Ok as some might have seen in my other post, I'm the proud new owner of a GMC 471 with Cragar V-belt Drive and SBC Wieand Intake. This setup is going into my 52 Chevy build that I was planning on running a 283 in. So now the reason for this post, the 283 block I was planning on using is cracked and not worth fixing. How would the 4-71 work on a 327 30over so 331?, My fear is it would be to small for the motor. Should I just find another 283 to use?
The 4-71 was the blower most commonly used on the street way back when. It is more then enough blower for the average small block.
4 x 71 = 284 cu inches. What's the ratio on your drive setup? Sounds like that little sweetheart would be great, driven 1:1 on your street 327!
Is it just the photo, or is the crank pulley a smaller diameter than the blower pulley? It looks like those underdrive the blower. What are diameters of pulleys?
Ok, combustion chamber size and cam choice plus cubic inches have a direct effect on boost. You are going to be in the 8 to 1 range with your 1 to 1 set up. I'll get my folder out and give you the specs on what I did to my 283 with a similar set up.
I ran that exact set up (471 on a 331 SBC weiand intake but with a 2” Gilmer belt instead of the v belt drive you have) for many years. 6% underdriven sometimes then 6% overdriven at others, it ran pretty good, ran on pump gas, was very streetable and a blast to drive.
That sir is 100% BAD ASS!!!!!!! the fact your auto-crossing that bad boy is just flat out COOL!!!!!!!
Well thits build just keeps getting better, went and picked up the motor and 400 bucks and 2hrs later I'm home. GOTTA love what I found as a head number .
Looks to be a nice 327/275 motor from a full size. Block 3858174 - BLOCK CASTING NUMBER. E206 - BLOCK CASTING DATE F0607HCH - ENGINE ASSEMBLY DATE/SUFFIX CODE Heads 3890462 - HEAD CASTING NUMBER F16 - HEAD CASTING DATE
Those are good heads - they came with either 1.94 or 2.02 valves. You can't tell until you measure them. My 327/275 motor had the 1.94s. Great little engine - be greater with that 4-71!
Hey twisted, it's kind of any running joke around here that "any" 327 came out of a Corvette! With the right components and compression ratio this one should serve you well with that 4-71. Good Luck.
I read that on the internet also ALL 327's listed was from a Vette... If its on the internet it must be true !
It's been apart for sure because the steel shim head gaskets are long gone...But if it's standard bore it's a great find
1-1 set up with 4-71 on 330 cid will be around 5 psi of boost , you will need 850-950 cfm's of carb Draw threw blower Like cfm's , your Boost plus static compression ratio under 13-1 you will be ok on pump 93-94 , Its all in how you tune . No need to O ring (good fepro gasket#1004) might be 400 gasket , but a felpro wire ring Arp bolts or studs nor duble key way , small 327 Balancer hub ,belts will probably slip even with 3 Mild port clean up , those heads are 1.194 Small cam change , About 32-33 total degrees with 15 -23 degres at idle 2-1/2- to 2-3/4 inch exhaust. I have ran 10-5 forged pistons with 8 pounds boots 8mm belt ( no slip ) & No blower hub . Cast crank Over 20,000 miles . On OLD pump formula /blend but not on new blend . 3,200 pound car 107 mph 1/8 @ 6:60 8 inch wide Radial tire 28 tall 3:55 gear 2,200-2,500 stall 6,500rpm's