Stud threads are really not a big issues. Buy a new set of studs for $20, heli-coil or red Loctite in if you have to, cheap fix.
As for any staggering improvements over the stock 390, +10-15 Hp and +15-20 lb-ft of torque for the 428CJs based on dyno pulls on a few engines Jay Brown tested for his FE Intake Comparo book... measureable, but not overwhelmingly significant.
8F01X -EXP500 Repli-bute
Given that modest increase and the head fitting issues I may just drop the whole idea and just go for my first idea from a few months ago and buy a pair of Edelbrock 60065 heads and fit FPA ceramic headers.
By the time I try to tune my "GT" 390 smog heads and muck around fitting CJ exhaust & PI manifolds it seems I'm going to spend a lot of time and a fair bit of $$$ for not that much more HP & TQ and still have a pig heavy front end. As someone pointed out to me on the phone today, the CJ manifolds weren't fitted to 390's as OEM anyway, so it was never going to look STD to even a semi trained eye! Maybe better to go Edelbrock alloy everywhere (heads, manifold & water pump) and still paint it all FORD blue with a new 67 OEM repro open air cleaner and my OEM Autolite Petronix switched and recurved dizzy. That plus the HYD roller cam AND maybe the 431 stroker and it should pull well and still look "pseudo" factory.
So its plan C now....
Thanks for the input everyone. Bloody thing is still on the ship too! Nov 29 they are saying now... GRRRR
Grumpy old git!
Last edited by mungus on Sat Nov 14, 2015 5:09 pm; edited 1 time in total
so it was never going to look STD to even a semi trained eye!
Telling the difference between a 390 block and a 428 when installed and with all the kit on it is not that easy...
What is this?
Can you tell what block is in each car?
But yes, going for the true OEM look is costly. if "Max HP" is your goal, better options.
On the FPAs, they did do better than the 428CJS, about the same bump again over the 390GTs, +20-25ish depending (over the 428s). Hooker Super Comps did very well, but have hear they are a real PITA to install.
Funny that Dynomax FE Truck Headers proved to be far better than most of the others on the dyno.... and cheaper! But sadly don't fit a Mustang....
8F01X -EXP500 Repli-bute
Why don't you use a proper big block ford engine (385 series) like a 460 and then stroke it to 545 cid and have the bees knees. Lots of great heads that flow the kind of air you really need to flow. You can peel the tyres off the rims any time.
I'd like to stick with my 390 block and keep some kind of factory appearance. The idea of running the 67 OEM air cleaner and fitting a Monte Carlo bar is one I've seen in TX and I liked it. Looked very nice and should help a bit.
I'm not chasing huge HP. More a case of looking at the best use of my $ to get a nice streetable 400 odd hp and good torque without making a mess and creating headaches for myself. Mixing and matching 390GT and CJ bits has a few hooks it seems and it all costs $$$, so given that the Edelbrock heads / manifold / water pump etc all save weight as well as adding HP and work together nicely, that may be the logical way to go.
I'll probably still blast, oil and bag all the old OEM bits anyway, just so I've got it all should someone want to go concourse one day.
Anyway at least its given me a decision on the topic of the CJ manifolds. Simply don't want them now!
Would just be an expensive PITA and all compromise with my 390 smog heads it seems.
I am just putting my CJ engine back together now. I went with a set of BBM heads for a bit more. Also fitting a set of Hooker super comps. They tell me they will fit in ok with them bolted to the engine. Will know next weekend all going well!! This is in a 69. got the hookers out of WA from ebay About $750 delivered. Mine will also be stock looking bar the headers
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