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09-02-2013, 12:35 PM
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#1 |
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Registered User
Join Date: May 2011
Location: Lexington, NC
Posts: 157
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1985 305 vs. 1986 305
Besides the 1 piece real seal, the center bolt valve covers, and the different bolt angle on the intake, is there any other differences between the '85 305, and the '86 305?
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'85 SWB Silverado |
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09-02-2013, 12:53 PM
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#2 |
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Registered User
Join Date: Aug 2005
Location: Louisiana
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Re: 1985 305 vs. 1986 305
86 should have the 1 pc rear main seal but the same perimeter valve cover as the 85. Intake bolt pattern the same also.
87 is when the change to centerbolt covers. |
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09-02-2013, 01:07 PM
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#3 |
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Location: Lexington, NC
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Re: 1985 305 vs. 1986 305
 The guy says it's an 86, out of a Camaro. But it has the center bolt heads, and what appears to be the old style intake bolt angle. Whether it's an 86 or 87, is the cam the same between 85, 86 and 87? That is, if the 87 is not a roller cam. Last edited by jimboh247; 09-02-2013 at 01:22 PM. Reason: stupid picture |
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09-02-2013, 01:18 PM
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#4 |
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Location: washington
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Re: 1985 305 vs. 1986 305
Depends on what 305 we are talking about. The truck 305 or passenger car 305
Posted via Mobile Device
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09-04-2013, 07:36 PM
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#5 |
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Location: Lexington, NC
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Re: 1985 305 vs. 1986 305
Well, I pulled the intake, and it is at least an 87, due to the roller cam.
What I want to know: Will 85 or earlier heads bolt on to the 87 block if I use the earlier intake? Can I ditch the roller cam and go with a cam from an earlier (non-roller) motor? All I really need is the short block.
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09-04-2013, 08:45 PM
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#6 |
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Join Date: Aug 2005
Location: Louisiana
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Re: 1985 305 vs. 1986 305
Yes to all your questions. I would take advantage of that roller ready block,myself
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09-04-2013, 09:18 PM
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#7 |
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Join Date: Apr 2012
Location: Murphy,NC
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Re: 1985 305 vs. 1986 305
You'll have to use the 86-up one piece rear main flywheel/flexplate. I agree with Jake, I would use the roller setup. Free upgrade.
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09-04-2013, 10:24 PM
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#8 | |
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Location: Lexington, NC
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Re: 1985 305 vs. 1986 305
Quote:
I have a new flat tappet cam, but I guess I could sell it and get a roller cam. I'm going to pull the heads and oil pan to check everything inside out.
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09-06-2013, 09:59 AM
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#9 |
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Location: Lexington, NC
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Re: 1985 305 vs. 1986 305
Another question:
Does the factory cam use a different cam gear on the distributor?
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09-06-2013, 03:07 PM
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#10 | |
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Location: washington
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Re: 1985 305 vs. 1986 305
Quote:
Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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