Quote:
Originally Posted by Mrturner1
I've tried Home Depot, Riebes auto, Napa, and Harbor Frieght and nobody has a thread chaser. Would a clean head bolt with some brake cleaner do the same job?
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Just use a tap like stated before, a
7/16"-14 thread tap. I just saw this thread and read thru the whole thing. I see youre in Colfax, I have a very good friend that lives there, builds boat motors. Looks like you have been to Tognottis for your parts too, the guys there are very smart and helpful. Ask all the questions of them you need.
I have a couple questions - Did you verify what the SBC heads you already had on the motor were? springs? valves? specs etc? It looks like the PO went to a pretty good effort on the rebuild using a LUNATI cam, thats not cheap stuff, already had a double roller timing chain thats probably good, does the chain feel loose? Your heads, springs, valves were probably sufficient for the cam that he already went through the process of 'building'. Do the heads look like any porting was done or any work on them at all? Maybe they are shaved? to get more compression? did you check the deck measurement or ask the PO?
Also with the PO going .040 over on the pistons, shows he wanted something a little more than most. The pistons are flat tops but 'doming' them is not the only way to get compression ratio changes. There are many things to check when you start decking heads and such, you have to figure gasket quench thickness, chamber volumes, piston deck clearances and many others. it really is 'rocket' science if you want it right and want it to go fast.
The air gap manifold will be a good upgrade as will the new carb. I dont get the 50F number mentioned, as you want manifold temps to be AS COOL AS POSSIBLE, thats why intercoolers are used on blowers to make them even COLDER. Theres been alot of input here for you to take in. Just beware that there is A LOT of information out there.
I didnt see in any of your first posts as to why you wanted to make alot of these changes to the motor? Did you have any baseline of information on its performance other than it has a 'lumpy idle'.... you may be going backwards in your enhancements if you dont know where you started. Does that make sense?
Chances are if the PO knew what he was doing and there isnt many miles on that motor, you are doing alot of work for nothing at this point. just saying.... please dont take any of this wrong.
Try and get a 'build sheet' from the PO if you can... you might be pleasantly surprised at whats in your motor.