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Search found 975 matches

by Fatman
Sat Jun 12, 2021 9:51 pm
Forum: Engine Tech
Topic: Pump gas 421 SBC HP
Replies: 37
Views: 1960

Re: Pump gas 421 SBC HP

mt-engines wrote: Mon Jun 07, 2021 12:13 pm Calm down guys.. lol I don't live on here, I have a few more engines to finish up. I will port more details. Head flow, port sizing etc.
Anymore info MT?
by Fatman
Thu Jun 10, 2021 2:28 am
Forum: Engine Tech
Topic: Pick a head, any head.
Replies: 24
Views: 937

Re: Pick a head, any head.

Holding it back in what way? Not enough top end? What rpm does it see and what would you like? what intake manifold and exhaust on it? Carb size?
by Fatman
Mon Jun 07, 2021 7:57 pm
Forum: Engine Tech
Topic: 243 LS SSR...Stumped.
Replies: 31
Views: 1474

Re: 243 LS SSR...Stumped.

"Valve seat is a NWN-4094 (37-45-64) with a 75* leaving .100 wide 64*."
What do you guys think of this valve job? Is the 19 deg transition between 45 seat and 64 bottom cut OK?
by Fatman
Mon Jun 07, 2021 10:17 am
Forum: Engine Tech
Topic: Pump gas 421 SBC HP
Replies: 37
Views: 1960

Re: Pump gas 421 SBC HP

Could we get some clarification on this cam?

Is it a hydraulic flat tappet with 270/275 advertised duration and .460" valve lift?
by Fatman
Mon Apr 05, 2021 7:23 pm
Forum: Engine Tech
Topic: Dart BBC CNC 380's
Replies: 36
Views: 11973

Re: Dart BBC CNC 380's

SupStk wrote: Mon Apr 05, 2021 12:49 pm I dropped the floor to the ssr and blended the transition, effectively lower it somewhat. Doing that you have to constantly flowtest, since it's easy to go too far and lose what was gained.
Did you take a measurement of intake ssr crown height off the deck?
by Fatman
Sun Apr 04, 2021 11:14 pm
Forum: Engine Tech
Topic: Dart BBC CNC 380's
Replies: 36
Views: 11973

Re: Dart BBC CNC 380's

Another zombie thread! Since I was the OP, thought I'd state the finished version on this build. Ended up getting 452 cfm at .900 and eliminated the stagnated areas of flow. The engine made 1084hp. Not quite the 1100 hp goal but the customer seemed happy. Did you go to a 2.350” valve and a steeper ...
by Fatman
Tue Mar 16, 2021 7:07 am
Forum: Engine Tech
Topic: Holley 850...Made in China?
Replies: 59
Views: 4142

Re: Holley 850...Made in China?

Could it be that components are made in China but carb is assembled in USA?
by Fatman
Mon Jan 25, 2021 7:32 pm
Forum: Engine Tech
Topic: First valve job with stones
Replies: 32
Views: 2117

Re: First valve job with stones

Did you cut 50deg seats on those valves? How thick is the valve margin now?
by Fatman
Tue Aug 25, 2020 6:27 am
Forum: Engine Tech
Topic: AFR 245 CNC Heads 2.125/1.600 Valves 763 HP
Replies: 17
Views: 1094

Re: AFR 245 CNC Heads 2.125/1.600 Valves 763 HP

Awesome info Larry Are you able to add what FPS reading your Dart pro 1 245cc port has on the floor at ST I have built a few 434” engines with out of box AFR245 heads they look good on dyno with 600ft lb and around 730-750hp. But none of them have shown any good track results they all Seem to lack ...
by Fatman
Mon Aug 24, 2020 3:38 am
Forum: Engine Tech
Topic: AFR 245 CNC Heads 2.125/1.600 Valves 763 HP
Replies: 17
Views: 1094

Re: AFR 245 CNC Heads 2.125/1.600 Valves 763 HP

Awesome info Larry Are you able to add what FPS reading your Dart pro 1 245cc port has on the floor at ST I have built a few 434” engines with out of box AFR245 heads they look good on dyno with 600ft lb and around 730-750hp. But none of them have shown any good track results they all Seem to lack ...
by Fatman
Mon Aug 24, 2020 2:07 am
Forum: Engine Tech
Topic: AFR 245 CNC Heads 2.125/1.600 Valves 763 HP
Replies: 17
Views: 1094

Re: AFR 245 CNC Heads 2.125/1.600 Valves 763 HP

Awesome info Larry Are you able to add what FPS reading your Dart pro 1 245cc port has on the floor at ST I have built a few 434” engines with out of box AFR245 heads they look good on dyno with 600ft lb and around 730-750hp. But none of them have shown any good track results they all Seem to lack ...
by Fatman
Sun Aug 23, 2020 5:00 am
Forum: Engine Tech
Topic: 1 5/8” headers and 500hp?
Replies: 75
Views: 4799

Re: 1 5/8” headers and 500hp?

Fatman : Why do you think this would have made less if you used a 3 or 3.5" collector instead of the 4"? mainly 3 reasons : [1]= because it lost so much HP with 1 5/8ths Headers ( Lost= 58.0 HP to 61.8 HP ) ... these were pretty nice straight tubes for very long distance and they killed a bunch of ...
by Fatman
Sun Aug 23, 2020 4:17 am
Forum: Engine Tech
Topic: 423 SBC combo help
Replies: 85
Views: 3313

Re: 423 SBC combo help

Fatman : Did the heads tested on the 4" bore have a 4" chamber or bigger? How do you think they would have gone on a 4.125-4.155 fixture? i used a 4.000 Bore Flow fixture because he used a 4.000" Bore Block for this Engine , i can't remember his reason why ??, this is very rare to do this ! but fro...
by Fatman
Sun Aug 23, 2020 1:10 am
Forum: Engine Tech
Topic: 423 SBC combo help
Replies: 85
Views: 3313

Re: 423 SBC combo help

AFR 227CC CNC'd out-of-box-shape Port Specs : Intake Port CenterLine Length = 5.488 Exhaust Port CenterLine Length= 2.888 Flow Tests from 3 different pairs of AFR 227CC 1 Pair Ported to 231.0 CC Intake Ports Flow tested on 4.000 Bore Fixture Angle-milled + straight cut other 2 Pairs, Flow tested on...
by Fatman
Sat Aug 22, 2020 11:31 pm
Forum: Engine Tech
Topic: 1 5/8” headers and 500hp?
Replies: 75
Views: 4799

Re: 1 5/8” headers and 500hp?

Danny Durand sold his SBC442cid 815.8 HP @ 8200-8300 RPM to this Guy to upgrade to 470cid SBC ... which Danny then made 951.5 Peak HP @ 7700 RPM 702.5 TQ @ 6600 RPM Customer wanted a strong "Pump Gas" Street Engine ... so that was main reason of "radical detune" Customer put the SBC442cid into a 19...