WANTED: 390
Fleet Mechanic
Joined: Nov 2010
Posts: 1,501
Likes: 1
From: Axtell, TX
Sorry can't help ya, but glad to see you're looking to go with an FE! forget those other options. FE all the way, I didn't respond to your other post because I already knew I was too biased. You've already got everything you need to put one in your 78 so there's no way I could've told you 351w or 400. lol
Hope you find one. Are they really that rare around there?
Hope you find one. Are they really that rare around there?
Thread Starter
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Senior User
Joined: Sep 2010
Posts: 258
Likes: 0
From: nicholasville, ky
i found 3 so far in 3 months, one was sitting tore apart for years, the other was smoking, and i dont remember what was wrong with the other one. all going for about 450 bucks. pull a part in louisville had a bunch of them last time i went and i was in the process of pullin one when i seen the price on the website and there was different and i didnt have enough money on me. i might head back up there shortly and look. hope i didnt miss out. they had about 8 of them last time
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Senior User
Joined: Sep 2010
Posts: 258
Likes: 0
From: nicholasville, ky
ok, heres a question...whats the difference in size from a 390 and 410 piston? and if i decide to go that route IF it dont require boring and i use the stock 410 pistons and rods what CR would that be around? i dont want to build a motor that has to run off premium, im not rich haha
Fleet Mechanic
Joined: Nov 2010
Posts: 1,501
Likes: 1
From: Axtell, TX
the difference is in pin height. I'm not exactly sure on the numbers but I'm pretty sure the 410 pistons give you like 8:1 or something close. Not very desireable in a 390. There is a big difference in static compression and dynamic compression. DCR has much more to do with how an engine will actually act. You could have a 10.5:1 run off 87oct with a long duration cam and less timing, and a 8.5:1 ping itself to death with poorly matched parts. It's all about when valves close and open. If you do a search on this forum there are a few threads discussing the piston selection. I believe if you put 360 flat tops in a 390 it will net 9.5:1 SCR. And then you can select a cam that fits that CR.
after rereading your post, are you wanting to stroke it to a 410? or just pistons? if just the pistons you won't need the rods. Just use the 390 rods.
after rereading your post, are you wanting to stroke it to a 410? or just pistons? if just the pistons you won't need the rods. Just use the 390 rods.
