flowing 212,they will need some work.You do have slightly larger ports,so,IDK how much work we're talkin about.That being said,a set of aftermarket heads would definitely be a good investment,or,having someone rework yours.Get pricing for both & weigh the results.Keep in mind,that you having more flow & velocity is always a good thing.You may decide later to up your power requirements. If I had to guess & assuming you will have all the work hired out,I'd say you could buy a good set of heads for not much more than you'll have invested in yours.I would think that gaining another 22 cfm or so would take some substantial work.Not to mention new guides,seats,valves,springs,& machine work.You could probably sell yours to somebody.They're not bad heads.They just ain't gonna support 400 HP as is.

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