Double Hump Heads 327

I was told that all 327's came with the Double Hump Heads, is that true? :confused:

Your heading said 327. If that's the case, no, not all 327's came with double humps. Some came with the same "power pack" heads on 283's, w/ 1.72" int. Worse yet, some came with 1.72" int with the large chambers that were common on the 70's "smog" 350's and 400's. But a good bit of them did get the double humps.

Your heading said 327. If that's the case, no, not all 327's came with double humps. Some came with the same "power pack" heads on 283's, w/ 1.72" int. Worse yet, some came with 1.72" int with the large chambers that were common on the 70's "smog" 350's and 400's. But a good bit of them did get the double humps.

Sorry typing error. Yes its a 327. All I know about this motor its a 60's model and It came out of a Corvette. So I guess its a pretty good chance it has the humps. I'm waiting on my uncle to get the info for me. Or I guess I'lll find out when I get this motor.

why do you want to know. if it is for a resto double humps are ok but for performance they suck... that will piss some old timers off. but not all 327s came with double humps. double humps also came with a variety of cumbustion chamber sizes and valve sizes. very few came with 2.02 valves so be careful

why do you want to know. if it is for a resto double humps are ok but for performance they suck... that will piss some old timers off. but not all 327s came with double humps. double humps also came with a variety of cumbustion chamber sizes and valve sizes. very few came with 2.02 valves so be careful

I'm not going with the double humps anymore, I am going to go with a set of Dart Iron Eagle Platinum heads. From what I have been hearing, these are pretty bad ass!!!

combine the heads with a performer rpm and 650 carb, decent cam you will get a very streetable 400hp

make sure not to get crazy with inake port size.200 cc is pretty large for a 327.that would be for an all out racing ,high rpm motor, but i bet you have a forged crank in that 327, so go ahead and spin it to the moon!i was just reminding you to be conservitive on cam selection and port size because the slightly lower displacement of the 327 will make these things ''act'' bigger.

combine the heads with a performer rpm and 650 carb, decent cam you will get a very streetable 400hp

The motor is bored .030 over and I'm getting the performer intake and carb combo from summit. 650 carb with the air gap intake. The cam I'm undecided. Any suggestions??

make sure not to get crazy with inake port size.200 cc is pretty large for a 327.that would be for an all out racing ,high rpm motor, but i bet you have a forged crank in that 327, so go ahead and spin it to the moon!i was just reminding you to be conservitive on cam selection and port size because the slightly lower displacement of the 327 will make these things ''act'' bigger.

What exactly do you mean "act" bigger. What size do you suggest??
These are the heads SBC CHEVY Dart Iron Eagle Platinum Heads
200cc / 64cc / 2.02/1.60 valve / straight plug. Thanks

what is this going in. car,weight,trans, rear gears,compression(true flat tops or 2 or 4 valve reliefs) i like the 200cc heads because when you do go faster the heads are the most expensive part. what he is talking about is with the larger heads your port velocity will be lower and kill the low end torque with the small cubic inches. it will rev to the moon but be lazy on the bottom end. matching your combo to the car can make this fun to drive...

what is the goal of the car? street or strip or fast street? this could be fun

the carn selection depends on the carb. some of the kits come with the holley 1850 series and they suck for performance.

what is this going in. car,weight,trans, rear gears,compression(true flat tops or 2 or 4 valve reliefs) i like the 200cc heads because when you do go faster the heads are the most expensive part. what he is talking about is with the larger heads your port velocity will be lower and kill the low end torque with the small cubic inches. it will rev to the moon but be lazy on the bottom end. matching your combo to the car can make this fun to drive...

what is the goal of the car? street or strip or fast street? this could be fun

the carn selection depends on the carb. some of the kits come with the holley 1850 series and they suck for performance.

It is going into an 85 Z28. As for the goal, I want a fast street, and not to get blown away if I take it to the strip. It has a 700R4 tranny built with a shift kit, and I'm installing 4:10 rear gears. The intake,& carb are going to be edelbrock.( Performer air gap & 650cfm performer carb) Dart heads 200cc, 64cc with 2.02/1.60 valves. Still undecided about what cam yo get. Any suggestions on the cam? Or cam kit with lifters?

as far as the cam goes the comp xtreme cl12-246-3 it will be very streetable but give a real nice kick. i would also get a 2000-2300 stall converter. it will be easy on the street. go much bigger on the cam and it might be slightly lazy on the bottom end with the larger heads. i would go with 3.73 gears. it will keep the rpms down to around 250 rpm cruising at 60-65 and not overrev the engine on the top end of the track. check the heads i think the springs are a little strong for that cam. if you going with the edelbrock carb you could go with a 750 and not hurt drivability. get a tuning kit it may be a little rich at cruise speeds.

