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GMC V6 and V12 Engines Engine repair and rebuilding |
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#11
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Re: 305e Holley 500 swap question
Quote:
Quote:
https://www.holley.com/products/fuel...age/parts/9678 THROTTLE RETURN SPRING KIT Fits Holley PART# 9678
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Jerr 1963 305 V6 1500 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#12
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Re: 305e Holley 500 swap question
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Also does everyone just bolt it on and forget it, or do you modify the intake at all so it flows better?
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Jerr 1963 305 V6 1500 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#13
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Re: 305e Holley 500 swap question
Personally I would make the everything (adapter and manifold) opening the same side as the carburetor throttle bores. I would also radius the lower edge of the manifold as it make the turn toward the runners. This is what I am planning on doing when I get around to do it (to many chores getting in my way).
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#14
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Re: 305e Holley 500 swap question
Yes when I had the 305 in my 68 I opened up the intake at the base to match the larger throttle bore of the Holley 500
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#15
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Re: 305e Holley 500 swap question
Any idea of what headers to use with a 400sbc in my 60 gmc? Huggers headers? It has rams horn oem manifolds and straight spark plugs. Thanks, Joe.
Sent from my SM-T560NU using Tapatalk |
#16
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Re: 305e Holley 500 swap question
this is the V6/V12 section of the site.
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Jerr 1963 305 V6 1500 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#17
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Re: 305e Holley 500 swap question
Quote:
Quote:
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Jerr 1963 305 V6 1500 To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts. |
#18
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Re: 305e Holley 500 swap question
I didn't make any changes to the manifold. Seemed like I needed to rebuild the original carburetor (again), so it was a good time to try the Holley 500. I just bolted it over the adapter. Truck runs fine (better), just a little rich. I have smaller jets, but haven't installed them yet. Except for choke, conversion on my '64 305E was easier than a rebuild. The truck starts easier, which is good for the starter and battery, runs rough until it warms up (probably an adjustment issue), then runs better and with more power - especially at the top end. My main concern is potential to over rev the engine while trying to keep up with freeway traffic, which I have mostly solved with taller tires and 3.54 rear end - and trying to keep in mind that these trucks were not designed to go or stop as fast as modern vehicles. One thing to watch out for is that a backfire can pop off the vacuum port plug at the rear of the carburetor. This causes truck to die at idle and run only at higher rpms.
JRMunn |
#19
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Re: 305e Holley 500 swap question
When I did my swap, I just bolted the adapter on and installed the carburetor. made the linkage work, moved the choke to the right side and I was off. Truck starts easier, runs smoother and best of all the carb is jettable if need be. I went from 1 size smaller jet, back to stock as my mileage went down after going smaller.
+1 on the vacuum port plugs, seems most issues I have had with swap deal with the port plugs disintegrating and allowing air into process. If your mileage or performance takes a sudden dump check them first. |
#20
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Re: 305e Holley 500 swap question
Don't think you'll have any problems at, for instance the Magnum Trapezoid base manifolds have a considerably larger opening than the WWC carbs throttle bores.
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