moderate 390 build advice
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moderate 390 build advice
Hi, I'm doing an install on my 67 390 this weekend and just wanted to see what you experts think. I'm installing a Edlebrock RPM intake, comp roller cam 270/276 (kit), new valve train, edlebrock 4bbl 650 thunder series carb, msd dist, new high flow air intake, sanderson ff427-bec shorty headers, 3" flowmaster exhaust.
This will be on an otherwise stock 390. I was going to go a bit bigger on the cam, but wanted low rpm response and did not want to mess with a stall or tranny at this point. This is all with a C6 auto trans. This is in my 56 f100. Will be adding other non engine goodies too (disc / power brakes, new wood in bed).
What do you guys thing I can expect from this? FYI: this will be for a weekend warrior truck.
Does this sound like a decent build? Should I change anything that sounds way off?
This will be on an otherwise stock 390. I was going to go a bit bigger on the cam, but wanted low rpm response and did not want to mess with a stall or tranny at this point. This is all with a C6 auto trans. This is in my 56 f100. Will be adding other non engine goodies too (disc / power brakes, new wood in bed).
What do you guys thing I can expect from this? FYI: this will be for a weekend warrior truck.
Does this sound like a decent build? Should I change anything that sounds way off?
Hotshot
Joined: Jul 2005
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From: Middle Tn.
Personally I'd got with the Holley street Avenger 770 cfm electric choke. Has worked extremely well on my 428 cj. Much better than the stock 735 cfm carb. Aside from idle adjustment it was install and go.
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I was on the fence between Holley and Ebrock. I was also undecided on size and figured for my build anything over 650cfm would be a waste. I went with ebrock for the secondary adjustment and the fact that the person doing the install with me has and likes that carb.
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Well it's a 1967 4v which was 10:5:1. Don't know exactly what it came out of, but according to the codes it was made it 67. But I have not pulled the heads to confirm the cr.
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Hotshot
Joined: Jul 2005
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From: Middle Tn.
10:5 to 1 will more than likely require premium fuel to get the max out of your timing. My 428 cj is 10:6 to 1 and requires premium unless I severely retard the timing which defeats the purpose of a high compression street engine.
Post Fiend
Joined: Apr 2008
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From: Big Sky Country
I would of confirmed the C/R before purchasing a cam...
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Joined: Apr 2004
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'67 4v would be 10.5. 2bbl motors were 9.5. This assumes it was a 4v motor as OEM.
FE Series Engine Specification Chart
FE Series Engine Specification Chart
Hotshot
Joined: May 2003
Posts: 11,141
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From: south louisiana
With that cam it'll probably do OK running 89 with 12* initial timing. Might even work with 87. I would try it first on 89, then see if it pings or not. If not, feed it some 87 and see how it goes. Don't understand the thing about the adjustable secondaries on the E'brock carb, Holley's are every bit as adjustable there as well. With the RPM, you'll need to pull the intake locating pin out of the block, then set your gaskets up, then set the intake in place. Then before bolting it down, stab the distributor, get it seated all the way in, then torque the intake down.
Post Fiend
Joined: Apr 2008
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From: Big Sky Country
'67 4v would be 10.5. 2bbl motors were 9.5. This assumes it was a 4v motor as OEM.
FE Series Engine Specification Chart
FE Series Engine Specification Chart
Post Fiend
Joined: Apr 2008
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From: Big Sky Country
Nor do I, that's because one didn't exist. 
I never mentioned 4v in my post, the OP did...
After five decades any intake could be on his 390, hence my recommendation to check the C/R
I never mentioned 4v in my post, the OP did...
After five decades any intake could be on his 390, hence my recommendation to check the C/R