Ive seen a million 396 build ups on here but not too many 427's what I have is a 454 block that im going to run a 396/427 steel crank in, truck rods w/ARP bolts, pistons are TRW forged #2300 .060 over .180 dome, pistons and rods are balanced, heads are 68 #215 closed chamber stock 2.07/1.72 valves, have both a performer and an RPM intake. Would like to turn motor 5500-5800, will go in 67 chevelle with 4.10 gears auto or 66 chevelle 3.73 4speed. The car now has a 9.5 to 1 396 .030 with crane 222/234 529/525 lift 2200-5200rpm, stock cast holley intake and 650DP (est 350HP). I have the following cams clevite 218/218 516/516 (110)lift 2200-5200, crane 302 fireball 228/228 544/544 (112)lift 2800-5800 and a crower 232/244 561/570 (112)2500-6200. Im not looking to squeeze every last HP outta the motor just a little something more than the 396 (400HP). I have a 10-1 454, #781's 2.19/1.88, solid cam that im putting together next, then a 502 with 177 blower. Im leaning towards the crane fireball because of rpm range but it isnt really much bigger than the crane in the 396 even though the motors 40 more cubes, should I run the bigger crower cam. Has anybody out there ran the fireball?? Would the 650DP be too small for the 427 with the fireball cam?????

I'd run the crower cam with a 750 carb, JMO. Sure would be nice if them heads had 2.19/1.88 valves. A 232/244 cam really ain't much for 427CI IMO.

With 4.10's, definitely run the 232/244 Crower. I just went to a 230/242 Comp Roller in my 408 motor. Unless you come up with some oddball piston for the 427 motor, the CR should be around 10.5+. You will need all the cam you can get to keep it streetable on pump gas.

My 427 was similar in the bottom end as yours. 2238 speed pro piston(11.4:1)/.220 dome?, truck rods(bushed), 2 bolt main, bored .60 over.

I had 049 heads with 2.19/1.88 valves, no port work, RPM intake.

The biggest difference was the cam. It was a custom ground Isky 254°/258° @ .050 .620 with 1.7 rockers and an HP950(stock). It sounds kind of big but with the untouched heads was really done at about 6500rpms(higher than you want). Just thought I'd throw that out for comparison.

It still would run fine on pump gas, but I did run it with C-12 at the track for the reason of being hot lapped in the later rounds. When the engine got warmer it would help avoid detonation since I ran 40° timing in it. No real difference in power with either gas.

If you're going to run a stick, go for the bigger carb.

Rob

RPM intake and that Crower would make that a fun motor

I have that exact same combo, a 454 block, a 396/427 crank, and 215 heads with those same pistons. I ended up using the UD 272/282 Solid flat tappet cam. I am pairing it with a 2400 stall and 3.55 gears though, little more of a street combo.

Daniel

Just found a website that lists the #2300 pistons and with a 101cc head the comp ratio is 10.1 to 1. The heads have been surfaced also, I will have to C.C. the heads to see what they are, compression ratio is getting a little high for 93 octane. I think the crower cam will be the cam and will defintely run the RPM intake with it due to higher RPM range. I have a 800DP that will go good with the combo. I really wanted a little milder motor, but do to comp ratio I think it will need a bigger cam to bleed of compression. I am trying to talk a guy outta a set of #820's C.C. at 111cc but they have the 2.19/1.88 valves installed in them so I would still run the crower cam to make better use of the bigger valves. Maybe I should run my crane solid cam 238/248 567/589 that I was going to run in the 454. Ive just got too many parts around here, endless combinations......

I went with the 272/282 UD Solid cam like i said, which is 238/248 @ .050 with .550/.575 lift. Similar to that crower you talked about.

I personally cc'd my heads using a piece of plexiglass and a graduated cyringe. They camp out to about 103-104 cc's after i had the valves unshrouded. I will come in right below 10:1 with a .039 thick head gasket, like 9.8 or 9.7 i forget, but with the right cam (which it think i have) i should be able to get away with 91 pump gas smile.gif

Daniel