351w Tuning Troubles
#2
Well lets see, it's got a 10.7 to 1 comp ratio. As such the cam's a bit small and the LSA is a bit wide, but it should run on 93 pump premium if it's timed correctly. My 331 runs on 93 with a 10.4 to 1 ratio and a 112" LSA Z303 cam with 12* initial timing. Sounds to me like you need to go back to the basics with it. Also probably need to work with the MSD system to dial in the timing curve. As to how that's done I can't tell you, I'm no fan of MSD anything. The 650 is also too small for it, that's probably why it's running way rich. A 3310 Holley 750 would be a better match.(no fan of Edelbrock carbs either) Thicker head gaskets will only exascerbate the detonation issue. I'd back off on the timing advance first and tune the carb to the motor, and see if that helps before doing anything else.
#4
#5
I run stock Ford distributors, either a stock Duraspark or a points distributor fitted with an electronic module like a Pertronix. The smaller carb "sees" a high vacuum, thus exerts a stronger pull of the fuel from the bowls. It could have other problems as well causing it to run rich. You need someone there who knows how to sort things out.
#7
You need to spend some quality time tuning it(ignition and carb). The comp ratio isn't what I'd pick for a 4x4 either, but it should run on pump premium if tuned right. It would even run on less octane if you went bigger on the cam, you might loose some bottomend (you never did say what intake was on it) but you could get some of that back by running a small carb, like a 570 Holley.
Trending Topics
Thread
Thread Starter
Forum
Replies
Last Post
acnels
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
1
03-14-2008 05:08 PM
smallblock351w
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
14
04-07-2006 07:27 AM
gtex
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
22
08-10-2005 09:53 AM
superhooperduty
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
1
01-05-2005 11:36 PM