this would be a decent street setup that even your mom could drive. if you wanted a hot street i would go with a 2800 stall and a cl12-254-3 kit. gas mileage and manners may be a little rougher. then you could use the 4.11 gears because you should be at 6500-6800 rpms

go with the performer rpm ari gap not the standard performer air gap. big diff

as far as the cam goes the comp xtreme cl12-246-3 it will be very streetable but give a real nice kick. i would also get a 2000-2300 stall converter. it will be easy on the street. go much bigger on the cam and it might be slightly lazy on the bottom end with the larger heads. i would go with 3.73 gears. it will keep the rpms down to around 250 rpm cruising at 60-65 and not overrev the engine on the top end of the track. check the heads i think the springs are a little strong for that cam. if you going with the edelbrock carb you could go with a 750 and not hurt drivability. get a tuning kit it may be a little rich at cruise speeds.

this would be a decent street setup that even your mom could drive. if you wanted a hot street i would go with a 2800 stall and a cl12-254-3 kit. gas mileage and manners may be a little rougher. then you could use the 4.11 gears because you should be at 6500-6800 rpms

go with the performer rpm ari gap not the standard performer air gap. big diff

I can get a combo from edelbrock Peformer RPM Air-Gap manifold with a thunder series 800cfm carb. Do u think 800cfm is too much?

the good part about the thunder series is they have a lot of adjustments. the edelbrock carbs you can go big and still have the same driveability. i would recommend a tuning kit though it will be a little rich. most quadrajets are 750-800 cfm. the edelbrock is not the best for all out performance but i have ran a 750 edelbrock on a 11 second z. they are one of the easiest bolt and go carbs. that will be a great combo

as far as the cam goes the comp xtreme cl12-246-3 it will be very streetable but give a real nice kick. i would also get a 2000-2300 stall converter. it will be easy on the street. go much bigger on the cam and it might be slightly lazy on the bottom end with the larger heads. i would go with 3.73 gears. it will keep the rpms down to around 250 rpm cruising at 60-65 and not overrev the engine on the top end of the track. check the heads i think the springs are a little strong for that cam. if you going with the edelbrock carb you could go with a 750 and not hurt drivability. get a tuning kit it may be a little rich at cruise speeds.

this would be a decent street setup that even your mom could drive. if you wanted a hot street i would go with a 2800 stall and a cl12-254-3 kit. gas mileage and manners may be a little rougher. then you could use the 4.11 gears because you should be at 6500-6800 rpms

go with the performer rpm ari gap not the standard performer air gap. big diff

This may sound really stupid but will this cam fit any set of heads that I put on? What if I don't go with the 200cc Darts? I'm just getting into all this, so my knowledge of building a motor and trying to modifiy everything is very slim. I would apperiate all the advice I can get. :confused:

the 254 cam is pretty big and would be a decent cam to take advantage of the larger heads. the heads make a big part of a cam selection. list what other heads you like and get some more suggestions. this cam would be way to large for stockers or sr torquers. most of the 200cc heads have rather large valve springs that may be to much.
if you wanted a decent motor on the cheap you could go with patroit performance vortecs. the 246 cam,performer rpm,750 and have acheap street motor

I'm a fan of the old Double Hump heads, but only 2.02's that are worth hanging onto. I happen to have two sets of originals off of 68 and 69 DZ motors. Nice heads, but even the best of them won't match aluminum's. The Darts will clearly make more power and are the way to go in that regard, but the cost will set you way back. On the positive, they will be three angle valves, stainless, and with hardened seat for unleaded gas. You can also run a full point higher on compression with the same octane just by running aluminum heads. Good luck

i have a set of ported 461's ill sell you hehe.

im am almost done building a vortec 355 block with 10:1 pistons, Brodix IK180cc heads, voodoo roller 535/550 lift 231/239 duration 110/106 thats going in my chevelle very soon.

for a 327, i wouldnt go above 190cc. infact, get a set of 180cc heads, and you will be much happier.

aaron

I'm thinking about just using my intake and TPI off my original 305 and putting it on the 327, and modifing the computer to pump more fuel. Will this work?? Any sugestions??

It would choke the engine. 305 TPI intakes have even smaller runners than the 350 TPI intake, it would be a cork holding back your HP.

It would choke the engine. 305 TPI intakes have even smaller runners than the 350 TPI intake, it would be a cork holding back your HP.

But would it a hell of alot faster and more hp than the stock 305?