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Search found 4494 matches

by Carnut1
Tue Oct 15, 2019 10:51 am
Forum: Engine Tech
Topic: Re-drilling 72 degree angle sbc heads.
Replies: 11
Views: 494

Re: Re-drilling 72 degree angle sbc heads.

I believe the 217 is about the same as 083 casting. They cam be made to work with some porting. Very good street performance head.
by Carnut1
Mon Oct 14, 2019 6:52 pm
Forum: Engine Tech
Topic: L48 Project: Ported Chevy 450 heads vs. Bowtie vortec heads
Replies: 161
Views: 12925

Re: L48 Project: Ported Chevy 450 heads vs. Bowtie vortec heads

ok,, you asked for a comparison to see how you did. its not good. from 2500 thru 5700 you were down about 161 points compared to the olds if scored by EMC. the olds heads flowed 220/160. these same heads on an 11.4 :1 set up made 504/454 Ford 306 9 to 1 comp, thick head gaskets, 204, 204, .472, .47...
by Carnut1
Mon Oct 14, 2019 4:15 pm
Forum: Engine Tech
Topic: L48 Project: Ported Chevy 450 heads vs. Bowtie vortec heads
Replies: 161
Views: 12925

Re: L48 Project: Ported Chevy 450 heads vs. Bowtie vortec heads

ok,, you asked for a comparison to see how you did. its not good. from 2500 thru 5700 you were down about 161 points compared to the olds if scored by EMC. the olds heads flowed 220/160. these same heads on an 11.4 :1 set up made 504/454 Ford 306 9 to 1 comp, thick head gaskets, 204, 204, .472, .47...
by Carnut1
Mon Oct 14, 2019 6:54 am
Forum: Engine Tech
Topic: 706 LS heads - how'd I do?
Replies: 12
Views: 606

Re: 706 LS heads - how'd I do?

Resized_20190814_183752_9329.jpeg LS cathedral ports are an interesting design. Seems to me most guys just make them big and they flow well. I am working on a cathedral port aftermarket head and Holley manifold combo. 2.02" 1.6" 220cc runner and a little over 300 cfm @ .7" through the carb all bolt...
by Carnut1
Sun Oct 13, 2019 7:31 pm
Forum: Engine Tech
Topic: Intake manifold CSA
Replies: 8
Views: 501

Re: Intake manifold CSA

Resized952018102895191809954382 (1).jpg
Did you use a radius or bellmouth inside the plenum?
by Carnut1
Sun Oct 13, 2019 5:18 am
Forum: Engine Tech
Topic: 305 head flow possibilities?
Replies: 14
Views: 675

Re: 305 head flow possibilities?

https://www.google.com/url?sa=t&source= ... N0GmLIsIlk
An older thread I did on 450 castings.
by Carnut1
Sun Oct 13, 2019 5:16 am
Forum: Engine Tech
Topic: 305 head flow possibilities?
Replies: 14
Views: 675

Re: 305 head flow possibilities?

The ports are the same for 1.72" and 1.84" valve heads. Be sure these castings are not cracked! They are thin walled castings but can flow fairly well if ported.
by Carnut1
Sat Oct 12, 2019 4:14 pm
Forum: Engine Tech
Topic: rocker stud breaking
Replies: 10
Views: 587

Re: rocker stud breaking

Belgian1979 wrote:
Sat Oct 12, 2019 3:36 pm
That was my first guess, so I told him to keep the rpms within reason...
The problem with spring surge or float is it overheats the springs very fast. Once they heat they lose load and then surge or float even easier. Testing those springs is probably a good idea. Thanks, Charlie
by Carnut1
Sat Oct 12, 2019 3:18 pm
Forum: Engine Tech
Topic: rocker stud breaking
Replies: 10
Views: 587

Re: rocker stud breaking

Early 90's I did not know what a redline was so I broke plenty of studs before I realized I was asking too much from the valve springs and was going into surge and at times float. When the spring finally catches up the forces go through the roof.
by Carnut1
Thu Oct 10, 2019 12:31 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2415

Re: EMC 289

Those two sets of 289 heads are still at Terry Walters shop awaiting DV to dyno test them. Obviously not at the top of his to do list. You could/should test them yourself///that way you know////a 289 or 302 shortblock could be done for a reasonable amount I would think/////you could probably tool o...
by Carnut1
Thu Oct 10, 2019 12:14 pm
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2415

Re: EMC 289

Then why not build one? :D//////Better get busy!!! You already have the heads mastered right???////// :D Elroy, if you had read my 289 head thread you would know that Bill C bailed me out and sent me one of his cnc heads after I made a sprinkler out of one. For doing me this huge favor he wanted a ...
by Carnut1
Thu Oct 10, 2019 11:59 am
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2415

Re: EMC 289

Those are real world flow numbers with serious work. I just want to see what this mill would do with a tunnel ram and dual fours. Love this build! Then why not build one? :D//////Better get busy!!! You already have the heads mastered right???////// :D Elroy, if you had read my 289 head thread you w...
by Carnut1
Thu Oct 10, 2019 6:14 am
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2415

Re: EMC 289

The heads flowed 235 cfm @600 and 190 exhaust@.600. These heads still have good port wall thickness. You could find a little more out of them but run the risk of having something unreliable. You don't have put a ton of thought into it to realize that with 12.5 or 13.0:1 compression and a taste more...
by Carnut1
Wed Oct 09, 2019 7:58 am
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2415

Re: EMC 289

Bill C 289 cnc.jpg
Intake bowl of Bill C cnc work. From my old 289 thread. Bill C has these down.
by Carnut1
Wed Oct 09, 2019 6:34 am
Forum: Engine Tech
Topic: EMC 289
Replies: 63
Views: 2415

Re: EMC 289

20170629_211650.jpg So glad you are sharing with this build. I agree that Bill C 289 cnc is a great starting point. He bailed me out a while ago when I ruined a head for DV. This is a pic of the exhaust. I also agree that the exhaust on these heads work better with a smaller bowl so that flatter ex...