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#1 |
Registered User
![]() Join Date: Nov 2013
Location: Ogden, Iowa
Posts: 284
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Crate Motor Install Need help
I have purchased a 290hp 350 for my 79 K30 , i have started the swap and ran into a few things that have brought up some questions. If anyone could help itd be appreciated greatly. I'm a little new to this and still learning so i could use some guidance.
1) Can I reuse my original flywheel? the directions say to use a no weight or zero weight fly wheel because the engine is internaly balanced. How do i know if original fly wheel is? 2) It also says to plug the vaccuum advance and leave pluged? This seems strange but maybe its correct? 3) With the whole zero weight thing do i need a different harmonic balancer? Thanks, Justin |
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#2 |
Registered User
Join Date: Dec 2012
Location: Temple City
Posts: 3,586
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Re: Crate Motor Install Need help
If your K30 was a 350 then it would be neutral balance, as are all other sbc's except the 400.
I like to replace the harmonic balance as the rubber gets weak, and can slide around giving you bad timing reference. |
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#3 |
Registered User
![]() Join Date: Nov 2013
Location: Ogden, Iowa
Posts: 284
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Re: Crate Motor Install Need help
My K30 was an original 350 (what i took out), your comment leads to my next question as to where do i put the timing tool bracket on the timing chain cover?
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#4 |
Registered User
Join Date: Aug 2005
Location: Louisiana
Posts: 711
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Re: Crate Motor Install Need help
Yes, you can reuse the flexplate, I would inspect it for teeth wear and cracks. A new one is under $30.
A good point was made on the harmonic balancer, A new one would be a wise choice, can be had for under $50. Did a new timing tab come with the engine? If so, it mounts by two timing cover bolts on drivers side of engine. |
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#5 | |
Registered User
![]() Join Date: Nov 2013
Location: Ogden, Iowa
Posts: 284
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Re: Crate Motor Install Need help
Quote:
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#6 |
Registered User
Join Date: Aug 2005
Location: Louisiana
Posts: 711
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Re: Crate Motor Install Need help
It bolts where the tab will just clear the balancer you will be using. I can't tell you which holes without knowing the diameter of your balancer
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#7 |
Registered User
Join Date: Apr 2014
Location: Bloomington Indiana
Posts: 1,041
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Re: Crate Motor Install Need help
That engine will accommodate a 12:00 or 2:00 position for the timing flag, which depends on which harmonic balancer cover you get. Mine is at 2:00 using this harmonic balancer cover.
http://www.jegs.com/i/Proform/778/66518BKC/10002/-1 I used the same flexplate, but used new flexplate bolts and new torque converter bolts. Also a new torque converter, because on the K trucks they are a PITA to replace. I used a NAPA torque converter with stock stall speed of 1400 rpm. http://www.jegs.com/i/Mr-Gasket/720/...rentProductId= http://www.jegs.com/i/Mr.+Gasket/720/6716/10002/-1 That "disconnect the vacuum advance" note on that engine by GM is complete nonsense. Disconnect it to set the initial timing -- 16*BTDC worked great for me -- and then connect it back up to manifold vacuum, not "ported" vacuum. http://www.corvetteactioncenter.com/...m-advance.html
__________________
Rich Weyand 1978 K10 RCSB DD. |
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#8 |
Registered User
![]() Join Date: Nov 2013
Location: Ogden, Iowa
Posts: 284
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Re: Crate Motor Install Need help
That "disconnect the vacuum advance" note on that engine by GM is complete nonsense. Disconnect it to set the initial timing -- 16*BTDC worked great for me -- and then connect it back up to manifold vacuum, not "ported" vacuum.
http://www.corvetteactioncenter.com/...m-advance.html[/QUOTE] Thanks Rich, I should also note this is a 4spd truck equipped with an sm465 |
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