Post by Pontiac1976 on Sept 6, 2007 15:24:35 GMT -5
Well it mostly depends on how much money you want to spend, what numbers the head will work best for your set up ( the parts your using ) what # the head can work IE compression cc, spark plug set up, port maximum , if your buying head set up or bear . What you have to have or need as on cc IE. 76cc to keep compression down a little because you have really high piston compression say. So you have to see what size port your Intake will be running 200- up then pick all the head in the same size port runners 200,205,215,220,230,I think there one or to 250 . do you know what type Cam you want to run three types SOLID, ROLLER, HYDRAULIC ,HYDRAULIC ROLLER . What type motor SBC/ BBC you want to build. once you have en-idea then star to com-par the heads in that range then it's up to money what brands you like. ** Remember all the part you get should help each other work well to together if not the set up will not work as it should.
77 1/2 ton Heavy Half chev 454,350TH,3.07rear driven 6 YR now changed back to 85 monte carlo SS 305 Motor as of 2004, june,30 inter changed to 84 GMC style, flatbed with a 98 van bumper.
Post by bowtiefreak383 on Sept 10, 2007 11:27:24 GMT -5
Well, seeing how this truck is my toy, it's going to be on the ragged edge of streetability. If the funds were there, I would just do a big block with a turbo, but I gotta be realistic. I was wanting to do an LS1 conversion, but I can't find any deals that are reasonable. Anywhere from $2500-$5000 plus outrageous shipping. So I'm gonna stick with the 'ol 4-bolt.
Working with a SBC, currently with the factory TBI, TBI spacer, a stage ll Jet chip, full exhaust, small stall(2500), gears, posi, and other misc.
Basically, I'm ready to get serious with it. I've always had something that was mild(300-350hp), but I want something that will really just blow the tires off when I want to.
I'm looking at AFR's Competition aluminum heads(210cc). If I'm using the compression ratio equation correctly, this head should give me close to 10:1 compression. These heads are supposed to flow about 285cfm intake and 218cfm exhaust and are CNC'd by AFR.
The cam is gonna be big, Looking at Comp's "XFI" hydraulic roller with 292/300 duration, .584/.579 lift, and 113 lobe seperation. But I don't know if this will work with the TBI, or if extensive computer tuning would be needed. If it's too much trouble, I'll probably end up going with aftermarket fuel injection(Edelbrock).
I am currently running Dynomax's Cyclone headers with the Jet-Hot coating, but they are the standard 1-5/8" primary into 3" collector, and will probably need to upgrade to 1-7/8" primaries.
Post by reiners81chevy on Sept 10, 2007 22:33:17 GMT -5
I would conisder going with forged bottom end and then the heads. That way you pretty much bullet proof the bottom of the motor. I would also consider going with a bigger throttle body as well. I have a TPI setup off of a IROC Camaro that me and my dad are going to put on his 83 shortbed. we plan on going with a BIG Cam and bigger injectors, also with high compression pistons, and even some spray if I can talk him into it. lol. You can always find some one to build a ECM for whatever you have. It may be a little expensive but it'll work properly. And you wont have to worry about doing it yourself. Unless you know how it works.
Post by BowtieGuy on Sept 11, 2007 17:16:59 GMT -5
That sounds like a good set up in my opinion, if you were running a smaller cam I would go with smaller runner heads though. The smaller the runners (210cc versus 180cc) the more street manners you will have and more bottom end torque you can build. I would chunk the TBI set up with what you listed though and go with an aftermarket injection system. AFR have some of the best heads on the market as far as alum. heads go. And if memory serves me correctly you can run up to 10.5:1 compression with alum. heads and still uses pump gas with no additives. You will have to use premium though. 9.7:1 I think is max for iron heads. If I am wrong someone please correct me.
[glow=blue,1,300][shadow=green,left,150] 86 1/2 ton 2wd Parts house replacement 350 Several performance parts added Performance built 700r4 4.11 gears with a true locker[/shadow][/glow]
Post by bowtiefreak383 on Sept 15, 2007 21:25:07 GMT -5
Thanks for the input, guys.
I've been doing a little R&D on TBI performance, and although you can peak a little over 400hp with everything else maxed out, it looks like I would definitely have to have my Prom custom-burned. With these older computer-controlled systems having so few data inputs compared to OBD-ll and aftermarket systems, even a custom tune doesn't always work real well. And besides, I'm looking for a lot more than 400hp ;D
Actually, those AFR Competition 210cc's flow well over 300cfm on intake (315-318cfm). That really would let the motor breathe deeply. Most engine builders I've talked to say that the heads are where the power is made.
You can go to 11.0:1 compression with aluminum heads and pump gas. My old man has a '96 Impala, 383 stroker, worked-over aluminum heads from a '96 camaro, that puts out ~425hp, and passes inspection! The engine builder really knows his stuff, his name is Ray Little, and his business is 'RayMac Racing Engines'. Also built an LS1 for my buddy, on pump gas dyno'd at 515hp!