I want my engine to pump out 470 HP at the flywheel. I want a motor that is streetable and idles decently. To accomplish this, I'm thinking about going with the following things: 302 ci Mexican Block (thicker main webs, etc) possible 4-bolt main bearing upgrade by machine shop Stroker kit for 331, 347, or 355 ci Victor Jr. Heads Victor Jr. Intake 10.0:1 Compression Holley 600-700 cfm four barrel Roller cam with dual timing chain I'm not sure about what cam I want to run with this, and I'm not sure whether I want mechanical or vaccum secondaries on my carb, if anyone knows the benefits of each I'd be glad to find out . I'd also be interested in hearing what you guys have to say about Victor Jr. Heads and intake on street applications. I've heard that Victor Jr's produce a pretty rough idle due to the single plane intake manifold and huge ports on the heads. Do you think I should go with a dual plane intake even though it doesn't flow as well? What heads would get me to the HP that I want, yet still keep it streetable?
This months issue of MM & FF did a head comparison (just about any head you can think of) on a 306 (i think?) and the AFR 165's produced more H.P then any others, it almost reached 400. I think the concensus is on the AFR. They are on top of there game right now.
A 268 Comp Cam is fairly descent on idle and power if you are going to be on the road. Definetly manual secondary for carb. It dosen't take a minute to go when you put your foot to the floor. Go with a Holly 600, thats all you need.
. I know that mechanical secondaries are faster, but aren't vacuum secondaries better? I think vacuum secondaries only open up wheh you need the extra fuel, as opposed to mechanical secondaries which may open up too soon and provide too much fuel, which would cost you power. Am I right?
Re What does idle decent meant to you. Its going to take some cam to get 470 hp. I myself love the victor jr heads, my buddy has them on a 302 with a 248/ 254 solid roller and victor jr intake. But the AFR 185 are right there also, either will get the job done. I would run the comp cams xr280r its 242/248@ 50 .608 .614 lift its should idle decent lol in a 347. Roller cams idle better than flat tappet cams. I would run a 750 vac carb on it. I ran one on a 406 that ran 10.50s at 130 There are so easy to tune compared to a bouble pumper. My friends 302 doesnt seem to lose much low in end with the victor jr heads on his 302 he leaves everyone off the line.
. That's good to hear. The only thing that scares me about the Victor Jr. heads is what I've heard about the low-end and idle. I may go with the AFR heads after all because they flow well at upper RPM's and flow a little better at lower RPM's if I remember correctly. They're doing a big head article in MMFF right now as someone said earlier, pretty interesting stuff. How high does your buddy with the Vic. Jr. rev his engine, and does he launch at 3000 or something lol?
RE He has a 3500 stall. He shifts at 7500 to 8000 LOL. 4.88 gears a 347 would bring the rpms way down.
chech this out Maybe this can help, http://www.edelbrock.com/automotive/headford.html If anyone has tried this heads please let Us know. Thanks Sccopy
Heads The elelbrock rpm heads are not to bad, but i would buy Trick flow tw, AFR 165 or 185s before i bought them.
Do you have the Mexican block, or your planning on getting it. If you need any help let me know, I live in Mexico.
. I don't have the Mexican block yet. It's all just a plan right now . If you could help me locate one in good shape for a reasonable price, I'd be very interested. I'd want one preferably that hasn't been rebuilt and hasn't been overheated, with no cracks anywhere, etc. Are there lots of 302 Mexican Blocks down there, I've heard they're great blocks but I haven't heard how they're distributed or why they're made in Mexico. I don't think there is such a thing as a 4 bolt Mexican block, but have you seen any of those? As far as the Vic Jr. stuff, yeah that's what i figured. THe power band on those suckers is about 3500 all the way up to as high as you can rev, the higher the better. So it sounds like an automatic would be a hell of a way to go with that setup. With a t-5 it might be a little more tricky though.
Give me a couple of days, I might be able to quote you a BRAND NEW Block. No, there are no 4 bolt blocks in Mexico I'll be in touch
