Another '68 C10 + 6.0 Swap
01-20-2009, 12:34 AM
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Another '68 C10 + 6.0 Swap So I needed a new motor for my 1968 c10. It had a 350/TH400 combo. The old motor needed rings, bearings, new cam, lifters, etc. I figured instead of spending money on the old motor that I should build the carb'd 6.0 that I have always wanted. This truck is my senior project for high school, so I am trying to keep on some kind of budget. So far the plan is:
- 2002 LQ4 out of a Denali. Has 100k when pulled
- Keep stock short block (for now)
- Swap the 317 heads for some L92's
- GMPP Carb Intake
- TH4OO
- 3500-4000 stall
- Comp Thumpr Cam
- Holley or Demon 750
Here are a few pics of my progress so far
How she sits with the Micky ET Streets out back
Pulling the old combo
And the motor I picked up from LKQ
More progress soon to come
- 2002 LQ4 out of a Denali. Has 100k when pulled
- Keep stock short block (for now)
- Swap the 317 heads for some L92's
- GMPP Carb Intake
- TH4OO
- 3500-4000 stall
- Comp Thumpr Cam
- Holley or Demon 750
Here are a few pics of my progress so far
How she sits with the Micky ET Streets out back
Pulling the old combo
And the motor I picked up from LKQ
More progress soon to come
01-20-2009, 08:06 PM
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So I traded my 317 heads and some cash for a set of L92's, but one cylinder dropped a valve. The motor was out of a 2007 Escalade with 7k on it. The whole motor was pulled under warranty. The machine shop quote to fix it is $110. While they are in the machine shop, is there anything I can have done to help increase HP? I have been told that I can mill a little off to bump up the compression, is this a good idea? And is there any porting or polishing that can be done? Oh, and do the pushrods from the 317 heads fit the L92's?
01-21-2009, 01:47 AM
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Got the valley cover off
And have some more questions.
When I use the MSD box do I reuse any of the stock harness from the coil packs?
And I have two flexplates, one from my motor and another from the 2007 caddy motor. They seem to be exactly the same, is one better?
And I have a couple coats of paint on the valve covers now, and also on the valley pan.
And have some more questions.
When I use the MSD box do I reuse any of the stock harness from the coil packs?
And I have two flexplates, one from my motor and another from the 2007 caddy motor. They seem to be exactly the same, is one better?
And I have a couple coats of paint on the valve covers now, and also on the valley pan.
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01-22-2009, 07:33 AM
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You should be able to use the pushrods, but with that valve damage a new set might be a better bet. Also might want to inspect the rockers thoroughly for damage also.
01-22-2009, 09:48 AM
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Thanks YellowZ, and th pushrods are out of my motor, which has no damage. I will check the rockers though. Anyone know how much I can have milled off my L92's to get 60cc chambers?
01-22-2009, 10:05 AM
#14
A few things.
1. You said the heads dropped a valve? Sounds like a good time to get some lighter SS valves in there, the stockers in the L92 heads are HEAVY.
2. Get some good valvesprings, with anything bigger than a stock cam I wouldn't trust the stock valve springs on those heavy valves. If you're going to stainless valves it's not AS critical, but personally I'd do it anyway.
3. I'd upgrade to a set of hardened pushrods, with the aftermarket cam. Are you an automatic? The stockers can be nice with a 6 speed if you miss a shift, as they take the abuse. With an auto it shouldn't matter.
4. Put in a new timing chain when you do it. The LS2+ timing chain is a pretty stout piece, and I believe it's part number has supplanted the LS1/LS6 style pump in the parts list from GM.
5. Ported/shimmed oil pump. If you have the motor out, I'd put a new oil pump in, just to be safe. Ported/shimmed doesn't cost much more and every little bit helps.
Beyond that, nice truck, looks great!
1. You said the heads dropped a valve? Sounds like a good time to get some lighter SS valves in there, the stockers in the L92 heads are HEAVY.
2. Get some good valvesprings, with anything bigger than a stock cam I wouldn't trust the stock valve springs on those heavy valves. If you're going to stainless valves it's not AS critical, but personally I'd do it anyway.
3. I'd upgrade to a set of hardened pushrods, with the aftermarket cam. Are you an automatic? The stockers can be nice with a 6 speed if you miss a shift, as they take the abuse. With an auto it shouldn't matter.
4. Put in a new timing chain when you do it. The LS2+ timing chain is a pretty stout piece, and I believe it's part number has supplanted the LS1/LS6 style pump in the parts list from GM.
5. Ported/shimmed oil pump. If you have the motor out, I'd put a new oil pump in, just to be safe. Ported/shimmed doesn't cost much more and every little bit helps.
Beyond that, nice truck, looks great!
01-22-2009, 08:30 PM
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Thanks for the tips digitalsolo- that is the kind of thing I am looking for. I have really wanted to stick a set of 918's in there, but I am on a budget and have to find a cheap used set first. I want to do a new oil pump and the BRP girdle for it but don't want to break open the pan, the new gaskets are spendy! I am trying to decide how far I want to go with the heads while they are in the machine shop, I don't have lots of money to throw at it.
01-25-2009, 02:01 PM
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since you have the heads at the machine shop and you want a little more power see if they can port and polish the heads. Put some better valve springs and retasiners on them and some better valves.
01-25-2009, 07:41 PM
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how much cam you gonna run? Cheap valve springs are the yellow Z06 set....a new set you can buy from Lingenfelter for around $65. If you want to run a big cam though they won't do.
A take out cam from a LS7 vette would be cheap, and the stock valve springs from that motor would be cheap too if you find takeouts. This is somewhere around 211/230 duration if I recall. You would need an extension harness and LS2 style front cover for the cam sensor.....
A take out cam from a LS7 vette would be cheap, and the stock valve springs from that motor would be cheap too if you find takeouts. This is somewhere around 211/230 duration if I recall. You would need an extension harness and LS2 style front cover for the cam sensor.....
