There are tons of correct way to fix the issue . I suppose I need to shut the hell up and listen . Sorry
In all the years I have read stuff on the Hamb, my conclusion is that @squirrel is always right. He thinks before he speaks, unlike so many other people in the world. He also understands internal combustion engines, how they work and how to diagnose them.
Its the hoarder mentality. you have sumthin because you like it. and if you sell it you soon spend the money and don't have the item or the money. Thats how we get to be hoarders.
Right you are, Marty... Sorry 'bout that! My machinist confused me with ".130 over to fit 406 pistons"...Then, further confusion from parts purveyors claiming 428 rings would fit. Thickness of compression ring was different...Kanter came up with a set of Grant for 406. There was other stuff going on then, too... Excuse the mixup, please.
Old Wolf.... that is my exact philosophy! Now I know we’re cousins! I have over 100 things with wheels in my hoard! Bones
I would wager that those exhaust valves are Manley Severe Dutys, they come in the largest size at 2.25 and 1.75 and can be cut down to the smaller sizes. Might want to check the size of those intakes too, they look like the old hollow-stem (without sodium) valves, which were made in 2.19 and also 2.09 for the CJ's. I have the 2.19 hollows and 1.75 Manleys in my old Al Farley C4AE "Big H" heads, as I pulled out the sodium-filled exhausts, and they are so close together it'll make you wince, as the MR, TP and such had wider guide spacing to make room for the bigger valves, and the Big H heads have the stock spacing. They fit fine on a 427, but the big exhaust would not go on a 390. I suspect that someone built the heads for their CJ "back in the day", grenaded the CJ and stuck the heads on the 390. An easy fix would be a set of C4AE-G heads with LR/CJ valves installed, and you basically have a stock LR/CJ head. C6AE-R heads will work too, as will C1's, but the C6's will give you the bosses for 4-bolt exhaust flanges. One thing too, folks get way too fixated on trying to get to 428 bore, and you'll hear many stories about Billy Joe Jim Bob's cousin Darryl who has bored over 250 390's to 428 and they all run 10's with 12:1 pistons, but you are much better off keeping the cylinders thicker and building a 416, .030 over 410 Mercury, which shared the 3.98 crank with the 428, but with the 390/360 bore size- best bang for the buck you can build, and you will never feel the difference between a 416 and a 428. Tip from a little bird, the later pickup 390's used 410 pistons, which were down in the hole for low compression, and +.030 pickup pistons are cheeep- just make sure the compression height is correct. If you pull down most early 70's pickup 390's, the pistons will have "410" cast into them
True, but that wasn't Gene's point. 390 blocks are easy to find, 428 cranks are reasonable (especially with aftermarket options), and 410 pistons are cheap. That is a very cost effective combination to build a long stroke 390 that will effectively sit your ass back in the seat and scare off more then a few small block Chebbie's.
If you step up to an aftermarket crank, sure.... There's several different flavors; stock, internal balance front/external rear, and full internal. If you're willing to spend the money on Mallory metal, even the stock crank can be internally balanced.
Let me think if that has ever been the case around here..........Seems as though it's happened a time or 30.
I have a set of C1 heads with 427 exhaust valves and stock sized intake valves that seem to clear the cylinder walls on my 390 just fine. Haven’t run it yet, still in the build stages. Got the tip out of an old engine building article. SPark
But there are different "427" valves- the LR/ CJ 1.65 exhausts will clear just fine, as will the 2.09 intakes- the subject of this thread has much larger valves. C1 heads also have the LR type ports, I would go ahead and add the 2.09 intakes. Some of the early 60s hipo heads got bigger exhausts with the stock 2.02 intakes, but the next progression was the 2.09s with the 1.65s. That would be a pretty old article lol...
I’ve got one of those 416s in a pickup! Of course I added headers , electronic ignition, 750 vacuum, small cam , 2800 stall and like you said it’s an awesome puller. Bones
Old Wolf, you can buy one or even a 4.25 stroker that need no external balance. But it usually cheaper to find a 428 crank and match it to a 410/428 flywheel. There’s a 428.... stroked to 4.25 in my future......I hope. Bones
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